ADU
Adding an ADU to your property is one of the smartest ways to create rental income, house aging parents, or give adult kids a place of their own. But the hardest part isn’t the framing or the drywall. It’s trusting a crew with your home, your property, and a six-figure investment. Threshold Group solves that first. Every ADU professional we send is background-checked, identity-verified, and introduced to you by name and photo before they step onto your driveway. One written price. One 365-day guarantee. A team you actually know.
What’s Included
Every ADU project draws on a specific set of trades, and Threshold Group’s family of brands handles each one under the same verified standard. Here’s what our crews handle most often.
Detached ADU Construction
A standalone unit in the backyard gives you full separation, which most tenants and in-laws prefer. We handle site prep, foundation, framing, siding, roofing, and interior finish. Because we work with recognized ADU product lines like Abodu, Dvele, and Cover, we can often shorten the timeline by pairing prefabricated components with local on-site work. Your written price covers the entire build before we break ground.
Garage Conversions
That two-car garage might be the fastest path to a rentable unit. We convert existing garages into permitted living spaces, handling insulation, drywall, electrical, plumbing, flooring, and the all-important bathroom addition. Many Sacramento-area garages were never built with ADU code requirements in mind, so we bring the structure up to current standards rather than just cosmetically finishing it.
Attached ADUs and Home Additions
Sometimes the best ADU shares a wall with the main house. Attached units cost less per square foot because they borrow structure, and they’re easier for an older parent to move between. We build them with proper fire separation, soundproofing, and independent entrances so both households keep their privacy.
Prefab and Panelized ADU Installation
Factory-built units from Mighty Buildings, Plant Prefab, and Boxabl arrive with much of the structure complete, but the site work matters enormously. Foundations, utility connections, permitting, and finishing all need a local crew that understands the products. Sutton ADU Builders, our family’s ADU specialist, has authorized experience with these systems and knows which ones suit specific lots.
Tuff Shed and Backyard Structure Conversions
A Tuff Shed is a shell, not a home. Converting one into a legal ADU means adding insulation, electrical service, plumbing for a kitchenette or bath, and often structural reinforcement. We have done dozens of these conversions and we’ll tell you honestly whether your existing shed is worth the investment or if starting fresh costs less.
ADU-Specific Electrical, Plumbing, and HVAC
An ADU needs its own subpanel, water lines, sewer tie-in, and climate control. Our family’s electrical and plumbing brands handle that scope under the same verification standard as the builders. The result is one accountable team instead of three subcontractors you’ve never met.
Why Homeowners Choose the Threshold Group Family
Threshold Group is twelve home-service brands united by one promise: you always know exactly who is at your door. The name itself comes from the step you cross to come inside, and for centuries that step has meant trust. Who you welcome past it, and who you keep on the other side. We take that seriously. Every technician is background-checked and identity-verified, wears a clean marked uniform, and shows a photo ID badge at the door, every time. Before anyone arrives, you receive their name and photo. If someone shows up who you were not told to expect, that visit is on us and we make it right. Then there’s the 365-Day Done Right Promise from Sutton ADU Builders, our ADU specialist: a written guarantee covering completed work for a full year. If it isn’t right, Sutton makes it right. And the price is always in writing before a single tool is lifted. No surprise invoices, no scope creep slipped silently onto the bill.
Frequently Asked Questions
Most ADU projects begin with a site visit and a written proposal within one to two weeks of your first call. The full timeline depends on permitting, which in many Northern California cities takes three to six months, and on whether you choose a site-built or prefab unit. Call us and we’ll map out an honest schedule for your specific property.
We serve homeowners throughout the greater Sacramento region and the surrounding communities. Each Threshold Group location is an independent local business that agreed to work to Threshold Verified standards, which means you get a local crew that knows your city’s codes, plus the accountability of a larger family of brands behind them.
No. You receive a written price before any work starts, and that price is the price. We walk the site first, ask the right questions, and factor in everything we can see. If hidden conditions force a change, we bring it to you in writing before proceeding. Nothing gets tacked on silently at the end.
The 365-Day Done Right Promise covers the completed work for one full year from completion. If a repair or element of the build fails within that year, we come back and fix it. You also get a free second visit if needed. No haggling, no fee. It’s a named, written guarantee stamped on your project documents, not a verbal assurance.
Written by the team at Sutton ADU Builders, serving Northern California homeowners since 2006 as part of the Threshold Group family.
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