Duplex & Multi-Family Plans · San Francisco, CA
Duplex House Plans in San Francisco, CA
Looking to buy duplex house plans in San Francisco, CA? HousePlans USA draws duplex and multi-family plans from scratch for the San Francisco, CA area. Two or more designers sketch concepts for your lot, you pick your favorite, and permit-ready plans arrive in as little as 24 hours.
From $1,050 · free customization · 30 days of free revisions · pay 75% to start
Why buy duplex and multi-family plans for San Francisco, CA from us
A good investment plan is more than a house split in two. Unit layout, parking, sound control and utility metering all affect your returns.
We draw side-by-side and stacked duplexes, triplexes, fourplexes and townhome rows, with mirrored units that keep construction costs down.
Investor-minded
Layouts that rent faster and cost less to maintain.
Mirror and repeat
Mirrored units cut framing and plumbing costs; unlimited-build rights let you reuse the plan.
Lender-ready
A complete plan set helps appraisers and construction lenders move faster.
What's included in your duplex and multi-family plans
- Side-by-side, stacked or front-and-back layouts
- Sound-rated party walls and floors
- Separate meters, panels, HVAC and water heaters
- Private entries, patios and parking per unit
- Fire separations for three or more units
Plan prices by size
| Up to 1,000 sq ft | $1,050 |
| 1,001 – 1,500 sq ft | $1,295 |
| 1,501 – 2,000 sq ft | $1,495 |
| 2,001 – 2,500 sq ft | $1,695 |
| 2,501 – 3,000 sq ft | $1,895 |
| 3,001 – 3,500 sq ft | $2,195 |
California engineer stamp from $1,500. See every option on our pricing page.
Where to get your San Francisco building permit
Get Planning Department zoning approval first. New homes go through In-House Review, and new residential buildings need an acoustical report.
Checked November 2026. Offices and rules change, so confirm with the office before you apply.
Building requirements
Building a house in San Francisco, CA: what the code requires
Statewide residential code
- Building code
- California Residential Code (Title 24, Part 2.5) applies statewide, with local amendments common in larger cities.
- Energy code
- California Energy Code (Title 24, Part 6) is one of the strictest in the US. New homes generally require solar PV, and all-electric readiness rules apply.
- Climate zone
- IECC climate zone 2–6. Insulation, windows and HVAC are sized to match.
- Typical frost depth
- 0–12 in (coast/valleys), 18–36 in (mountains). Footings must extend below the local frost line (confirm with your building department).
- Foundations
- Raised or pier foundations where flood zones apply; slab inland.
- Who can draw the plans
- Single-family homes can generally be designed by a non-licensed home designer. A licensed engineer's stamp is often required for structural items, engineered foundations or special hazard zones, or when the local building official asks for it.
- Engineer stamp
- If your jurisdiction requires sealed drawings, add our California Engineer Stamp / Permit-Ready package ($1,500).
California-specific rules & hazards
- CALGreen (Title 24, Part 11) green-building requirements apply to all new homes.
- Wildland-Urban Interface areas (Fire Hazard Severity Zones) require Chapter 7A ignition-resistant construction.
- Seismic design is required statewide, and plans often need engineered lateral (shear wall) calculations.
- Coastal Commission permits may apply within the coastal zone.
- Seismic bracing, shear walls and hold-downs
- Wildfire-resistant materials and defensible-space detailing
- Flood-zone elevation and coastal foundation requirements
Summary for planning only. Codes, editions and local amendments change, so always confirm current requirements with the building department that will issue your permit. Our designers check your jurisdiction before drawing.
Traditional homes we can draw for San Francisco, CA
Style inspiration photos, not homes built in San Francisco, CA or by HousePlans USA.
How ordering works
- 1
Get inspired
Pick the exterior styles and interior looks you love, or paste links to plans you've seen online.
- 2
Design & instruct
Choose rooms, size, basement, garage and your state, and tell our designers exactly what you want.
- 3
Compare 2+ concepts
Two or more designers each sketch a concept. Pick your favorite designer to draw the full plans.
- 4
Download & revise
Plans arrive by email and in your dashboard by your deadline. Revisions are free for 30 days.
Duplex House Plans in San Francisco, CA: FAQ
Can I build a duplex in San Francisco, CA?+
It depends on your lot's zoning. Many cities have widened where duplexes are allowed, and we check your zoning first.
Can each unit have its own meter?+
Yes. We design separate electrical panels, HVAC systems and water heaters for every unit.
How much do duplex plans cost in San Francisco, CA?+
Custom plans start at $1,050 for homes up to 1,000 sq ft and are priced by size. Most family homes come to $2,000–$3,000 all-in, with free customization and 30 days of revisions.
How fast can I get duplex plans for San Francisco, CA?+
Standard delivery is 10 business days. Priority, Express, Rush (48 hours) and Super Rush (24 hours, up to 3,000 sq ft) are available at checkout.
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