Accessory dwelling units and guest houses
ADU Builder in Boise, ID
★★★★★5.0 on Google
A guest house, a place for family or a rental, built on your property with the same care as your main home.
(208) 999-6446
Get Your Free Estimate
Mike usually replies the same day or the next.
More Room for the People You Love
An accessory dwelling unit, or ADU, gives you a separate living space on your property for aging parents, adult kids, guests or rental income.
We build ADUs from the ground up and convert existing spaces, managing the plans, permits and trades so the project stays on track.
ADU Options
Planned around your property and how the space will be used.
Detached ADUs
A separate small home in the backyard with its own entrance.
Attached ADUs
A unit connected to your home with its own living space.
Garage Conversions
Turn part of a garage into a finished living space.
Guest Houses
A private place for visiting family and friends.
Rental Units
A unit designed for long-term rental income.
Plans, Permits & Trades
Mike manages the plans, permits and licensed trade partners.
One Builder for the Whole Project
An ADU is a small home, so it involves foundations, framing, roofing, plumbing, electrical and finishes.
Mike manages every part of it, bringing in trusted trade partners where needed, so you have one builder accountable from the first drawing to the final walkthrough.
✓Plans and permits handled
✓Trades coordinated
✓Matched to your property
✓One point of contact
Related Project
A look at recent work by Mike and his crew.
Three-Car Garage in Prairie
GaragePrairie, ID
A 964 sq ft, three-bay attached garage on a remote site, with siding matched to the house.
See the full projectHow It Works
A clear plan from the first visit to the final walkthrough.
1
Visit & design
Mike visits, looks at the space and talks through the ADU you have in mind.
2
Plan & estimate
You get a clear plan and a transparent estimate, and we handle any permits.
3
Build
We build it with care, with regular updates and a clean site every day.
4
Final walkthrough
We walk through the finished work with you and make sure it’s exactly right.
Why Choose Kemsley
01
Owner on Every Job
You work directly with Mike, from the first visit to the final walkthrough.
02
Honest Pricing
A clear estimate up front and no surprises once the work starts.
03
Clear Communication
You’ll always know the schedule and where things stand.
04
Respect for Your Home
We protect your property and clean up the site every day.
05
Right the First Time
Careful, quality workmanship that’s built to last.
“He is professional, knowledgeable, friendly and works well with others! He’s great with the customers.”
Beth Netto, White Mountain Plumbing LLC
Frequently Asked Questions
How much does an ADU cost?
It depends on the size, materials, design and site conditions. After a quick visit to look at the space and talk through your goals, we’ll give you a clear, itemized estimate.
Can I build an ADU on my property?
It depends on your lot, zoning and local rules. We’ll look at your property and help you understand what’s allowed before you commit.
Can you convert my garage into an ADU?
Often, yes. Converting existing space can be a cost-effective way to add a unit. We’ll check the structure and what’s needed to meet code.
How long will the project take?
It depends on the size of the project, permits and when materials arrive. Once the plan is set, we’ll give you a realistic schedule and keep you updated along the way.
Do you handle the permits?
Yes. When your project needs a permit, Mike prepares the plans and handles the city approvals before construction begins.
Proudly local, family owned
Your Neighbors in the Treasure Valley
Kemsley Construction is a family-owned builder based in Boise, ID. Being local means Mike knows the city codes, the permit offices and what Idaho weather does to a build, and he’s never far from your project, from the first visit to the final walkthrough.
Boise
Meridian
Eagle
Kuna
Star
Nampa
Caldwell
And the wider Treasure Valley.
Ready to plan an ADU?
Tell Mike about your project. He usually gets back to you the same day or the next, and can come out to look at the space and talk through options.
Prefer to talk?
Call Today
(208) 999-6446
Monday to Friday, 7 a.m. to 7 p.m.
Get Your Free Estimate
Mike usually replies the same day or the next.