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Home additionsin San Francisco.

Rear additions, bump-outs, added floors and ground-level expansions. Additions tie new structure into an existing building, so foundations, framing, utilities and permits all have to line up. We build them from your architect and engineer's drawings.

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Call us (415) 297-2246 Mon-Fri, 8am-6pm PT

Email Courtney Send Project Details courtney@sfbuildinggroup.com

Rear, side and vertical additions
New structure tied into the existing building
Permits and neighbor notification coordinated with your architect

LicenseCSLB #1106131

Service AreaAll of San Francisco

EstimateFree, on-site

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We take projects that need a contractor: remodels, commercial build-outs, new construction and major repairs.

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The Approach

How we run it.

What sets the plan, the estimate and the schedule for this kind of project.

Built from complete drawings

We price and build from your architect and engineer's plans, so the estimate reflects the actual structure and not a guess.

Tie-ins planned, not improvised

The joints between new and old are where problems start. We plan the sequence for demolition, protection and weatherproofing in advance.

Permits and neighbors handled

We coordinate with your architect on permits, neighbor notifications and correction cycles.

Second-story addition framed and sheathed on a blue house

The Scope

What an addition involves.

An addition is a new building that has to be stitched into an old one. Foundations, framing, the existing exterior envelope, plumbing, electrical and mechanical systems all have to meet the new work, and the existing house is still being lived in or protected while it happens.

We work from your architect's plans and engineer's calculations, price the whole scope in writing, and manage the permits, inspections and sequencing.

Site protection and demolition at the connection points
Foundations and structural framing
Weatherproofing and tie-in to the existing building
Extension of plumbing, electrical and mechanical systems
Windows, doors, insulation and drywall
Interior finishes and exterior cladding to match
Inspections at each stage
Punch list and closeout documents

In San Francisco

Adding on in San Francisco.

Expansions of a residential building commonly go through Planning review and neighbor notification, where light, air, rear-yard open space and the building's character on the street are discussed. Height and setback limits depend on zoning. Your architect confirms the feasibility, and we plan the schedule around the review.

San Francisco lots are narrow and neighbors are close, so access, staging, shared property lines and shoring all need planning. Older buildings may also be screened by Planning for historic significance.

How It Works

How your project moves forward.

See the full process page for what you receive at each step.

Free On-Site Estimate

We review the plans or the concept on site with you and put a written estimate in your hands, with assumptions stated.

Permitting & Planning

We coordinate with your architect and engineer and run permits through SF DBI and Planning, including neighbor notification and correction cycles.

Build & Final Walkthrough

Regular walkthroughs and written updates during construction, punch-list resolution before final payment, and a closeout package.

Where We Work

Home Additions come up in many San Francisco neighborhoods. These pages cover housing stock, permits and typical projects in each area. We work in every neighborhood in the city, listed or not.

Neighborhoods

Other services

The same process applies across everything we build. See the other project types, or the full services overview.

Common Questions

Home Additions FAQ.

Anything else, ask in the form at the top of the page.

Can I add a floor to my house?

It depends on the zoning height limit, Planning review, and what the existing structure and foundation can carry. The first step is a feasibility review with an architect and engineer. We can talk through what that involves.

Will my neighbors be notified?

Expansions often trigger neighbor notification, with a window in which neighbors can raise concerns. Your architect plans for it, and we build the schedule around the review.

Do you design the addition?

We build from your architect and engineer's drawings. We coordinate with them during the permit phase and construction.

Can we live in the house during construction?

Sometimes, depending on where the addition ties in and which systems are affected. We discuss the sequence and the points where utilities or rooms are out of service before work starts.