San Fernando Valley · Cost
What an ADU costs in San Fernando Valley
Honest 2026 pricing for San Fernando Valley ADU projects. These ranges are installed cost — design, permit, construction, and standard finishes — based on jobs we've actually closed in this market.
Installed cost ranges
- Detached new-build
- $220–$290/sqft
- Garage / interior conversion
- $170–$230/sqft
Why San Fernando Valley prices look like this
- Most predictable cost in our service area — flat lots, easy crane / concrete access.
- Chapter 7A fire-rated assemblies add $18–35k in materials on VHFHSZ parcels.
- Mulholland Specific Plan parcels add design + filing fees, not construction cost.
- LADWP service drop runs $4–12k depending on existing main panel.
How to read these numbers
These are total installed $/sqft, not just construction. The detached range assumes a clean 600–900 sqft new-build with mid-range finishes. Conversions price lower because the shell already exists — most cost lives in plumbing, electrical, and the kitchen. Move outside these ranges and we'll tell you why before you sign anything.
Foreman's notebook · San Fernando Valley
What we know walking onto a San Fernando Valley lot
- From Mid-City yard
- 28 min
- Jobs finished here
- 44
- Build window
- Year-round; July–Sept heat slows roofing crews after 11am.
Today's daylight window
Sunrise
5:53 AM
Golden hour
7:31 PM
Sunset
8:08 PM
Day length
14h 15m
Permit counter
LADBS — Van Nuys Office
6262 Van Nuys Blvd, Van Nuys, CA 91401
Phone
(818) 374-5000
Hours
Mon–Fri 7:30am–4:30pm
Our typical wait: 6–9 weeks ministerial (online)
Site
Flat R1, mostly. South-facing rears in NoHo are wind-protected — great for outdoor kitchens.
Crane / staging
Full-size crane fits most blocks. Boom-pump concrete with no street closure.
Crew spot
The Six Chow House — Van Nuys
City dossier · the 20 things we track
- Locals call it
- The Valley / SFV
- Architectural DNA
- Ranch · post-and-beam · contemporary box
- Our signature spec
- Smooth stucco · standing-seam metal roof · double-stud wall
- Fire hazard zone
- Moderate (Sylmar/Sun Valley: VHFHSZ)
- Nearest fault
- Verdugo Fault · 2 mi
- Title 24 climate zone
- Title 24 Zone 9 (inland)
- Median lot
- 6,800 sf
- Typical setbacks
- 5ft side · 15ft rear (R1)
- New 1BR ADU rents
- $2,400–$2,900 /mo
- Resale lift w/ ADU
- +10–14%
- Iconic landmark
- Sherman Oaks Galleria · 1.1 mi
- Street sweeping
- Mon or Wed (per route)
- Trash / dumpster day
- Wednesday (LASAN)
- Solar yield
- 1,770 kWh / kW · yr
- Avg summer high
- 96°F
- Avg winter low
- 45°F
- Lots inside an HOA
- 6%
- Nearest ER
- Sherman Oaks Hospital
- Jobsite radio
- KROQ 106.7 + classic rock
- Protected trees
- Valley oak · California sycamore · jacaranda
- Crew lunch spot
- Tacos Tu Madre — Van Nuys Blvd
10 things we already know about this area
- Most predictable plan check in LA city. Online submittal hits 6 weeks routinely.
- Mulholland Specific Plan affects south-side hillside parcels — view corridors get scrutinized.
- Sylmar + parts of Sun Valley sit in VHFHSZ — Chapter 7A assemblies and 100ft defensible space.
- Flat lots = boom-pump concrete in one pour. Saves 2 days vs Eastside.
- Encino has private utility easements many title reports miss — request the supplemental.
- Reseda alleys are 20ft and clean — full-size crane works.
- LADWP Power Hub at Van Nuys is the fastest service drop in the city.
- Tarzana hillside soil swells — capillary break under the slab is non-negotiable.
- Most R1 lots accept 1,200sf detached + JADU without a CUP.
- Many Valley garages are pre-1965 with substandard footings — budget $8–14k for footing replacement on conversions.
Material yards we call here
- Anawalt Lumber — Sherman Oaks · lumber
- Robertson's Ready Mix · concrete
- Reseda Hardware Pro Desk · lumber
Recent jobs
- Hatteras St · Detached 2BR ADU + JADU
1,200sf · 19 weeks · 1 mo ago - Burbank Blvd · Garage conversion + workshop
600sf · 12 weeks · 4 mo ago - Lemay St · 1BR detached, flat lot
780sf · 16 weeks · 8 mo ago
"The Valley is where a clean ministerial ADU actually feels clean. We file online and the schedule holds."
28 things we track for every San Fernando Valley job
What changes when the lot is in San Fernando Valley
Same plans drawn three miles apart can cost $80k different. These are the local conditions, ordinances, soils, utilities, and crew realities that decide the number. We update this from our own jobs and the city counter.
Regulation & permits
- Noise / construction hours
- Mon–Sat 7a–8p · no Sun (LAMC) · stricter in Hidden Hills (8a)
- Historic overlay
- Van Nuys (limited) · most Valley = no HPOZ · Toluca Lake HOA review common
- Parking / dumpster permit
- LADOT permit · wide streets = easy crane staging · dumpster $122/wk
- Demo diversion mandate
- 65% diversion (LAMC) · Looney Bins / All Pro Recycling in Sun Valley
- School impact fees
- LAUSD: $4.79/sf · LV Charter / private schools no fee
- Prop 13 reassessment
- ADU under 750sf = no reassessment · over = blended (Valley flips common)
- Zoning trajectory
- RA → RE5 splits via SB9 · Encino mansion-ization debate ongoing
- ADU pre-approved plans
- LA Standard Plan + ADU Universe pre-approved (4 wk turnaround)
Site & geology
- Soil type
- Alluvial silt over sandy clay — moderate expansion · liquefaction zones along LA River
- Water table
- 15–40 ft in floodplain (Sepulveda Basin) · 60–100 ft on terraces
- Foundation pier depth
- 6–10 ft typical · 14 ft in liquefaction zone (Sun Valley)
- Subsurface conflicts
- Oil wells in Sun Valley + Pacoima · old septic in Chatsworth horse properties
- Wildlife / habitat mitigation
- Burrowing owl in vacant lots · gnatcatcher in chaparral edges
- Seasonal risks
- 100°F+ Jul–Sep (concrete pour windows) · Santa Ana fire risk in Sylmar / Chatsworth
- Street / delivery access
- Wide 36–44 ft streets · easy semi-truck access · concrete pump always works
- Airport / flight-path noise
- Bob Hope BUR + Van Nuys VNY both active · noise contours over Encino, Sherman Oaks
Utilities & energy
- Utility upgrade wait
- LADWP 200A: 12–18 wk · transformer upsize +$11k common on ADU adds
- Seismic retrofit history
- ~28% of pre-1978 multifamily retrofitted · Northridge '94 = many already done
- NEM 3.0 / solar export
- SCE export $0.05–0.08/kWh · battery essential · payback 8–11 yr typical
- Pool permit reality
- Common request · 8–10 wk gunite schedule · drought = solar heat preferred
Culture & crew
- Local salvage / reclaimed
- Liquidators (Sun Valley), Habitat Restore (Bell Gardens), Diamond Foam & Fabric
- Color / palette rules
- No HPOZ · HOA palettes in Sherman Oaks gated, Encino estates · stucco color limits
- Theft risk on jobsite
- Tool theft Pacoima / Sun Valley · copper from AC condensers · Ring + sitebox standard
- Sub-contractor ecosystem
- Strong: everything (largest sub pool in metro) · best price/scale ratio in basin
- Tree protection fines
- Protected tree (oak/sycamore/walnut/bay): $15k + 4:1 · valley oak especially policed
- Jobsite language
- Spanish dominant · Armenian common (Glendale-adjacent jobs) · English with super
Money & momentum
- Top cost surprises
- Transformer upsize ($11k) · sewer LA City connection fee ($6–14k) · HOA review delay
- Permit boom indicator
- ADU permits +51% YoY · whole-house +18% (Encino, Studio City) · pool +8%
Sources: city counter notes, our own permit logs, CalRecycle, CA Title 24, DOGGR, CAL FIRE FHSZ, USGS Q-Fault, PG&E / SCE / LADWP rate sheets, school district fee schedules. Last reviewed by our PMs this quarter.
Cost in La Valley: we'll cost yours from comparable jobs on your zip.
- Pulled from real La Valley permits in the last 18 months
- No 'national average' nonsense
- We hand you the comparable addresses
Free · 48-hour turnaround