Concord’s Trusted ADU Design-Build Experts
At Home Services Plus, we deliver fully permitted, move-in-ready ADUs designed to fit your property and lifestyle. From luxury guest houses to rental-ready units and backyard additions, our team oversees the entire process — permits, construction, and final walkthrough. With our efficient prefab-plus-custom approach, you get premium design and quality craftsmanship without the stress of managing multiple contractors.
Detached ADUs & Backyard Homes
From modern casitas with vaulted ceilings to charming guest cottages, we build detached ADUs up to 1,200 sq. ft. Complete with full kitchens, bathrooms, and independent utilities, these units are perfect for extended family, rental income, or boosting resale value.
Turnkey Prefab ADU Solutions
Our prefabricated ADUs are designed for efficiency and style, with curated finishes and customizable upgrades. Priced from $189,000, these units include everything — site preparation, permitting, utilities, and a streamlined construction process.
Smart Garage-to-ADU Solutions
Maximize your property’s potential by converting garages into comfortable junior ADUs. With full insulation, efficient layouts, and compliant kitchenettes, these spaces are tailored for flexible living.
ADA-Compliant ADU Construction
Our accessible ADUs feature thoughtful designs for safety and independence, with barrier-free showers, widened entries, and supportive fixtures. Perfect for seniors, multigenerational living, or caregiving needs.
Building ADUs Concord Homeowners Rely On
The Proven ADU Construction Process
Initial Consultation & Lot Review
We begin by assessing your property, reviewing zoning requirements, and helping you determine the right ADU option — detached, garage conversion, or prefab.
Design Development & Planning
Our team prepares detailed construction drawings, 3D renderings, curated finish selections, and a transparent cost breakdown to match your vision and budget.
Permits & Engineering Approvals
We take care of permits, engineering, and all necessary city or HOA approvals, ensuring your project moves forward without unnecessary delays.
Site Prep & Utility Setup
From excavation and foundation work to utility connections, we handle all site preparation while minimizing disruption to your existing home.
Build & Interior Completion
Our licensed experts manage framing, roofing, plumbing, electrical, and finishing touches — delivering a clean, efficient, and fully code-compliant build.
Final Inspection & Handover
We complete all final checks, walkthrough the new space with you, and provide warranty documentation — ensuring your ADU is move-in ready from day one.
ADU Costs in Concord
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 solutions for both homeowners and investors — from fully customized builds to budget-friendly prefab options.
See Our ADU Projects in Concord
Hear From Our ADU Clients in Concord
The Experts Behind ADU Construction in Concord
Visit Our Concord Showroom
Home Services Plus – Concord Showroom
Start Your ADU Project Today
Transform your unused garage or backyard space into a stylish, functional ADU that adds value and income potential. Schedule your free consultation today.
Frequently Asked Questions
Prefab ADUs are quicker and more cost-efficient, offering standardized layouts and finish packages. Custom ADUs give you complete design flexibility and property-specific solutions, though they involve a longer planning and building process.
High-end ADUs feature details like modern smart systems, custom cabinetry, premium flooring, spa-style bathrooms, and architectural elements that match the main home — transforming them into true extensions of your property.
From design through completion, most luxury ADUs require 7–11 months. Prefabricated options provide a quicker path, trimming timelines significantly.
Prefab ADUs deliver speed and cost control, making them an attractive option for many homeowners. However, they come with limitations in design customization versus a fully tailored unit.