ADU Builders San Francisco
Your San Francisco ADU Contractor
Building an ADU in San Francisco is one of the smartest ways to add space and increase your property’s value. On the other hand, it’s also one of the most complex projects a homeowner can take on. And that’s where we come in.
At Home Services Plus, we specialize in designing and building fully permitted, turn-key ADUs across San Francisco. Want to convert your Bernal Heights garage? Add a backyard cottage in the Sunset? We can do it all, managing every step of your ADU project, including design, permits, construction, and inspections, so you can relax knowing it’s done right.
Detached ADUs (Backyard Homes)
Have some free space? A detached ADU can be the perfect guest house, home office, or rental unit. We design backyard homes that fit your property and complement your house, complete with kitchens, baths, and private entrances. Every build is fully compliant with San Francisco’s zoning and setback rules.
Garage Conversions & Basement ADUs
In a city where every square foot matters, conversions are a smart way to expand. We transform unused garages and basements across the Bay Area into comfortable, code-compliant living spaces, complete with soundproofing, moisture protection, and efficient layouts designed for long-term use.
Prefab ADUs
Looking for something faster or more budget-friendly? Our prefab ADUs combine modern design with quick installation. Choose from curated floor plans and finish palettes that meet San Francisco’s building standards. Our prefabs are ideal for homeowners who want quality, speed, and predictability.
ADUs for Multigenerational Living
More Bay Area families are choosing to keep loved ones close. We build ADUs that give everyone their own space while staying connected with thoughtful layouts, accessibility features, and the comfort of home right next door.
What Sets Our San Francisco ADUs Apart
Our ADU Building Process
Site Evaluation & Consultation
After the initial call, we review your property to understand what’s possible under local zoning and help identify the best ADU option for your space and goals.
Design & Planning
Our design team creates plans and 3D visuals for your review, covering everything from layouts to finishes.
Permitting & Engineering
We handle all city applications, engineering calculations, and inspections. You don’t have to deal with the paperwork or back-and-forth with the building department.
Site Preparation & Utilities
From excavation and utility connections to foundation work, we coordinate everything with minimal disruption to your existing home.
Construction & Interior Finishing
Our licensed professionals handle framing, roofing, plumbing, electrical, and all interior finishes. We deliver a fast, clean, code-compliant build.
Final Walkthrough & Handover
We walk the completed space with you, complete final inspections, and provide warranty documentation — leaving your ADU fully move-in ready.
Typical ADU Costs in San Francisco
Here’s an overview of common project costs by unit size and type:
| ADU Type | Shell Price | Site Work | Permits & Fees | Total Est. Range |
|---|---|---|---|---|
| 600 sq ft (1-Bed) | $189K | $35K | $12K | ~$236K |
| 1,000 sq ft (2-Bed) | $279K | $45K | $14K | ~$338K |
We provide flexible solutions for both homeowners and investors — ranging from fully customized builds to cost-efficient prefab kits.
Our San Francisco ADU Portfolio
What Our San Francisco ADU Clients Say
Meet the Team Behind San Francisco ADU Builds
Visit Our San Francisco Showroom
Home Services Plus – San Francisco Showroom
Begin Your ADU Project Today
Turn your empty yard or unused garage into a smart, stylish, income-generating ADU. Book your free consultation today.
Frequently Asked Questions
Yes. ADUs are fully legal and encouraged under San Francisco’s housing policies. We design and build to meet all local and state regulations, including fire and seismic codes.
Absolutely, and we’ll handle that for you. Permitting can be complex here, but our team manages every step with the city so your project stays compliant.
Design and permitting usually take 3–5 months, with construction running another 4–6 months, depending on the size and complexity. Prefab options can reduce total time by 20–30%.
Yes — prefab ADUs provide quicker construction timelines and more predictable costs. The trade-off is reduced flexibility in layouts, rooflines, and finishes compared to fully custom builds.
