Additions and ADUs in Louisville, CO
A Home That Finally Has Room for Everyone You Love
Why Louisville Homeowners Choose Christie's
Because the Home You've Chosen to Stay In
Should Finally Have the Space to Prove It
For more than 25 years, Christie’s has helped Louisville homeowners figure out how to stay in the city they’ve deliberately chosen, and build the space that makes staying make sense. A basement that’s been sitting unfinished for fifteen years, finally converted into a real in-law suite with a private entrance, a full kitchen, and a no-step shower your parent can actually use. A detached ADU in the backyard that works for mom today and becomes a long-term rental in five years when her situation changes.
At Christie’s Design/Build Remodeling, we start by being honest about what your 1980s ranch can actually carry, the electrical panel, the existing plumbing, the basement ceiling height, because in Louisville, those details surface at the permit stage whether you’ve planned for them or not. From Old Town’s historic overlay to newer subdivisions near McCaslin and the established neighborhoods tucked between Highway 42 and the open space, we plan additions and ADUs around your real home, your real lot, and the next twenty years of your life in it.
In Business
25+ Years
Helping Louisville homeowners turn aging basements, underused garages, and modest ranch footprints into private, fully permitted living space for the people they're building the next chapter around.
Our Model
One Team
Your Louisville addition or ADU stays with one coordinated team from feasibility and design through permitting, construction, and the final walkthrough.
Where We Work
Louisville, CO
Serving homeowners throughout Old Town Louisville, Harper Lake, Coal Creek Ranch, Centennial Valley, and established neighborhoods across Louisville.
Peace Of Mind
5-Year Warranty
Your new Louisville addition or ADU stays backed after construction wraps, so you can settle into the space with real peace of mind.
What Makes Additions & ADUs Different In Louisville
The Space You Build
Should Feel Like It Always Lived Here
Adding onto a Louisville home means you’re starting with real, specific conditions, a 1980s ranch that’s served your family well but never quite had enough room, a basement with ceiling heights that may or may not clear habitable space minimums, and a permit process that’s actually more predictable than most neighboring cities thanks to Louisville’s May 2024 ADU ordinance. What that clarity doesn’t change is the honest work of assessing your electrical panel, your HVAC, and your plumbing before any design decisions get made, because those systems surface at the permit stage regardless. At Christie’s Design Build, we put the full picture on the table early, lot setbacks, Old Town overlay requirements if they apply, utility feasibility, and construction contingency, so the number you’re working toward is the real one. The goal is an addition or ADU in Louisville, CO that works for your parent today and converts for someone else five years from now without feeling like it was ever an afterthought.
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Louisville Ranches Have Real Character
.02
Louisville's Ranch Bones Set the Starting Point
.03
Louisville's 1980s Systems Need Honest Review
.04
Front Range Weather Demands Thoughtful Material Choices
Louisville, CO Neighborhoods
More Room Without Leaving
the Louisville You've Chosen to Stay In
Coal Creek Ranch
When a Newer Home Still Has Room for the Life Ahead
Cherrywood
Build What's Missing Without Changing What the Street Fell in Love With
Old Town Louisville
When a Beloved Old Home Finally Has Room for Everyone
Centennial Heights
Give the Home You're Staying In the Space It's Always Needed
Rock Creek Ranch
Make the Home That Already Fits You Work for the Long Run
Our Louisville Additions & ADU Process
From the First Conversation to the Day It Feels Like Home
Adding an addition or ADU in Louisville brings questions that are specific to this city and the home already standing on your lot, the 1980s electrical panel that needs upgrading before a secondary unit can be permitted, the basement ceiling that may fall just short of habitable height, the Old Town historic overlay that adds a distinct layer of review for properties in that district. A ranch near Old Town Louisville calls for a very different conversation than a newer home in a planned subdivision. Our process moves each project through site evaluation, design, permitting, utility coordination, construction, and final walkthrough with one team keeping the whole picture clear from start to finish.
.01
Site & Structure Review
.02
Goals & Design Direction
.03
Detailed Project Planning
.04
Permits & Trade Coordination
.05
Construction & Communication
.06
Final Review & Completion
Our Louisville Additions & ADU Process
From the First Conversation to the Day It Feels Like Home
Adding an addition or ADU in Louisville brings questions that are specific to this city and the home already standing on your lot, the 1980s electrical panel that needs upgrading before a secondary unit can be permitted, the basement ceiling that may fall just short of habitable height, the Old Town historic overlay that adds a distinct layer of review for properties in that district. A ranch near Old Town Louisville calls for a very different conversation than a newer home in a planned subdivision. Our process moves each project through site evaluation, design, permitting, utility coordination, construction, and final walkthrough with one team keeping the whole picture clear from start to finish.
.01
Site & Structure Review
.02
Goals & Design Direction
.03
Detailed Project Planning
.04
Permits & Trade Coordination
.05
Construction & Communication
.06
Final Review & Completion
What Louisville Homeowners Want From Their Addition or ADU
More Room for the
Next Twenty Years
Space for Parents, Everyone
Space Built to Stay
In Louisville's established neighborhoods like Old Town and the South Boulder Road corridor, most homes were built for households a fraction of today's size, and without the multigenerational configurations families now need. A thoughtful addition or ADU can create a private suite for aging parents, give an adult child genuine independence, or open a main living area that's felt too tight for years.
Plans That Flex Over Time
Room for the Long Haul
Many Louisville ranches are still carrying the same floor plan they had in 1983, and it shows. Reconnecting old and new space thoughtfully, with real flow and no awkward transitions, is where these projects start feeling like home again.
Organized Systems, Finally
Their Own Key, Finally
Louisville's modest lot sizes mean a well-planned addition has to work harder than just adding square footage. Built-in storage, a mudroom drop zone, and smart laundry placement make the finished space feel calmer and genuinely easier to live in.
Close By, Genuinely Independent
Near, Without Feeling Crowded
For homeowners near Old Town Louisville and the Centennial neighborhood, a permitted ADU or in-law suite can make multigenerational living feel genuinely sustainable rather than improvised. A private entrance, full kitchen, and no-step bathroom change everything about how the whole arrangement feels, for everyone involved.
Matched to Louisville Homes
Built for Louisville's Real Life
Louisville additions have to hold up against freeze-thaw cycles, hail seasons, and the energy code requirements that come with Colorado's altitude, none of which are optional at the permit stage. Exterior cladding, insulated envelope details, and interior finishes chosen for real Front Range conditions keep the new space performing exactly the way it should, year after year.
What To Consider When Building An Addition or ADU In Louisville
Make Room for the Life
Louisville Already Gave You
Who is this space really for, and will that answer change in five years?
What does your existing home actually have to offer, and what's it hiding?
Have you mapped out the full timeline, not just the construction phase?
Does your block, your lot, or your HOA add a layer you haven't thought through yet?
Our Reviews
Trusted by Louisville Homeowners
With the Spaces Their Families Come Home To
Areas We Service Across Louisville
Your Louisville Home,
Built for the Long Haul
- Old Town Louisville
- Coal Creek
- Centennial Valley
- Harper Lake
- Hillcrest
- North End
- South Boulder Road Corridor
- McCaslin
- Louisville Heights
- Steel Ranch
- Bella Vista
- Davidson Mesa
Other Areas We Service
Weld County
Boulder County
Adams County
Jefferson County
Broomfield County
Larimer County
Louisville Addition & ADU Frequently Asked Questions
The Questions Behind
Staying in Louisville and Making It Work
Does Louisville's May 2024 ADU ordinance actually make it easier to build an ADU on my property?
Our home was built in the 1980s. What should we expect to uncover when we start an ADU or basement conversion project?
We're building the ADU for my mom right now, but we want it to work as a rental in five years. Can it really do both?
We live in Old Town Louisville. Does the historic district overlay change what we can build?
Our HOA has a lot of rules. Can they actually stop us from building an ADU?
How long will this actually take from our first conversation to the day someone can move in?
We've seen low per-square-foot figures online. Why does a real ADU project cost more than that?
Is a garage conversion really a simpler path to an ADU, or is that just how it seems at first?
Start The Conversation
Room to Stay
in the Louisville Home You've Chosen
Our Other Remodeling Services
From The Blog
Your Louisville Ranch
Has Room for the People Who Need It

