Home Additions in San Diego, CA
Home Additions for San Diego homes, priced clearly and built properly.
How we handle home additions
When the house is short on space and you like where you live, an addition is often the answer.
We plan it to match the rooflines and finishes you have, take care of drawings and permits, and build it from the ground up.
About 48% of San Diego homes are owner-occupied, and the median home value is around $848,500, which makes a remodel done properly worth the planning.
What is included
Design and engineering
Drawings, structural engineering and a plan that matches the house.
Permits and zoning
Setbacks and lot coverage checked, with permits and inspections handled.
Build and tie-in
Foundation, framing, roof and utilities joined to the existing home.
Home Additions cost in San Diego
What these items usually cost in California, labor included.
| Item | Typical price | Unit |
|---|---|---|
| Room addition | $170–$440 | per sq ft |
| Second-story addition | $280–$560 | per sq ft |
| Design and permit drawings | $2,200–$16,700 | per project |
| Adding a bathroom | $16,700–$38,900 | each |
Use these to plan a budget. The real number comes from a visit and a written quote. Try the cost calculator.
Sources: Remodeling magazine Cost vs Value Report 2025 (additions and remodels); HomeAdvisor and Angi addition, basement, garage conversion and ADU cost guides (2024–2025); Fixr and HomeGuide renovation cost guides (2025); state price level from BEA Regional Price Parities 2024.
Done once, done right
Remodeling shortcuts hide behind drywall: undersized beams, missing insulation, wiring that was never inspected.
Get it right once and you will not be opening the walls again in a few years.
Benefits
- Drawings where the project needs them
- One point of contact
- Clear scope and price up front
- Measured and planned before ordering
- A typical room addition takes about 3 to 6 months of construction, plus time for design and permits.
Our home additions process
Reach out
Call or send the form, with photos if you have them.
See it in person
A walkthrough to check framing, wiring, plumbing and what the rules allow.
Plan and written quote
A scope, drawings where needed and a line-by-line price.
Permits and schedule
Approvals in hand and a start date confirmed.
Construction
The work done in order, with inspections at each stage.
Final walkthrough
Final inspection, punch list and a walkthrough with you.
Good to know
Building up is usually pricier per square foot than building out, because the existing structure may need reinforcing.
Additions that include a bathroom cost noticeably more per square foot than bedrooms or living rooms.
New living space, conversions of garages, basements or attics, and any structural, electrical or plumbing changes typically need permits and inspections; cosmetic updates usually need none. Additions and ADUs must also meet local zoning rules such as setbacks. The City of San Diego Development Services Department issues building permits for addresses inside city limits. Questions go to the City of San Diego Development Services Department.
Related services
Where we offer home additions
San Diego and nearby: Coronado, Mira Mesa, La Presa. See all service areas.
Home Additions: common questions
How much do home additions cost in San Diego?
Typical California prices: room addition $170–$440 per sq ft; second-story addition $280–$560 per sq ft; design and permit drawings $2,200–$16,700 per project. Your quote depends on the size of the job and the materials you pick.
How long does home additions take?
A typical room addition takes about 3 to 6 months of construction, plus time for design and permits.
Do I need a permit to remodel in San Diego?
New living space, conversions of garages, basements or attics, and any structural, electrical or plumbing changes typically need permits and inspections; cosmetic updates usually need none. Additions and ADUs must also meet local zoning rules such as setbacks. The City of San Diego Development Services Department issues building permits for addresses inside city limits. Questions go to the City of San Diego Development Services Department.
Does a remodeling contractor need a license in California?
In California, any job of $1,000 or more in labor and materials, or any job that needs a permit, must be done by a CSLB-licensed contractor. The limit was $500 until AB 2622 raised it in 2025. A CSLB license lookup takes a minute and shows whether the license is active and bonded.
What does it cost to take out a wall?
It depends on what the wall holds up and what runs inside it. Load-bearing walls need a beam and a permit; walls with plumbing or ductwork cost more to remove.
How do I get an accurate quote?
Book a site visit. We measure, check structure and systems, talk through options and send a written, line-by-line quote.
Get a clear price for your project
One visit gets you measurements, options and a line-by-line price.
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