Contact Us
(303) 833-4715
Contact Us
(303) 833-4715

Northern Denver & Front Range's Premier Design-Build Firm

Additions and ADUs in Thornton, CO

Where Your Family Finds Room to Breathe Again

Start Planning Your Project

Why Thornton Homeowners Choose Christie's

Because the Ranch That Raised Your Family
Has Room to Grow With the Next Chapter

For more than 25 years, Christie’s has helped Thornton homeowners solve the real problem, a ranch that was built for one generation and is now being asked to hold two or three. A parent whose knees won’t do stairs anymore, finally given a ground-floor in-law suite with a no-step entry and a bathroom they can actually use safely. An adult child back home who needs genuine independence, not just a bedroom down the hall.

At Christie’s Design/Build Remodeling, we start by being honest about what your Thornton home will actually need, because older ranch stock here often carries a 100-amp panel, original HVAC, and plumbing that wasn’t designed for a second unit, and we’d rather name those things in pre-construction than hand you a change order mid-build. From established neighborhoods near Thornton Town Center to newer HOA-governed subdivisions in the north, we plan every addition and ADU around the home you already own and the family you’re building it for.

In Business

25+ Years

Helping Thornton homeowners add real, independent living space to aging ranch homes, built around your family's needs, your lot, and your HOA's requirements.

Our Model

One Team

Your Thornton addition or ADU is held by one coordinated team from pre-construction assessment and design through permitting, HOA review, and final walkthrough.

Where We Work

Thornton, CO

Serving homeowners throughout Parterre, Wyndemere, Thornton Town Center, North Thornton, and established neighborhoods across Thornton.

Peace Of Mind

5-Year Warranty

Your new Thornton addition or ADU stays protected once construction is complete, so you can settle into the space with full confidence.

What Makes Additions & ADUs Different In Thornton

When You Build It Right,
It Feels Like It Was Always There

Adding onto a Thornton home means starting with a very specific set of conditions, a production ranch that’s served your family well but was sized for one generation, a 100-amp electrical panel that can’t support a secondary unit, and original HVAC that was never meant to reach a new addition or detached ADU. Newer homes in the northern subdivisions come in better mechanically, but they bring a parallel challenge: HOA design review that operates on its own timeline alongside city permitting, with real authority over exterior materials, roofline compatibility, and landscaping restoration. At Christie’s Design Build, we work through all of it before design is finalized, utility feasibility, structural conditions, lot setbacks, and HOA covenant exposure, so the number you’re looking at reflects the actual project. The goal is an addition or ADU in Thornton, CO that fits your family’s life right now and holds up as something your home was always meant to have.

.01

Thornton Ranches Have Real Opportunity

Thornton’s 1970s–2000s ranches, tri-levels, and attached garages each open up different paths for added living space. We study your structure and lot first so the right direction is clear before design begins.

.02

Thornton's Ranch Stock Sets the Rules

Thornton’s 1970s–2000s production ranches carry specific framing conditions, rooflines, and load paths worth understanding early. Reading those first means your addition ties in naturally and performs as one home.

.03

Thornton's 100-Amp Panels Need Honest Assessment

Thornton’s older ranches routinely carry undersized panels and HVAC that can’t reach a new unit. Finding that during planning keeps your project on track and your budget honest.

.04

Thornton's Climate Shapes Every Exterior Decision

Thornton’s freeze-thaw cycles, summer hail, and wide temperature swings put real pressure on exterior materials, insulation, and roofing, especially where new construction meets original framing. We plan those details carefully so your new space stays comfortable and holds up through every season.
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Thornton, CO Neighborhoods

More Room Without Leaving
the Thornton Your Family Has Grown Into

Thornton is full of ranch homes and tri-levels that families bought because they made sense, good-sized lots, solid bones, enough bedrooms for the life they had at the time. But life shifts. A parent’s knees give out and the stairs become the problem. An adult child comes back, or a blended family arrives all at once, and a three-bedroom floor plan that was never designed for two households suddenly feels like it’s working against everyone. Some families are eyeing the attached garage that hasn’t held a real car in years, wondering whether it could finally earn its square footage. Others need a genuine second unit, private entrance, full kitchen, its own HVAC, not a remodeled spare room. What makes each project specific to Thornton is the home itself: older electrical panels, original HVAC systems sized for one household, and HOA design-review requirements in the newer northern neighborhoods that run parallel to city permitting. We start every conversation by asking what your family actually needs this house to do, then figure out what that takes.

Signal Creek

When a Home You Love Still Has More Family to Hold

Signal Creek was built with the kind of breathing room that’s hard to find, wide lots, greenbelt corridors, winding streets that feel genuinely residential rather than crammed in. But even a well-spaced home in a neighborhood this established can run out of the right configuration when a parent needs a private entrance and their own kitchen, or an adult child is back and a shared bathroom simply doesn’t work anymore. We pay close attention to Signal Creek’s HOA design standards and the community’s visual relationship with its greenbelts, so an addition or ADU reads as an intentional part of the original home rather than an afterthought. The neighborhood already has the character, we help your home catch up to your family.

Grange Creek

Honor the 1970s Character While Making Room for the Life You're Living Now

Homes in Grange Creek already carry something worth protecting, that distinctive board-and-batten exterior, the oriel bay windows that catch afternoon light just right, and a split-level layout that was thoughtfully designed for the era it was built in. What’s often still missing is a space that fits how your family actually lives today: a ground-floor in-law suite with a private entry and roll-in shower, a rear addition that finally gives the primary bedroom the room it deserves, or a garage conversion that becomes a fully finished ADU without touching the street-facing character the neighborhood is known for. We plan every scope around Grange Creek’s established architectural language and 1970s structural systems, so whatever you add feels like it grew from the home, not like it arrived from somewhere else.

Woodglen

When a Deed-Restricted Neighborhood Finally Has Room for the Whole Family

Woodglen’s family-oriented homes have real bones, good yards, solid layouts, parks nearby, but a floor plan built for one generation has a way of hitting a wall the moment an aging parent needs their own entrance or an adult child needs real independence. Adding space here means working through HOA architectural review before a permit ever gets submitted, because a plan that skips that step can stall out entirely at the worst moment. We handle both the city permitting and the HOA design-review tracks in parallel, accounting for exterior materials, rooflines, and any deed restrictions that govern what changes are visible from the street. The added space earns its place in Woodglen, it doesn’t create friction with it.

Hunters Glen

Make Space for the Family You're Still Becoming

Hunters Glen’s late-1990s and early-2000s homes were built for a family of a specific size living a specific way, and when that changes, the walls close in faster than you’d expect. A parent who can’t do stairs, an adult child who needs a real landing spot, or a household that’s quietly outgrown a three-bedroom layout can all push a well-kept home past what it was designed to hold. An addition or ADU gives that home a second chapter without asking you to leave the tree-lined streets and stable neighborhood you’ve already put down roots in. We work with the existing structure, lot depth, and architectural character of Hunters Glen homes so what gets built feels like it was always meant to be there.

Heritage Todd Creek

Design the Space That Lets You Stay Exactly Where You Want to Be

Heritage Todd Creek residents chose this community deliberately, the lifestyle, the neighbors, the sense of a place that actually works for this chapter. But even a well-built home in a well-run 55-plus community stops fitting when you want a dedicated hobby room, accessible guest quarters for visiting family, or a private suite that lets a loved one live independently without leaving the neighborhood. Because Heritage Todd Creek carries real HOA architectural standards across its eleven districts, any addition has to hold up to that review process. We coordinate the district approval and city permitting tracks simultaneously, then match your home’s rooflines, exterior materials, and proportions so what we add feels genuinely intentional, not like an afterthought that barely made it past the committee.

Our Thornton Additions & ADU Process

From the First Conversation to the Day Your Family Settles In

Adding an addition or ADU in Thornton brings questions that are specific to this city, a 1980s ranch with a 100-amp panel that can’t support a secondary unit without an upgrade, an HOA in your northern subdivision that runs its own design review separately from the city permit, a lot where utility trenching costs for a detached ADU surprise homeowners who assumed the hardest part was the build itself. A home near Thornton Town Center has a completely different set of considerations than a newer build in Parterre. Our process walks each project through site evaluation, design, permitting, utility coordination, construction, and final completion with one team keeping every phase clear from start to finish.

Start Planning Your Project
(303) 833-4715

.01

Site & Structure Review

Every Thornton addition or ADU starts with an honest look at what your property can actually support. We walk the lot, confirm setbacks, assess rear yard access, and look closely at how your family actually moves through the home today. On the ranch and tri-level homes that make up so much of this city’s housing stock, we also evaluate electrical capacity, load-bearing walls, and foundation conditions before any design decisions get made. That groundwork is what keeps the project grounded in reality.

.02

Goals & Design Direction

Before plans take shape, we talk through who this space is really for and what specific problem it needs to solve in your Thornton home. For most families we work with, that’s an aging parent who can’t manage stairs anymore, an adult child who needs real independence, or a household that’s quietly outgrown a three-bedroom ranch. We think carefully about how the new space connects to what’s already there, acoustically, visually, and structurally, so every decision feels like it belongs.

.03

Detailed Project Planning

Once we know where you’re headed, we turn your goals into a buildable plan grounded in what your Thornton property can actually support. That means naming the things that come up consistently in these homes, 100-amp panels that need upgrading, original HVAC that wasn’t sized for a second unit, HOA design-review requirements that run parallel to city permitting. Working through those realities before permit submittal is what keeps your scope honest and your timeline from unraveling.

.04

Permits & Trade Coordination

Before construction begins, we coordinate Thornton’s permit filings, HOA design-review submissions for subdivisions that require them, trade scheduling, and utility-connection sequencing for your specific project. We manage material lead times and the order each specialty trade needs to arrive, particularly on additions and ADUs where electrical panel upgrades, HVAC installation, and plumbing rough-ins have to land in the right sequence. That organization means you have one clear point of contact instead of chasing answers from multiple directions.

.05

Construction & Communication

With Thornton’s permits, and any required HOA design approvals, in place, your new space starts taking real shape. Framing, insulation, panel upgrades, mechanical work, drywall, flooring, cabinetry, and finishes all move forward under one coordinated team, whether we’re building a detached ADU, converting a garage into a livable suite, or adding a primary suite to an existing ranch. You stay informed the whole way while we protect the quality and connection between the new space and your existing home.

.06

Final Review & Completion

As construction wraps up, we walk the finished addition or ADU with you and go through every detail together, finishes, fixtures, accessibility features, and the way the new space reads alongside the Thornton home that was already there. We close out any remaining items and confirm that rooflines, siding, and window profiles read as one coherent exterior, not two separate projects bolted together. The goal is a space your parent, your adult child, or your household can step into immediately and feel completely at home.

Our Thornton Additions & ADU Process

From the First Conversation to the Day Your Family Settles In

Adding an addition or ADU in Thornton brings questions that are specific to this city, a 1980s ranch with a 100-amp panel that can’t support a secondary unit without an upgrade, an HOA in your northern subdivision that runs its own design review separately from the city permit, a lot where utility trenching costs for a detached ADU surprise homeowners who assumed the hardest part was the build itself. A home near Thornton Town Center has a completely different set of considerations than a newer build in Parterre. Our process walks each project through site evaluation, design, permitting, utility coordination, construction, and final completion with one team keeping every phase clear from start to finish.

.01

Site & Structure Review

Every Thornton addition or ADU starts with an honest look at what your property can actually support. We walk the lot, confirm setbacks, assess rear yard access, and look closely at how your family actually moves through the home today. On the ranch and tri-level homes that make up so much of this city’s housing stock, we also evaluate electrical capacity, load-bearing walls, and foundation conditions before any design decisions get made. That groundwork is what keeps the project grounded in reality.

.02

Goals & Design Direction

Before plans take shape, we talk through who this space is really for and what specific problem it needs to solve in your Thornton home. For most families we work with, that’s an aging parent who can’t manage stairs anymore, an adult child who needs real independence, or a household that’s quietly outgrown a three-bedroom ranch. We think carefully about how the new space connects to what’s already there, acoustically, visually, and structurally, so every decision feels like it belongs.

.03

Detailed Project Planning

Once we know where you’re headed, we turn your goals into a buildable plan grounded in what your Thornton property can actually support. That means naming the things that come up consistently in these homes, 100-amp panels that need upgrading, original HVAC that wasn’t sized for a second unit, HOA design-review requirements that run parallel to city permitting. Working through those realities before permit submittal is what keeps your scope honest and your timeline from unraveling.

.04

Permits & Trade Coordination

Before construction begins, we coordinate Thornton’s permit filings, HOA design-review submissions for subdivisions that require them, trade scheduling, and utility-connection sequencing for your specific project. We manage material lead times and the order each specialty trade needs to arrive, particularly on additions and ADUs where electrical panel upgrades, HVAC installation, and plumbing rough-ins have to land in the right sequence. That organization means you have one clear point of contact instead of chasing answers from multiple directions.

.05

Construction & Communication

With Thornton’s permits, and any required HOA design approvals, in place, your new space starts taking real shape. Framing, insulation, panel upgrades, mechanical work, drywall, flooring, cabinetry, and finishes all move forward under one coordinated team, whether we’re building a detached ADU, converting a garage into a livable suite, or adding a primary suite to an existing ranch. You stay informed the whole way while we protect the quality and connection between the new space and your existing home.

.06

Final Review & Completion

As construction wraps up, we walk the finished addition or ADU with you and go through every detail together, finishes, fixtures, accessibility features, and the way the new space reads alongside the Thornton home that was already there. We close out any remaining items and confirm that rooflines, siding, and window profiles read as one coherent exterior, not two separate projects bolted together. The goal is a space your parent, your adult child, or your household can step into immediately and feel completely at home.
Start Planning Your Project
(303) 833-4715

What Thornton Homeowners Want From Their Addition or ADU

More Room for the
Family Collision You Didn't Plan For

Addition and ADU projects in Thornton are almost always triggered by a collision, a parent whose mobility has changed and whose stairs are now a daily problem, an adult child who’s back and needs somewhere real to land, or a three-bedroom ranch that was never designed to hold two households at once. Thornton’s 1970s–2000s production ranches carry enough equity to fund a real project, but their undersized electrical panels, original HVAC, and aging plumbing mean the honest scope conversation has to happen before anyone falls in love with a floor plan the existing structure can’t yet support. In newer northern subdivisions like Parterre, HOA design review runs as a parallel track alongside city permitting, exterior materials, roofline compatibility, and landscaping restoration all have to be managed as part of the same contract, not handed back to you afterward. What Thornton homeowners want most is a space that solves a real family problem completely, looks like it was always part of the home, and holds up on resale.

Space for Whoever Comes Home

Space That Works For Real

In Thornton's established mid-city subdivisions, most ranches and tri-levels were built for households a fraction of today's size, and without any thought given to multigenerational configurations. A thoughtful addition or ADU can create a genuinely independent suite for aging parents, give an adult child their own entrance, or finally open a main living area that's felt too tight for years.

Plans Built for What's Next

Room That Grows With You

Many Thornton ranches are still running on floor plans that made complete sense in 1985, but feel like a daily obstacle now. Reconnecting old and new space with intentional flow and no jarring transitions is where these projects start to feel like a real home again.

Utility Upgrades, Finally Solved

Their Own Door, Their Space

Thornton's suburban lot depths open real possibilities for additions that solve more than square footage alone. Built-in storage, a dedicated mudroom, and sensibly placed laundry make the finished space feel calmer, more organized, and genuinely easier to move through every single day.

Independent, But Still Close

Together, With Real Breathing Room

For homeowners near Thornton Town Center and in Wyndemere, a permitted ADU or in-law suite with a private exterior entry can make multigenerational living feel genuinely sustainable rather than improvised. Wide doorways, a no-step entry, and independent climate control change how the whole arrangement feels, for everyone living in it.

Matched to Thornton's Real Winters

Built for Thornton's Real Life

Thornton additions have to hold up against freeze-thaw cycles, hail seasons, and the wind that tests every roofline connection and exterior seam across the Front Range plains. Exterior cladding, properly detailed flashing, and interior finishes chosen for real Colorado conditions keep the new space performing exactly the way it should, year after year.

What To Consider When Building An Addition or ADU In Thornton

Give Your Family the Space
They've Been Waiting For

An addition or ADU can completely change how a Thornton home holds the people you’re trying to keep close, but the best projects start well before a floor plan gets drawn. Many of the ranch and tri-level homes here carry undersized electrical panels, original HVAC that was never meant to serve a second unit, and lot configurations that need real utility planning, line items that land hard if they’re discovered mid-construction rather than during pre-construction assessment. Knowing who the space is truly for, what independence means to them on a given Tuesday, and what your specific home can honestly support is where the right project begins.

Who is this space actually for, and what does their day really look like inside it?

It’s easy to start with square footage and end up with a room that solves the wrong problem. Before you think about floor plans, sit with the person this space is meant for. Does your mom need a no-step entry and a shower she can use safely on her own? Does your adult child need genuine privacy, a separate front door, not just a closed bedroom? The more honestly you can picture their daily rhythm inside that space, the more the right scope reveals itself.
A lot of Thornton’s 1980s and 1990s ranches look like great candidates for an addition or ADU, until pre-construction reveals a 100-amp panel, original HVAC that can’t stretch another zone, or a crawl space that needs remediation before footings can go in. That’s not a dealbreaker; it’s just scope that needs to be named up front. Knowing what your home is actually carrying before design begins is what separates a project that stays on budget from one that surprises you at framing.
In a lot of Thornton’s newer northern subdivisions, HOA design review runs on a separate track from city permitting, and it can add weeks if you’re not prepared. It’s worth understanding early whether your association requires exterior material matching, roofline compatibility review, or landscaping restoration before the addition is complete. That’s not a reason to slow down; it’s a reason to start the HOA conversation at the same time as the permit conversation, not after.
There’s a moment, usually a few weeks after construction wraps, when everyone stops talking about the project and just starts using the space. Your parent makes their first cup of coffee without coming through your kitchen. Your family has the first dinner where no one’s cramped. That’s the moment worth designing toward. When you’re weighing decisions about finishes, layout, and connection to the main home, ask yourself which choices make that moment feel most natural, not just which ones look best in a rendering.

Our Reviews

Trusted by Thornton Homeowners
With the Spaces Their Families Depend On

Choosing a team for an addition or ADU in Thornton means trusting them with more than a construction project, it’s trusting them with the hour after dinner, when your family finally settles into a space that was built around your real life. Our reviews reflect the honest communication, steady process, and genuine care Christie’s brings to every Thornton project from the very first conversation through the final walkthrough.
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Areas We Service Across Thornton

Room for Everyone
Right Here in Thornton

Across Thornton, homeowners are sitting in 1980s and 1990s ranches they chose because the value made sense and the neighborhood felt like home, and now they’re bumping into a floor plan that was never built for a parent who needs their own entrance, an adult child who’s back, or a household that simply needs room to breathe. From established pockets near Thornton Town Center where older electrical panels and original HVAC are part of the conversation, to newer HOA-governed communities like Parterre where exterior design review runs alongside city permitting, every property brings a different set of realities. Christie’s works through Thornton’s actual specifics, undersized systems, roofline matching, subdivision covenants, ADU size rules, and builds space that feels like it was always meant to be there.
  • Thornton Town Center
  • Wyndemere
  • Parterre
  • Trail Winds
  • Hunters Glen
  • Eastlake
  • Legacy
  • Springvale
  • North Creek Farms
  • Woodbridge
  • Thornton Village
  • Shadow Ridge
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(303) 833-4715

Other Areas We Service

Weld County

Greeley, CO
Erie, CO
Fort Lupton, CO
Firestone, CO
Frederick, CO

Boulder County

Boulder, CO
Lafayette, CO
Longmont, CO
Louisville, CO

Adams County

Brighton, CO
Commerce City, CO
Northglenn, CO

Jefferson County

Arvada, CO
Westminster, CO

Broomfield County

Broomfield, CO

Larimer County

Loveland, CO
Windsor, CO

Thornton Addition & ADU Frequently Asked Questions

The Questions Behind
Making Your Thornton Home Work for Your Family

Adding onto a home you already love in Thornton brings a specific set of questions, especially when your 1980s ranch was built for one family configuration and your life has shifted into something entirely different. The answers here depend on your lot’s setbacks, what your existing electrical panel and HVAC can actually support, and whether your subdivision’s HOA runs a parallel design-review process alongside the city’s permit track. Thornton also has specific ADU size rules and active-permit inspection requirements for phased builds that most homeowners don’t know about until someone lays them out plainly. These are the questions we hear most from Thornton families who are ready to build the space their home was always missing.

Still Have Questions?
We're Here To Help.

Contact Us
(303) 833-4715

How big can an ADU be on my Thornton lot?

Thornton caps ADU size at 75% of your primary home’s floor area or 1,000 square feet, whichever is less. So if your ranch is 1,100 square feet, your ADU tops out around 825 square feet, not 1,000. That’s a meaningful distinction and one that shapes how we think about layout from the very first design conversation. It’s also why we look at your specific lot and home dimensions early, before anyone falls in love with a floor plan that can’t actually be permitted.
In a lot of Thornton, especially the newer northern subdivisions, yes. HOA design review operates as a parallel approval track alongside city permitting, which means you can have a fully approved city permit and still be waiting on your association’s exterior materials decision. We manage both tracks simultaneously. Roofline compatibility, siding matching, landscaping restoration after construction, those aren’t things we hand back to you after the city signs off. They’re part of the scope from the beginning.
The most consistent ones we find in Thornton’s older ranch stock are 100-amp electrical panels that can’t support a secondary unit, original HVAC sized only for the home as it was built, and galvanized plumbing that needs to be addressed before permits are pulled. These aren’t worst-case scenarios, they’re typical. We’d rather surface them in pre-construction assessment than discover them mid-build. That’s one of the real reasons the design-build model earns its place here: scope discovery, structural engineering, and utility coordination happen under one contract, so nothing falls between handoffs.
Phased construction is possible, and we’ve helped Thornton homeowners structure it as a cash-flow strategy. The thing to know upfront: Thornton requires an active-permit inspection every six months to keep the permit valid during a phased build. Miss that window and you’re re-applying. We plan the phasing schedule around those inspection requirements from the start so the timeline stays clean and you’re not caught off guard by a compliance gap.
It depends on the scope, and we tell you honestly before you sign anything. A room bump-out can wrap in about eight weeks with contained disruption. A full garage conversion, with insulation, mini-split installation, egress windows, and a kitchenette, runs longer and touches more systems. A second-story addition is the most involved. We sequence the work to minimize the days when your home feels like a job site, and we keep you informed at every phase so nothing catches you off guard on a Tuesday morning.
It’s a fair question and one we hear often. The honest answer is that a high-quality, fully permitted ADU conversion, with real finishes, a functional kitchen, a private entry, tends to offset the loss of enclosed parking for most buyers at Thornton’s current price point. What hurts resale is an unpermitted conversion or one that reads like a renovation afterthought. Done right, at premium finish level, a garage ADU signals intentional architecture. We’ve seen homeowners with well-executed conversions attract buyers who specifically want that secondary unit.
It means the new structure looks like it was always there. Same roofline pitch, matching siding material, window profiles that echo the primary home, not a contrasting box bolted onto the back. Thornton homeowners at the premium tier ask about this explicitly during initial consultations, which tells us it matters deeply. We treat exterior consistency as a standard deliverable, not an upgrade. If you bring us reference photos of additions you love, or ones you’d never want, we build those preferences into the design from day one.
The differences are specific and intentional. Wider doorways, 36 inches minimum, so a wheelchair or walker never has to fight the frame. No-step entries so there’s no threshold to trip on after a long day. Roll-in showers with grab bars positioned where someone actually needs them. Lever-style door hardware that works without a tight grip. Single-floor layouts so stairs are never part of the equation. These aren’t add-ons we layer on at the end, they shape the floor plan from the first sketch. Your parent’s first summer morning in that space should feel easy. That’s what the design is for.

Start The Conversation

Your Thornton Home
Has Room for the People Who Matter Most

When your Thornton ranch still fits your life but not quite everyone in it, an addition or ADU can change that in a real, lasting way. A private entrance for your parent. A full kitchen, accessible bathroom, and genuine independence, not a converted spare bedroom with a mini-fridge. Christie’s Design/Build Remodeling knows what these 1970s and 1980s ranches carry under the surface, undersized panels, original HVAC, HOA design review, and manages every layer so what gets built looks like it was always meant to be there.
Start Planning Your Project
(303) 833-4715

Our Other Remodeling Services

Kitchen
Remodeling

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Basement
Finishing

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Whole-Home
Remodeling

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Bathroom
Renovation

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Deck
Construction

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Outdoor
Living Spaces

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From The Blog

Your Thornton Home
Already Has Room for the Family You Need

Planning an addition or ADU in Thornton, especially when your ranch home has an undersized panel, an HOA design-review board, and a parent who needs accessible space now, raises questions that deserve real answers before you spend a dollar. Our blog covers those decisions plainly, from ADU size limits and phased permits to what multi-generational layouts actually look like when they’re done right.