ADU Construction
Accessory dwelling units built from permit to punch list — detached, attached, and DADU options for Seattle lots.
View serviceHome Additions in Seattle Home additions that look like they were always there
Structural, permits, and finishes — one team from design to done.
Room additions and second-story expansions that tie seamlessly into your existing home — engineered, permitted, and built to last.
5 out of 5 stars
We wanted a primary suite but our house is a 1920s Craftsman and we were worried an addition would just look stuck on. Luke brought in all the right details — matching siding profile, the trim style, the roofline tie-in — and the crew executed it perfectly. You genuinely can't tell the addition was added later, which is exactly what we wanted.
Alex B.
Ravenna
- Room additions
- Single-room expansions including family rooms, primary suites, sunrooms, and mudrooms added to your existing footprint. We tie the addition into the existing structure so it reads as part of the original house, not an afterthought bolted on the back.
- Second-story additions
- Full or partial second-story expansions on single-story homes, engineered to carry the new load properly. We assess the existing foundation and first-floor framing before committing to scope — if reinforcement is needed, we include it upfront rather than calling it a change order later.
- Bump-outs
- Smaller square-footage expansions that give a kitchen, bathroom, or bedroom the space it needs without a full addition. Bump-outs typically use cantilevered or extended framing rather than new foundation, which keeps costs down and timelines shorter.
- Structural engineering
- Engineered beam and foundation work required to tie the new addition properly into the existing structure. We work with licensed structural engineers and include their work in our contract, so you have one point of accountability for the whole project.
Ready to saddle up?
Get a free estimate and consultation today.
Featured Previous Work
Ravenna Primary Suite Addition
A 600 sq ft primary suite addition on a Ravenna Craftsman — vaulted ceiling, walk-in closet, and private bath, tied seamlessly into the existing roofline.
Their Story
A 1920s Ravenna Craftsman with only two small bedrooms and a shared bath — no primary suite.
Added a 600 sq ft primary suite to the rear of the home with vaulted ceiling, walk-in closet, ensuite bath, and matching Craftsman exterior details.
Read full case study
Overview
- Timeline
- 5 months
- Completed
- July 2025
- Location
- Ravenna
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.
- How long does a home addition take?
- Most room additions take 3-5 months. Second-story additions typically run 5-8 months depending on scope and permitting.
- Do home additions require permits in Seattle?
- Yes — all structural additions require permits. We manage the permitting process as part of our scope.
- Can you match the existing siding and roofing?
- We work hard to source matching or complementary materials. We'll show you options during the planning phase.
- What structural work is involved in a home addition?
- Most additions require new foundation work, engineered beams to tie into the existing structure, and roofline integration. We include structural engineering in our scope and work with the engineer throughout the build.
- Can you add a second story to a single-story home?
- Yes — vertical additions are more complex than ground-level room additions because they require reinforcing the existing structure to carry the new load. We assess the existing foundation and framing first and give you an honest picture of what's involved.
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.
Garage Conversions
Turn underused garage space into a home office, gym, studio, or ADU — permitted and finished to match your home.
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.