Major Renovations · Property Services

Room Addition / ADU

New square footage — a bedroom, home office, or full ADU — is ground-up construction that always requires a verified-licensed general contractor, from foundation through finish. NorTech connects you with a verified B-licensed contractor for the entire build.

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Room additions and ADUs across the Bay Area

With ADU demand high across the Bay Area for both rental income and multigenerational living, a room addition or full ADU is one of the largest projects on the platform — and one that always requires a verified B general-building license given the foundation, framing, and full trade coordination involved. NorTech verifies that license before a contractor can be booked to design, permit, and build the addition.

What's included in a room addition or ADU build

The scope covers design and permitting, foundation and framing, roofing tie-in to the existing structure, plumbing and electrical rough-in, insulation and drywall, and interior finish. Because additions and ADUs involve significant permitting (and in many Bay Area cities, specific ADU regulations), your verified contractor manages that process as part of the build rather than leaving it to you to navigate.

ADU rules vary significantly by city

Bay Area cities have adopted different local rules on top of California's statewide ADU legislation — setback requirements, size caps, and parking rules can vary meaningfully from one city to the next. Confirming your specific property's zoning and ADU eligibility is real work your contractor handles during the design and permitting phase, not something to assume based on a neighbor's project.

When to book room addition / adu

You need a bedroom, office, or living space the current floor plan doesn't have

You're building an ADU for rental income or a family member

Your household has outgrown the home's existing square footage

You've confirmed zoning allows an addition and are ready to move to design

You want one contractor accountable for the whole build, not separate trades

90-Day Warranty

Backed by your provider’s warranty. If covered work fails, your provider makes it right — free.

Frequently asked

Room Addition / ADU — common questions

Yes — design and permitting is the first phase of the scope, handled by your verified contractor before construction begins.

It varies significantly by size and local permitting timelines; your contractor will walk through a realistic schedule during design.

Confirming your property's specific zoning and ADU eligibility is part of the design and permitting phase.

A workmanship warranty covers the addition, from the foundation and framing to the roofing tie-in and the finishes. Covered work that is not right inside the warranty window is made right at no charge.

Once permitted and finaled by inspection, most ADUs can be rented; your contractor can confirm any city-specific requirements that apply.

Pricing begins with design and permitting. The contractor measures, confirms what your city allows, and fixes the scope, including size beyond 200 square feet, the foundation type and whether a bathroom is included. The price comes out of that plan before construction starts.

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