Townhome
construction.
Townhomes are attached residential units arranged in a row, each on its own fee-simple lot (small-lot subdivision in LA, similar instruments elsewhere) or condo-mapped on one parcel. The structural work is conventional Type V wood frame; the design work concentrates on party walls — fire rating, acoustic separation, water management, and structural load path through aligned shear walls. The legal structure (small-lot vs condo) is set before any drawings start.
CA Lic. #1145233
“Townhome design is mostly party-wall design. Get those assemblies right and the rest of the row builds itself.”
What we mean by townhome construction.
TH-01 · Small-lot subdivision row (LA)
- Size
- 1,400 – 2,000 sqft per unit
- All-in
- $450 – $720 / sqft
- Schedule
- 16 – 24 months build
City of LA Small Lot Subdivision Ordinance — each unit on its own fee-simple lot. No HOA required. Most flexible resale structure.
TH-02 · Condo-mapped townhome row
- Size
- 1,400 – 2,000 sqft per unit
- All-in
- $420 – $700 / sqft
- Schedule
- 16 – 24 months build
Townhomes on one parcel mapped as condominium. HOA + CC&Rs required. DRE filing for 5+ unit projects.
TH-03 · Live-work townhome
- Size
- 1,600 – 2,400 sqft per unit
- All-in
- $500 – $800 / sqft
- Schedule
- 18 – 26 months build
Ground-floor flex space with residential above. Allows commercial use in zones that permit it; accessibility provisions apply to ground floor.
TH-04 · Density-bonus townhome row
- Size
- Per program
- All-in
- $420 – $700 / sqft
- Schedule
- 20 – 30 months build
Density Bonus Law allows extra units and waivers in exchange for affordable set-asides. Often used to fit one more townhome than base zoning allows.
Real California cost ranges.
All-in 2026 townhome costs in California run $420–$720/sqft on flat lots, with Bay Area at the top of the band. Per-unit utility splits, party-wall assemblies, fire-rated separation, and (often) residential sprinklers add $40k–$80k per unit above single-family construction. Soft costs are 14–20% of hard-cost subtotal.
Party walls
1-hour or 2-hour fire-rated party walls per CBC §420 with STC 55+ acoustic separation. $12k–$25k per shared wall.
Per-unit utilities
Sewer, water, gas, electric service per unit. $25k–$80k per unit depending on jurisdiction and service distance.
Fire sprinklers
NFPA 13D residential sprinklers in each townhome. $15k–$35k per unit. Sometimes 13R required depending on geometry.
Foundation + framing
Continuous slab across the row with separation joints, or individual slabs per unit. $25–$50/sqft. Type V wood frame $60–$110/sqft.
Title 24 + CALGreen
Per-unit heat pumps + PV + battery readiness per CEC 2022 + EVCS readiness per CALGreen. $40–$80/sqft per unit.
Civil + on-site
Driveway, shared utilities trench, on-site fire access, landscape. $40k–$200k spread across the row.
The permit path.
Townhome projects are permitted under CBC (R-3 for fee-simple townhomes; R-2 for condo-mapped) by the local building department. Small-lot subdivision requires a parcel or final map filed with the county recorder. Condo map requires CC&Rs and (for 5+ units) DRE filing. Plan check on small-lot subdivision projects typically runs 16–28 weeks in LA.
- Building permit (architectural + structural)
- Tentative + final map (small-lot subdivision or condo map)
- MEP permits per unit
- Fire sprinkler permit (NFPA 13D / 13R)
- Title 24 energy compliance per unit
- CALGreen worksheet
- Per-unit utility service permits
- DRE filing for 5+ unit condo conversions
- Density bonus determination (when applicable)
How California code shapes the work.
California townhomes are designed against CBC, CRC (single-family attached or two-family classification depending on legal structure), Title 24, CALGreen, Subdivision Map Act, and locally-adopted amendments. Party-wall fire-rating and acoustic separation are enforced at plan check.
What the schedule actually looks like.
- Step 013 – 6 weeks
Feasibility memo
Zoning, map type (small-lot vs condo), parking, utility, pro forma.
- Step 0210 – 16 weeks
Schematic + DD
Plan layout, party wall strategy, structural load path.
- Step 038 – 14 weeks
Construction documents
Permit-set drawings, party-wall details, civil.
- Step 0416 – 32 weeks
Map + plan check
Parcel / final map + building permit, sometimes in parallel.
- Step 056 – 12 weeks
Sitework + utilities
Grading, per-unit utility splits, foundation prep.
- Step 0612 – 18 weeks
Framing → dry-in
Continuous row framing with party walls + roof.
- Step 0716 – 26 weeks
MEP + finishes
Per-unit MEP + finishes, sprinklers, common areas.
- Step 084 – 10 weeks
Final inspections + CofO
Per-unit + building-wide final inspections, fire marshal.
How we run this work.
Every townhome project starts with the legal structure decision: small-lot subdivision (fee-simple, no HOA) versus condo map (HOA, CC&Rs, DRE for 5+ units). The decision drives resale economics, financing options, and the map filing path. We model both before drawings start.
Party-wall design — fire rating, STC, structural alignment, water management at the eave / parapet — locks at design development. We walk owners through the assembly before CDs to keep the trade-off visible.
Construction runs on a design-build contract with the row priced as one structure but utilities and final inspections split per unit. CofO is per unit; first unit can sometimes close while later units are still in punch-list.
Frequently asked.
- What is small-lot subdivision?
- City of LA Small Lot Subdivision Ordinance (LAMC 12.22-C.27) allows attached townhomes on individual fee-simple lots smaller than the underlying zoning's minimum lot size, provided each unit meets objective design standards. Each townhome is sold separately without an HOA. Many other California jurisdictions have similar mechanisms.
- What is the difference between small-lot and condo townhomes?
- Small-lot: each unit on its own fee-simple lot, no HOA, no DRE filing, easier conventional residential financing. Condo: all units on one parcel under common ownership, HOA + CC&Rs required, DRE filing for 5+ units, sometimes harder to finance individually. Small-lot tends to sell faster in California.
- How are utilities run to each townhome?
- Each unit gets independent metered service for electricity, gas, water. Sewer can be a shared lateral with each unit having its own cleanout, or separate laterals per unit (depends on jurisdiction). The utility trench is dug once for the whole row.
- Do townhomes need fire sprinklers?
- Yes, almost always. NFPA 13D residential sprinklers in each townhome are standard. Some geometries (large unit count, multi-story with limited egress) trigger 13R instead. We confirm at pre-application.
- What is the acoustic separation requirement?
- California Building Code requires party walls and floor-ceiling assemblies between dwelling units to meet minimum STC and IIC ratings. We design party walls to STC 55+ and floor-ceilings to IIC 55+ — above code, because owners notice the difference.
- Can I phase the townhome row?
- Yes — large rows can be phased. Site work and shared utilities are typically permitted as one package; building permits can be issued per pair / quad. We sequence so the first units close before later units complete.
- What about parking?
- Townhomes typically include attached garages per unit (most common in California). Driveway access is shared or per-unit depending on lot geometry. Parking requirements vary by jurisdiction and AB 2097 eliminates minimum parking within ½ mile of major transit.
Start with a feasibility memo.
Tell us about the parcel and the program. We'll come back with a written feasibility memo before any design work starts.
Want a real number for your Townhome Construction job?
- We open the books on similar jobs from the last 24 months
- Hand-built estimate, not a software auto-quote
- Includes permits, finishes, and the boring stuff
3-day turnaround · Free