Additions & New Construction in San Francisco, Designed for What’s Next
Whether it's a second story, a rear addition, or a ground-up rebuild, adding to a San Francisco home is an entitlements project as much as a construction one — Planning review, neighborhood notification, and a structural set the framing has to answer to. We design what's approvable and build it under one roof, from feasibility through SF DBI permitting to final inspection.
Who This Service Is For
Homeowners Ready to Expand
You love your neighborhood and your lot — you just need more house. You want the addition designed to belong on the block and built to the same standard as the home it’s joining.
Growing Families
The family has outgrown the floor plan and moving isn’t the answer. You need bedrooms, a better kitchen, real outdoor space — added in a way that’s permitted, structurally sound, and finished to match.
Real Estate Investors
You’re adding square footage to add value, on a pro forma that depends on clean entitlements and an on-schedule build. You want a builder who can navigate SF Planning and deliver.
SIGNATURE MOMENTS
What separates a true addition from a cosmetic renovation.
Structural integration
Plumbing, electrical, and HVAC designed together — not retrofitted room by room. Systems that work as a single home.
Permit-first design
Every addition starts with a buildable permit set. We don't design what we can't build. Zoning, setbacks, and structural requirements are confirmed before design begins.
Single-team delivery
One GC. One point of contact. No finger-pointing between trades when something needs resolution.
ENGAGEMENT MODEL
Three phases. Every addition. No handoffs.
Flat-fee at every phase. You know the total investment before work begins.
PHASE 01
Discovery
We assess your entire home — structure, systems, layout — and align the scope to how your household actually lives.
PHASE 02
Design
Architectural and structural design coordinated with your existing home. Engineering, MEP planning, and finish selections resolved before permit filing.
PHASE 03
Construction
Foundation through finishes, managed by one team. You stay informed at every milestone through final inspection and certificate of occupancy.
Second-Story Addition
Adding a full new floor to your existing home. New bedrooms, bathrooms, and living space — structurally integrated with the original build. Permits, engineering, and construction under one team.
Single-Story Room Addition
Expanding your home’s footprint with a new room or suite. Primary bedrooms, home offices, and family room expansions — designed to match your existing architecture and built under one contract.
Ground-Up New Construction
Full demolition and rebuild on an existing lot, or building on a vacant parcel. New foundation, framing, MEP systems, and all finishes — delivered under one design-build contract.
Attached Structure & Garage Addition
Adding living space above or adjacent to an existing garage or structure. Flex space, guest suites, and home office additions that maximize your lot without a full footprint expansion.
The Old Way
- Separate designer and contractor
- Unclear budgets and change orders
- Delays caused by poor coordination
- Limited accountability when problems arise
Our Design-Build Approach
- One integrated team from concept to completion
- Clear scope, transparent pricing, and realistic timelines
- Fewer delays and better communication
- Full responsibility for design, permits, and construction
Why an Addition Is Worth It
Increase Property Value
A well-built new home or addition is the highest-value move on an SF lot — but the value is in the entitlements, the structure, and the build quality, not a glossy rendering.
Improve Daily Functionality
A home designed around how you actually live, on a plan that fits the lot and the light — the difference between a house that works and one you adapt to.
Modernize the Look and Feel
A cohesive, considered home built to one standard — current architecture detailed to last, not a trend that dates before the paint dries.
PROCESS AT A GLANCE
One team. One timeline.
Every trade coordinated under one contract. No gaps, no handoffs.
STAGE 01
Discovery
2–4 weeks
Site assessment, zoning review, structural feasibility, scope alignment.
STAGE 02
Design
6–12 weeks
Architectural design, structural engineering, MEP planning, material selections.
STAGE 03
Permit
3–8 weeks
Permit drawings, structural and MEP approvals, city submission.
STAGE 04
Build
4–12 months
Foundation, framing, rough-in, exterior, interior finishes through certificate of occupancy.
What to Expect During a New Addition Remodel
Additions and new construction in San Francisco are major permits — usually Planning review and neighborhood notification before a structural permit set with SF DBI. Expect several months of design and entitlements before construction, then months of build. We map the real, milestone-by-milestone timeline in feasibility.
What Impacts the Cost of a New Addition Remodel
- One integrated team from concept to completion
- Clear scope, transparent pricing, and realistic timelines
- Fewer delays and better communication
- Full responsibility for design, permits, and construction
- One integrated team from concept to completion
- Clear scope, transparent pricing, and realistic timelines
- Fewer delays and better communication
- Full responsibility for design, permits, and construction
Professional Tips
Increase Property Value
A well-built new home or addition is the highest-value move on an SF lot — but the value is in the entitlements, the structure, and the build quality, not a glossy rendering.
Improve Daily Functionality
A home designed around how you actually live, on a plan that fits the lot and the light — the difference between a house that works and one you adapt to.
Modernize the Look and Feel
A cohesive, considered home built to one standard — current architecture detailed to last, not a trend that dates before the paint dries.
Increase Property Value
A well-built new home or addition is the highest-value move on an SF lot — but the value is in the entitlements, the structure, and the build quality, not a glossy rendering.
Improve Daily Functionality
A home designed around how you actually live, on a plan that fits the lot and the light — the difference between a house that works and one you adapt to.
Modernize the Look and Feel
A cohesive, considered home built to one standard — current architecture detailed to last, not a trend that dates before the paint dries.
What Our Clients Say
Over 150 five-star reviews
Over 85 five-star reviews
Over 20 five-star reviews
We Do Construction, Inc.
Featured New Addition Projects
Recent San Francisco additions and ground-up work — second stories, rear additions, and full rebuilds across the city’s varied lots and grades.
Areas We Serve
Serving San Francisco and Surrounding Areas
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FAQ
Yes — additions and new builds usually need Planning review and neighborhood notification before a structural permit set with SF DBI. We manage the entitlement, file the permits, and carry the job through every inspection.
Yes — before design, we look at whether your foundation and framing can carry a second story or addition, and what it would take if they can’t. That feasibility read is where an honest budget starts.
Not always — it depends on the existing foundation and framing, the SF Planning Code’s height and setback limits, and your neighbors’ light. We tell you early whether a second story is realistic on your lot.
Plan on several months of design and entitlements, a structural permit review, and several months of construction — often a year-plus door to door. We give you the real schedule in feasibility, not a guess.
For a second story or major addition, often for part of it — we phase the work and tell you honestly when the house is and isn’t livable. Some single-story additions can be built with the family in place.
It depends on size, structural difficulty, and finish level. Adding onto an existing home and building ground-up are different numbers, and a hillside lot is different again. We price it out of a real feasibility study, not a webpage.
Yes — architecture, engineering, entitlements, and construction sit under one contract. Designing to what SF Planning will approve, then building it, is the whole point of one accountable team.
We start with a feasibility study of your home and lot, then put a fixed proposal in writing — what design, entitlements, structure, systems, finishes, and contingency cover — before construction.
How much does it cost to build a new home in San Francisco?
Ground-up new construction in San Francisco generally runs $500–$900+ per square foot in 2026 — a 3,000 sq ft home commonly lands between $1.5M and $2.7M+ for design-build work, before land. The range reflects SF labor, hillside and soils conditions, Title 24 and SF Green Building requirements, and finish level. We Do Construction (CSLB #1096552) designs and builds new single-family homes across San Francisco under one contract. [DATA: confirm SF ground-up $/SF and worked example against a sourced 2026 study.]
| Tier | Typical SF $/SF (2026) | Scope |
|---|---|---|
| Standard build | $500–$650/SF | Level lot, conventional framing, designer-grade finishes |
| Custom build | $650–$800/SF | Sloped/complex lot, engineered foundation, custom millwork |
| Estate build | $800–$900+/SF | Deep foundations, structural steel, architectural glazing, full automation |
Cost data: $/SF bands pending a sourced 2026 SF new-construction study [DATA: confirm]. Last updated June 2026.
What permits and approvals does new construction require in San Francisco?
A new single-family home in San Francisco requires both a SF Planning entitlement (and, for many sites, environmental and neighborhood review) and a building permit from the SF Department of Building Inspection (DBI). Entitlement and full building-permit review for ground-up work commonly run several months to over a year combined, depending on lot, zoning, and discretionary review [DATA: confirm a sourced SF entitlement timeline]. Title 24 energy compliance and the SF Green Building Ordinance apply throughout. We Do Construction (CSLB #1096552) manages entitlement, DBI permitting, and construction in-house. Last updated June 2026.