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

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

Additions and ADUs in Firestone, CO

Building Space for Everyone Your Family Is Becoming

Start Planning Your Project

Why Firestone Homeowners Choose Christie's

Because the Home You've Rooted In
Should Have Room for Everyone Who Belongs There

For more than 25 years, Christie’s has helped Firestone families build the space their households have been growing toward. A parent who can’t manage stairs alone anymore. An adult child back home while life resets. A household that chose this neighborhood for the schools and the community and isn’t ready to trade that away just to get more square footage somewhere else. The goal is always the same: make staying feel like exactly the right decision.

At Christie’s Design/Build Remodeling, we start by understanding what’s actually driving the conversation, not just the square footage you need, but why you need it and who it’s really for. We look at your existing foundation type, your aging mechanical systems, and whether your lot gives us room to go out or whether we need to go up. From established ranch homes near the older core of town to the production-built craftsman subdivisions that filled in through the 2000s and 2010s, we plan every addition and ADU around the home you already have and the life you’re committed to building here.

In Business

25+ Years

Helping Firestone homeowners build in-law suites, ADUs, and additions engineered for multi-generational living, without leaving the community they've worked to build.

Our Model

One Team

Your Firestone addition or ADU moves through one coordinated team from engineering and permits through construction, finishing, and the final walkthrough.

Where We Work

Firestone, CO

Serving homeowners throughout Evanston, Town Center, Centennial Ranch, Barefoot Lakes, and established neighborhoods across Firestone.

Peace Of Mind

5-Year Warranty

Your new Firestone addition or ADU stays protected after construction wraps, so you can settle your family in with real confidence.

What Makes Additions & ADUs Different In Firestone

New Space Should Feel
Like It Was Always Part of the Plan

Adding onto your Firestone home means building space that fits the life you’ve already built here.

.01

Firestone Homes Have a Specific Story

Ranch-style and two-story production homes each present different paths for adding space, out, up, or through the garage. We study the lot, the structure, and the foundation before any scope gets locked in.

.02

Production-Built Homes Need a Close Look

Production-built homes from the late 1990s through mid-2010s have foundations, load paths, and mechanical systems worth understanding before adding on. We assess what’s there first so the new space connects the right way.

.03

Aging Systems Deserve an Early Look

Firestone’s 15–25-year-old homes often have HVAC, electrical, or plumbing that needs attention once walls open. Catching those needs in planning keeps construction moving without costly mid-project decisions.

.04

Front Range Weather Drives Material Choices

Firestone’s freeze-thaw cycles, hail exposure, and intense UV index make exterior material selection a functional decision, not just an aesthetic one. We spec siding, roofing, and windows that hold up through Colorado seasons without constant upkeep.
See Our Work

Firestone, CO Neighborhoods

More Room Without Leaving
the Firestone You've Built Your Life Around

Firestone is full of homes families chose deliberately, for the schools, the neighbors, the sense of having planted something real, which is exactly why an addition or ADU carries so much weight here. Some households need a private suite before a parent’s next chapter begins. Others are carving out a real landing spot for an adult child coming back. Sometimes it’s a production-built ranch from 2005 that was never designed to flex the way life eventually demands. Across Firestone, what’s possible depends on your specific lot, your foundation type, and what your existing structure can carry, all things that require honest pre-construction evaluation before any plan takes shape. Newer, denser subdivisions often push toward second-story additions or garage conversions when rear yard depth runs short. There’s also the access permit step that precedes the building permit on ADU projects, a detail that catches most homeowners off guard. We start by asking what staying here actually needs to look like for the years ahead.

Oak Meadows

Build the Space Your Firestone Family Has Needed All Along

Oak Meadows is the kind of neighborhood families plant roots in and genuinely don’t want to leave. When your floor plan starts straining under a parent who needs to move in, or an adult child who’s come back home, an addition or ADU lets you build what the household actually needs without trading away your school assignment or your community. That might mean a private in-law suite with its own entry and kitchenette, a garage conversion with a dedicated HVAC zone, or a room bump-out that finally gives everyone breathing room. We work through the HOA architectural review alongside you and engineer the addition to tie cleanly into your existing home’s structure.

Saddleback

Add the Space Your Family Needs Without Leaving the Neighborhood You've Built Your Life Around

Homes in Saddleback already sit on generous lots framed by mature trees and established landscaping, there’s real space to work with here, and families who’ve put down roots in this subdivision tend to know exactly what they’re missing. An in-law suite with a private entry, a second-story addition that gives a returning adult child real separation, or a garage conversion that finally becomes livable square footage, these are the projects we plan carefully around what’s already here. We work around your mature vegetation, your existing floor plan’s bones, and the architectural character that makes your home feel like home, so what we add reads like it always belonged.

Monarch Estates

Make More Room for Everyone Who Matters

Homes in Monarch Estates were built with contemporary open-concept layouts that work beautifully right up until your household changes, a parent who needs a private space nearby, an adult child coming back, or simply a family that’s grown past four bedrooms and two and a half baths. An addition or in-law suite can give the people you love a real place to land, with a private entry and a kitchen of their own. Because HOA architectural review applies here, we handle that process alongside the permit work so nothing stalls unexpectedly. Every roofline, exterior material, and interior detail gets considered against the home you already have, so the new space feels like it was always part of the plan.

Barefoot Lakes

Make Room for Everyone Who Belongs Here

Even brand-new homes in Barefoot Lakes can start to feel tight once the household shifts, a parent who needs to move in, an adult child who’s come back, or a remote-work setup that needs real separation from the living spaces. The modern floor plans here are well-built, but they weren’t designed for multi-generational living or a private ADU on the same lot. An in-law suite, garage conversion, or addition can create that space without trading away the lake, the schools, or the community you specifically chose. We work around Barefoot Lakes’ newer construction, builder systems, and HOA design guidelines so everything integrates cleanly and serves your household for the long run.

Neighbors Point

Built to Stay, Room to Grow

Neighbors Point families chose this community for the parks, the school assignment, and the kind of neighborhood where kids actually play outside, and most have no intention of leaving. When the household shifts, whether that means a parent who needs a private space nearby or an adult child coming back, the house itself needs to catch up. D.R. Horton’s floor plans are well-built but standardized, so additions here call for careful structural evaluation before scope is finalized. We work through that pre-construction phase thoroughly, then match rooflines, exterior cladding, and interior finishes so the new space reads as original, not as something added later.

Our Firestone Additions & ADU Process

From the First Conversation to the Day You Move In

Adding an addition or ADU in Firestone comes with questions that are specific to your lot, your home’s construction era, and a permit path that includes an Access Permit step before the building permit even opens, a detail that catches most homeowners off guard. A garage conversion on a newer subdivision lot calls for a different approach than a rear in-law suite addition on an earlier ranch-style home, and HOA design review adds another layer of scheduling in most post-2000 neighborhoods. Our process carries each project through site evaluation, engineering, permitting, construction, and final walkthrough so every phase stays clear and the finished space feels like it always belonged.

Start Planning Your Project
(303) 833-4715

.01

Site & Structure Review

Every Firestone addition or ADU starts with a close look at what’s already there. We assess your lot, foundation type, existing structure, setbacks, and how aging mechanical systems might interact with the new scope. Production-built homes from the late 1990s through the mid-2010s carry specific structural and utility considerations that have to be understood before design begins. Getting that clarity early is what makes the rest of the project move with confidence.

.02

Goals & Design Direction

Before plans take shape, we sit down and talk through what actually needs to change for your household, whether that’s a private entry for a parent moving in, a full kitchenette for an ADU, or a bedroom addition that gives everyone a little more room to breathe. In Firestone, that conversation usually starts with multi-generational living and what separation, accessibility, and daily independence look like in practice. We consider how the new space connects to your existing home, how circulation flows, and what the layout needs to do for the people who’ll use it every day.

.03

Detailed Project Planning

Once the direction is clear, we work through the details that turn the idea into a buildable plan for your specific Firestone property, foundation tie-in, framing, insulation, HVAC zoning, and utility coordination all get resolved before construction begins. Production-built homes from the late 1990s through mid-2010s carry their own structural realities, so we assess the existing slab or crawl space, aging mechanical systems, and bearing walls before scope is finalized. This stage makes sure everyone understands exactly how the addition or ADU comes together, so there are no surprises once the crew is on site.

.04

Permits & Trade Coordination

Before construction begins, we handle the permits, approvals, and scheduling that Firestone projects require, including the Access Permit step that comes before the building permit application, which most homeowners don’t know exists until it slows them down. We manage review timelines, material lead times, inspection sequencing, and trade coordination from one point of contact. That organization up front is what keeps your project moving instead of stalling.

.05

Construction & Communication

With approvals in place, your new space starts taking shape on the ground. Framing, insulation, mechanical systems, drywall, flooring, cabinetry, and finishes all move forward under one coordinated team. Whether we’re building an in-law suite with a private entry, a detached ADU, or a second-story addition, we keep you informed throughout and protect the quality and connection between the new space and your existing home.

.06

Final Review & Completion

As construction wraps up, we walk the completed addition or ADU with you and go through the details together, finishes, accessibility features, mechanical connections, and anything still on the punch list. We confirm the new space ties into your Firestone home the way it was designed to, from the exterior cladding down to the private entry hardware. The goal is a finished project that feels settled and ready, so the moment you hand over the key to a parent or move into the new room yourself, it already feels like home.

Our Firestone Additions & ADU Process

From the First Conversation to the Day You Move In

Adding an addition or ADU in Firestone comes with questions that are specific to your lot, your home’s construction era, and a permit path that includes an Access Permit step before the building permit even opens, a detail that catches most homeowners off guard. A garage conversion on a newer subdivision lot calls for a different approach than a rear in-law suite addition on an earlier ranch-style home, and HOA design review adds another layer of scheduling in most post-2000 neighborhoods. Our process carries each project through site evaluation, engineering, permitting, construction, and final walkthrough so every phase stays clear and the finished space feels like it always belonged.

.01

Site & Structure Review

Every Firestone addition or ADU starts with a close look at what’s already there. We assess your lot, foundation type, existing structure, setbacks, and how aging mechanical systems might interact with the new scope. Production-built homes from the late 1990s through the mid-2010s carry specific structural and utility considerations that have to be understood before design begins. Getting that clarity early is what makes the rest of the project move with confidence.

.02

Goals & Design Direction

Before plans take shape, we sit down and talk through what actually needs to change for your household, whether that’s a private entry for a parent moving in, a full kitchenette for an ADU, or a bedroom addition that gives everyone a little more room to breathe. In Firestone, that conversation usually starts with multi-generational living and what separation, accessibility, and daily independence look like in practice. We consider how the new space connects to your existing home, how circulation flows, and what the layout needs to do for the people who’ll use it every day.

.03

Detailed Project Planning

Once the direction is clear, we work through the details that turn the idea into a buildable plan for your specific Firestone property, foundation tie-in, framing, insulation, HVAC zoning, and utility coordination all get resolved before construction begins. Production-built homes from the late 1990s through mid-2010s carry their own structural realities, so we assess the existing slab or crawl space, aging mechanical systems, and bearing walls before scope is finalized. This stage makes sure everyone understands exactly how the addition or ADU comes together, so there are no surprises once the crew is on site.

.04

Permits & Trade Coordination

Before construction begins, we handle the permits, approvals, and scheduling that Firestone projects require, including the Access Permit step that comes before the building permit application, which most homeowners don’t know exists until it slows them down. We manage review timelines, material lead times, inspection sequencing, and trade coordination from one point of contact. That organization up front is what keeps your project moving instead of stalling.

.05

Construction & Communication

With approvals in place, your new space starts taking shape on the ground. Framing, insulation, mechanical systems, drywall, flooring, cabinetry, and finishes all move forward under one coordinated team. Whether we’re building an in-law suite with a private entry, a detached ADU, or a second-story addition, we keep you informed throughout and protect the quality and connection between the new space and your existing home.

.06

Final Review & Completion

As construction wraps up, we walk the completed addition or ADU with you and go through the details together, finishes, accessibility features, mechanical connections, and anything still on the punch list. We confirm the new space ties into your Firestone home the way it was designed to, from the exterior cladding down to the private entry hardware. The goal is a finished project that feels settled and ready, so the moment you hand over the key to a parent or move into the new room yourself, it already feels like home.

Start Planning Your Project
(303) 833-4715

What Firestone Homeowners Want From Their Addition or ADU

More Room for the
Family You're Keeping Close

Addition and ADU projects in Firestone are almost never about square footage, they’re about a household that’s simply outgrown its original floor plan. Most families here are trying to solve something they feel every single day: a parent who needs to be close but deserves real privacy, an adult child who’s moved back home and needs their own space, or a layout that made perfect sense at purchase but doesn’t anymore. Firestone’s production-built ranch and two-story homes from the late 1990s through mid-2010s weren’t designed with a second household in mind, but the school assignments, the neighbors, and the community ties that brought your family here are genuinely worth keeping. What Firestone homeowners want most is a space that functions like a permanent part of the home, private entry, full kitchenette, accessible bathroom, built to last as long as the life you’re building here.

Space for Every Generation

Space You Actually Needed

In Firestone's established post-2000 subdivisions like Neighbors Point and Booth Farms, many homes were built with efficient, tight layouts that served smaller households well but show real strain as families grow or change. A thoughtful addition can open the living areas, create a proper in-law suite, or carve out the separation that lets a multigenerational household actually function without everyone feeling crowded.

Layouts Built for Real Life

Room for Who's Coming

Firestone's late-1990s and early-2000s homes were laid out for the households that bought them then, not the households living in them now. A well-planned addition reworks those connections so every room earns its place and the whole house flows naturally again.

Accessible Storage, Built Right

Everyone Has Their Place

Firestone's production-built homes often have rear yards deep enough to accommodate a real addition without sacrificing the outdoor space your family actually uses. Smart planning turns that footprint into built-in storage, dedicated laundry, and rooms that finally feel organized.

A Suite With Real Privacy

Together, But With Doors

For families in Firestone's newer subdivisions near Town Center and Evanston, an in-law suite or detached ADU can make multigenerational living feel genuinely comfortable rather than crowded. Separate entries, private kitchenettes, and dedicated baths give everyone real independence while keeping the people you love close.

Finishes That Outlast Colorado

Built for Front Range Winters

Firestone additions need to stand up to Front Range freeze-thaw cycles, summer hail, and high UV exposure that fades and degrades materials faster than most homeowners expect. Choosing the right siding, roofing, and window products isn't a cosmetic decision here, it's a practical one that determines how the space holds up over years of real Colorado weather.

What To Consider When Building An Addition or ADU In Firestone

Build for the Family
You're Actually Keeping Here

An addition or ADU can completely change how your Firestone home holds the people who matter most, but the strongest projects begin with more than a square-footage number. A production-built ranch from the early 2000s on a deeper lot may offer rear expansion options a newer home in a denser subdivision simply can’t match, while your existing foundation type, mechanical system age, and HOA design standards all shape what’s actually practical before a single plan is drawn. Understanding what the new space needs to solve, whether that’s a private entry for an aging parent, a separated living zone for a returning adult child, or rental income without leaving your school district, is the real starting point.

Is this space built for how your family actually lives, or how you hoped things might work out?

It’s worth sitting with that question before a single plan is drawn. An in-law suite with a private entry and a full kitchenette solves a different problem than a shared bedroom with a bathroom added on. Think about who is moving in, how much independence they need, and whether you’re planning for the next five years or the next twenty. The more honest you are about the daily rhythms now, the less you’ll be reworking decisions later.
Firestone’s production-built homes from the late 1990s through the mid-2010s were engineered for the layout they shipped with, not for a second story or a full in-law suite tying into their foundation. Before you fall in love with a floor plan, it’s worth asking what’s underneath: is it a slab or a crawl space, how old are the mechanical systems, and what will the addition actually connect to? Those answers shape your scope before design even begins.
In most of Firestone’s newer subdivisions, you’re running two approval tracks at once: the town’s building permit process and your HOA’s design review. They move on different schedules and can each push back on exterior materials, rooflines, and entry placement. There’s also an Access Permit required before the building permit application opens for ADUs, a step that catches a lot of homeowners off guard. Understanding that timeline early keeps your project from stalling at a moment you didn’t expect.
Firestone’s weather is specific, hard freeze-thaw cycles, hail seasons, and UV exposure that works through exterior coatings faster than most people expect. The siding, roofing, and windows you choose aren’t just aesthetic decisions; they’re maintenance decisions you’ll live with for decades. If you’re building something permanent for your family, it’s worth asking which materials hold up here and which ones look great on day one but demand attention by year seven. That conversation is worth having before the design is finalized.

Our Reviews

Trusted by Firestone Families
With the Spaces Their Households Depend On

Choosing a team for an addition or ADU in Firestone means trusting them with more than a construction project. You’re trusting them with your home, your family’s daily routines, and a space that may house a parent or an adult child for years to come. Our reviews reflect the communication, care, and follow-through Christie’s brings to every Firestone project, from that first conversation about your in-law suite all the way through the final walkthrough.
Start Planning Your Project

Areas We Service Across Firestone

Space for Everyone
Right Here in Firestone

Across Firestone, families are making the home they’ve already put roots into work for the next chapter, whether that means a private in-law suite for a parent who’s ready to be closer, a detached ADU that keeps an adult child nearby without giving up anyone’s independence, or a rear addition that finally gives the house the space the household has outgrown. From the post-2000 subdivisions with tight lots and production-built two-stories to the older ranch neighborhoods with more room to expand, every property here tells a different story. Christie’s starts with yours, the people living there, the school district you’re not willing to leave, and the life you’re building for the long term right here in Firestone.

  • Ralston Valley
  • Oberon
  • Pomona Lakes
  • Whisper Creek
  • Spring Mesa
  • Olde Town Arvada
  • Allendale
  • Lake Arbor
  • Scenic Heights
  • Alta Vista
  • Club Crest
  • Hackberry Hill
Start Planning Your Project
(303) 833-4715

Other Areas We Service

Weld County

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

Boulder County

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

Adams County

Brighton, CO
Commerce City, CO
Northglenn, CO
Thornton, CO

Jefferson County

Arvada, CO
Westminster, CO

Broomfield County

Broomfield, CO

Larimer County

Loveland, CO
Windsor, CO

Firestone Addition & ADU Frequently Asked Questions

The Questions Behind
Building Space That Keeps Your Family Here

Adding onto a home you already love in Firestone brings a different set of questions than starting fresh somewhere else. Here, the answers depend on everything from your home’s foundation type and mechanical age to lot dimensions, setbacks, HOA design review, and whether the new space will share a wall with yours or stand on its own. Firestone also has specific permitting steps for additions and ADUs, including an Access Permit requirement most homeowners don’t know about until it’s in front of them. These are the questions we hear most from families who want more room without giving up the school district, the neighbors, and the community they’ve already built their lives around.

Still Have Questions?
We're Here To Help.

Contact Us
(303) 833-4715

Why does Firestone require an Access Permit before I can apply for a building permit on an ADU?

This is the step that catches most Firestone homeowners off guard. Before the Town will open a building permit application for an ADU, you need to obtain an Access Permit, essentially a review of how the new dwelling unit will connect to the public right-of-way. It’s a separate submission to the Building Department, and skipping it or misunderstanding the sequence can delay your project by weeks before construction even starts. We coordinate this step early so it doesn’t become a surprise that reshapes your timeline.
For a single-family addition in Firestone, plan for 60 to 180 days of permit review, that’s a real range, and where your project lands within it depends on completeness of the submittal, the complexity of the scope, and how the Town’s review queue sits at the time you apply. ADU permits may move faster under Colorado’s state-mandated ADU review timelines. The honest takeaway: permit review is measured in months, not weeks, which is exactly why we start permit coordination early and in parallel with design work rather than after it.
That question gets answered in pre-construction engineering, not during framing. Firestone’s production-built stock from the late 1990s through the mid-2010s was designed for one story or a specific two-story configuration, it was not engineered with future additions in mind. Before we finalize scope on a second-story addition, we assess the existing bearing walls, the foundation type (slab versus crawl space), and whether reinforcement is needed. That evaluation happens before anything goes on paper as a fixed scope, so you’re not discovering structural surprises mid-build.
In most of Firestone’s post-2000 subdivisions, your HOA design review runs parallel to, and sometimes ahead of, municipal permitting. That means roofline changes, exterior material choices, and where a private entry can be located all have to pass HOA scrutiny in addition to meeting Town code. We treat dual-track approval as a standard project variable, not an afterthought. Design decisions that need HOA sign-off get identified early so your exterior scope isn’t held up waiting on an approval that should have been submitted two months prior.
In most cases, yes, and we plan the construction sequence specifically to protect that. For attached additions and in-law suite buildouts, the critical moments are when systems like HVAC and electrical need to tie into the main house. We schedule those connections to minimize how long anything is offline, and we’re clear with you upfront about the days or phases where you’ll feel the disruption most. For detached ADUs and garage conversions, the main house stays largely undisturbed throughout. No surprises about this, we walk through it with you before a single permit is filed.
An attached in-law suite connects directly to the main home, often through a shared interior wall or hallway, while a detached ADU is a fully independent structure on the same property with its own entry, utilities, and address. Which one works better for your family depends on how much privacy both households want, your lot’s rear and side setback room, and whether the goal is multi-generational living or potential rental income. In Firestone’s earlier subdivisions, lots often have enough rear depth for a detached structure. Newer, denser developments tend to push homeowners toward attached suites or garage conversions. We look at your specific lot and your family’s situation together before recommending a direction.
This is a practical question, not a cosmetic one, and the homeowners we work with in Firestone ask it directly. Front Range freeze-thaw cycles stress siding joints and caulk lines. Hail events, which are common on the Northern Colorado plains, can damage standard vinyl or fiber cement if it’s not specified to the right impact rating. High UV index at this elevation degrades exterior coatings faster than most manufacturers’ warranties assume. We guide you through siding, roofing, and window selections that are matched to these specific conditions, so the materials on your addition aren’t requiring attention in year four.
Not necessarily, but it’s a conversation that happens during pre-construction, not after framing is up. Firestone’s production-built homes from the late 1990s and 2000s have mechanical systems that are approaching or past typical service life. When we scope an addition, we evaluate whether the existing system has the capacity to condition new square footage or whether a dedicated mini-split zone for the new space is the better path. In-law suites and ADUs almost always get a separated HVAC zone regardless of the main system’s age, it gives both households independent temperature control and avoids the friction of sharing one thermostat. We make a clear recommendation early, so the system decision doesn’t surface as a change order later.

Start The Conversation

Build the Space
Your Firestone Family Has Needed

When your Firestone home still feels right but the floor plan no longer fits, an addition or ADU can open up what comes next. Room for a parent moving in. Privacy for an adult child who’s back. A dedicated space to work, host, or simply breathe without the whole household on top of each other. Christie’s Design/Build helps you build that space around the way your family actually lives, designed to feel like it always belonged to the home you’ve already put down roots in.

Start Planning Your Project
(303) 833-4715

Our Other Remodeling Services

Kitchen
Remodeling

Learn More

Basement
Finishing

Learn More

Whole-Home
Remodeling

Learn More

Bathroom
Renovation

Learn More

Deck
Construction

Learn More

Outdoor
Living Spaces

Learn More

From The Blog

When Your Firestone Home
Finally Has Room for Everyone

Building an addition or ADU in Firestone means navigating real decisions, from engineering your production-built home’s foundation to managing HOA design review alongside the municipal permit process. Our blog shares practical guidance on multi-generational layouts, accessibility features, permit timelines, and the material choices that hold up to Front Range winters and summer sun.