ADU Construction
Accessory dwelling units built from permit to punch list — detached, attached, and DADU options for Seattle lots.
View serviceGarage Conversions in Seattle Garage conversions that add real living space
Office, studio, ADU, or gym — permitted and finished right.
Turn underused garage space into a home office, gym, studio, or ADU — permitted and finished to match your home.
5 out of 5 stars
I'd been working from the dining room table for two years with everyone walking through and finally decided to do something about our unused single-car garage. Marco laid out exactly what we'd get — spray foam, mini-split, fiber conduit, new windows — and came in on budget and on time. It's now the best room in the house.
Riley S.
Columbia City
What we do
Garage conversion services
More useful space from what you already have.
- Garage-to-ADU
- Convert your garage into a permitted, rentable accessory dwelling unit with a full kitchen, bath, and independent utilities. A garage ADU is often the most cost-effective path to adding rental income in Seattle because the shell structure is already there.
- Home office
- A quiet, properly insulated, well-lit workspace separated from the main home by a door and a few feet of air. We design garage offices to be video-call-ready — good natural light, proper electrical, and fiber conduit as standard.
- Studio or gym
- Creative, fitness, and flex spaces designed for how you actually use them. We pay attention to acoustics, flooring, natural light, and HVAC when converting for these uses — details that matter more in a gym or studio than in a basic office.
- Insulation & HVAC
- Spray foam insulation and a mini-split heat pump for year-round comfort in the converted space. Garage walls typically have no insulation — getting the thermal envelope right is the most important single investment in making a converted garage feel like a real room.
Ready to saddle up?
Get a free estimate and consultation today.
Featured Previous Work
Columbia City Garage Office
A Columbia City single-car garage converted into a home office — insulated, heated, wired for fiber, and finished to match the main house.
Their Story
A rarely-used single-car garage with no insulation, no heat, and poor lighting — wasted space while the homeowner worked from a dining room table.
Insulated walls and ceiling, installed mini-split HVAC, added natural light with new windows, ran fiber conduit, and finished to a clean modern standard.
Read full case study
Overview
- Timeline
- 6 weeks
- Completed
- June 2025
- Location
- Columbia City
Our Process
Consultation & Site Visit
We review your goals, space, and budget and answer initial questions.
Estimate & Scope Review
You receive a clear, written estimate with defined scope and expectations.
Build Phase
We coordinate trades, manage permits if required, and keep the site clean and organized.
Final Walkthrough
We review details with you and make sure everything is completed properly.
Frequently asked questions
Can't find the answer you're looking for? Give us a call.
- Do garage conversions require permits in Seattle?
- Yes — any conversion to habitable space requires permits. We manage the permitting process as part of our scope.
- Can a garage be converted to an ADU?
- Yes, if it meets Seattle's ADU requirements. We'll assess your garage and lot during planning.
- Will I lose parking?
- That depends on your lot and Seattle parking requirements. We'll walk through the options with you.
- What does a garage conversion typically cost?
- A basic garage-to-office or gym conversion typically runs $40K–$80K depending on insulation, HVAC, electrical, and finishes. A full garage-to-ADU conversion is more involved and typically runs $100K–$200K+ depending on plumbing and kitchen scope.
- How do you insulate and heat a converted garage?
- We use spray foam insulation for the tightest thermal envelope, and a mini-split heat pump for efficient year-round heating and cooling. This combination is what makes a converted garage genuinely comfortable in Seattle winters.
Service Areas
Serving the Greater Seattle Area
From Snohomish County to Federal Way, if you need help call Saddle & Spur Construction today.
- Seattle
- Ballard
- Fremont
- Greenwood
- Phinney Ridge
- Wallingford
- Queen Anne
- Magnolia
- Capitol Hill
- Eastlake
- Ravenna
- Madison Park
- West Seattle
- Beacon Hill
- Columbia City
- Rainier Valley
- Northgate
- Shoreline
- Lake Forest Park
- Kenmore
- Bothell
- Mountlake Terrace
- Bellevue
- Kirkland
- Redmond
- Sammamish
- Issaquah
- Mercer Island
- Newcastle
- Renton
- Kent
- Tukwila
- Burien
- SeaTac
- Des Moines
- Federal Way
- Covington
- Maple Valley
- Auburn
- Lynnwood
- Edmonds
- Mukilteo
- Mill Creek
- Everett
- Marysville
- Lake Stevens
- Monroe
Related expansion services
Homeowners planning this usually look at these too — and they're cheaper to build at the same time than to add later.
Home Additions
Room additions and second-story expansions that tie seamlessly into your existing home — engineered, permitted, and built to last.
View service
Basement & Attic Conversions
Attics, basements, and underutilized rooms transformed into livable, functional space — permitted and finished properly.
View serviceWe built our business on clear communication and quality work
Home remodeling works best when expectations are clear and communication is consistent. We focus on being responsive, transparent about scope and pricing, and respectful of your home from start to finish — so there are no surprises along the way.
Clear, upfront estimates
You'll receive a detailed estimate that outlines scope, materials, and next steps, so you know exactly what to expect before work begins.
Licensed, insured, and code-compliant
All work is performed by a licensed and insured general contractor and built to meet current codes and local requirements.
Clean, professional job sites
We work in occupied homes and condos and take care to keep the site organized, safe, and respectful of your space.
Seattle's Trusted Residential Contractor
Your No-Nonsense Partner in Exceptional Construction. Licensed & Insured.