San Diego’s Trusted ADU Design-Build Firm
Home Services Plus specializes in building fully permitted, move-in-ready ADUs across San Diego County — whether you’re planning a luxe guest house in La Jolla, a rental-ready unit in Clairemont, or a hillside build in Carlsbad. We handle every step from permitting to keys-in-hand, and our streamlined prefab + custom model means you get top-tier design with zero builder headaches.
Detached ADUs (Backyard Homes)
From modern casitas with vaulted ceilings to classic guest cottages, we design and build detached ADUs up to 1,200 sq ft — complete with full kitchens, baths, and independent utilities. Ideal for multigenerational living, passive rental income, or future resale value.
Prefab ADUs
Our prefabricated ADUs start at $189,000 and include curated finish palettes, optional upgrades, and accelerated construction timelines. We manage all site prep, foundation, utility tie-ins, and local permitting — you get a fast, turnkey solution with style.
Garage Conversions (JADUs)
Turn unused garages into junior ADUs with modern layouts, legal kitchenettes, and fully insulated interiors. Great for downsizing parents, home offices, or short-term rental setups in areas like North Park or City Heights.
ADA-Compliant & Aging-in-Place ADUs
Need accessibility? We design ADUs with ramps, wider doorways, roll-in showers, grab bars, comfort-height toilets, and open floor plans — all ADA-compliant and perfect for aging in place or caregiving setups.
Why San Diego Clients Choose Us for ADU Builds
Our ADU Building Process
Consultation & Site Review
We evaluate your property, assess zoning, and help you choose the best ADU path — detached, garage conversion, or prefab.
Design & Planning
We prepare full construction drawings, 3D visuals, finish selections, and preliminary cost breakdowns. You choose what fits your budget and goals.
Permits & Engineering
Our in-house permit team handles coastal reviews, hillside engineering, and city/HOA approvals. No back-and-forth headaches.
Site Prep & Utilities
We coordinate excavation, utility tie-ins, and foundation work with minimal disruption to your existing home.
Construction & Finishing
Our licensed crew completes framing, roofing, electrical, plumbing, interior finishes, and final punch. We build fast, clean, and code-tight.
Final Walkthrough & Move-In
You inspect the space. We handle final inspections and provide warranty documentation. Your ADU is move-in ready.
ADU Costs in San Diego
Here’s a breakdown of typical project costs based on 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 offer flexible options for homeowners and investors — from full custom builds to value-engineered prefab kits.
Our San Diego ADU Portfolio
What Our San Diego ADU Clients Say
Meet the Team Behind San Diego ADU Builds
Visit Our San Diego Showroom
Home Services Plus – San Diego Showroom
Start Your ADU Project Today
Let’s turn that empty yard or unused garage into something smart, stylish, and income-generating. Schedule your free consultation today.
Frequently Asked Questions
Prefab ADUs use pre-designed shells with limited modifications. They’re faster to build and more affordable. Custom ADUs, on the other hand, are fully tailored but take longer to permit and build.
Vaulted ceilings, custom finishes, folding glass doors, smart HVAC, and a kitchen that mirrors the main home are typical luxury ADU features. These details create a guest house that feels like a true extension of your house, not an afterthought.
Design and permitting typically take 3 to 5 months, with construction adding another 4 to 6 months. Choosing prefab can reduce both stages by roughly 30%.
Yes — prefab ADUs offer faster build times and better cost predictability. The trade-off is some limitation in rooflines, layouts, and finish customization compared to fully bespoke builds.