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General Contractor in Walnut — 32 Services, One Licensed LA Builder

Walnut is an independent San Gabriel Valley city; hillside parcels and foothill edges fall inside the Very High Fire Hazard Severity Zone with Hillside Management Area review. ZIP 91789 · City of Walnut (independent jurisdiction).

ZIP
91789
Permit authority
City of Walnut (independent jurisdiction)
Typical lot
10,000 sqft
LA County tier
2% above LA County median
Very High Fire Hazard zoneHillside ordinance

Chat about your Walnut project

Pre-seeded for Walnut. Mention your lot, your timeline, and any known constraints — Baily factors the city permit queue and WUI fire-zone into the scope.

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Every service we scope in Walnut

All 32 NP Line Design service lines, priced for the Walnut market. Each one opens a Baily chat pre-seeded with Walnut-specific overlays, lot assumptions, and permit-queue context.

Whole-home & additions

Whole-home renovation in Walnut
$153K–$816K · 16–40 wk
Gut renos, whole-house upgrades, multigenerational reconfigurations.
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Room additions in Walnut
$87K–$388K · 12–28 wk
Second stories, primary suite additions, detached office pods.
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New home construction in Walnut
$459K–$2.5M · 36–72 wk
From empty lot to keys — permit-aware, coastal-commission ready.
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Custom home design in Walnut
$510K–$3.6M · 36–80 wk
Ground-up custom residential — design, permit, build under one roof.
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Preconstruction design-build in Walnut
$5K–$51K · 2–8 wk
Budget + schedule + permit pathway validated before you commit.
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Hillside construction in Walnut
$204K–$918K · 24–50 wk
Slope, geotech, caisson foundations — hillside ordinance expertise.
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Kitchens & bathrooms

Kitchen remodeling in Walnut
$46K–$184K · 6–14 wk
AI-scoped kitchens — real LA labor + materials, Title 24 compliant.
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Bathroom remodeling in Walnut
$26K–$87K · 4–10 wk
Spa bathrooms, walk-in showers, master suites — scoped in minutes.
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Luxury interior design in Walnut
$82K–$510K · 10–30 wk
High-end finishes, custom millwork, signature materials.
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Interior design in Walnut
$15K–$184K · 4–20 wk
Cabinetry, countertops, finishes — integrated with the build.
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Interior finishing in Walnut
$8K–$77K · 2–10 wk
Drywall, trim, millwork, paint — the final 15% that matters.
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ADUs & garage conversions

ADU construction in Walnut
$184K–$459K · 20–36 wk
AI-scoped ADUs — permit-aware for AB 1033, SB 9, and LA by-right rules.
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Garage conversion in Walnut
$92K–$224K · 12–24 wk
Detached or attached garage → livable ADU, AB 1033 ready.
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Garage remodeling in Walnut
$8K–$46K · 2–6 wk
Storage systems, workshop build-outs, modernization.
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Pool house design in Walnut
$46K–$286K · 8–24 wk
Cabanas, guest structures, detached wellness pavilions.
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Disaster & resilience

Wildfire rebuild in Walnut
$306K–$1.2M · 24–60 wk
Palisades, Eaton, SB 1103 — we've rebuilt through every fire zone.
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Water damage restoration in Walnut
$5K–$87K · 1–12 wk
Flood, leak, mold remediation — insurance-approved.
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Seismic retrofit in Walnut
$12K–$66K · 2–8 wk
Soft-story, hillside ordinance, cripple-wall — LA seismic code baked in.
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Roofing in Walnut
$15K–$82K · 1–4 wk
Class A fire-rated, cool roof, re-roof, new construction.
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Exteriors, pools & landscape

Exterior design in Walnut
$18K–$122K · 3–12 wk
Siding, cladding, facades, curb-appeal reworks.
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Pool & spa construction in Walnut
$66K–$255K · 10–24 wk
Pools, spas, water features — permit + safety compliant.
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Patio covers & pergolas in Walnut
$6K–$46K · 2–6 wk
Shade structures, outdoor rooms, pergola + cover combos.
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Landscape design in Walnut
$15K–$184K · 4–16 wk
Defensible space, irrigation, drought-tolerant, full yards.
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Concrete & outdoor living in Walnut
$8K–$122K · 2–10 wk
Patios, driveways, hardscape, outdoor kitchens.
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Finishes, systems & specialty

Flooring in Walnut
$5K–$66K · 1–4 wk
Hardwood, tile, vinyl, terrazzo — installed on our job sites daily.
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Epoxy flooring in Walnut
$3K–$18K · 1–2 wk
Garage floors, industrial spaces, showroom-grade coatings.
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Painting in Walnut
$3K–$36K · 1–3 wk
Interior, exterior, specialty coatings, eco-paint.
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Window & door replacement in Walnut
$8K–$87K · 1–4 wk
Title 24 compliant, fire-zone rated, energy rebate-eligible.
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Green building in Walnut
$8K–$122K · 1–8 wk
Title 24, heat pumps, EV chargers, solar, net-zero upgrades.
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Architectural design in Walnut
$8K–$122K · 4–20 wk
Design-build integrated — CAD, elevations, permit sets in-house.
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General construction in Walnut
$10K–$2.0M · 1–80 wk
Hub for all 32 services — one licensed GC across the full project.
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Commercial construction in Walnut
$102K–$2.0M · 12–50 wk
Retail, office, TI, mixed-use — permit-aware LADBS + LACity.
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Permit authority in Walnut

Walnut runs an independent building department separate from LADBS. City of Walnut (independent jurisdiction) enforces the California baseline code plus any locally-adopted amendments — allow 6–14 weeks for plan-check on a typical addition and 12–20 weeks for new construction.

Regulatory overlays that apply here

Very High Fire Hazard Severity Zone — Walnut parcels fall inside the state VHFHSZ map, which triggers California Building Code Chapter 7A (ignition-resistant construction). Class A fire-rated roofing, 1-hour exterior walls, ember-resistant vents, tempered-glass windows, and a 5-foot non-combustible perimeter (Zone 0) are mandatory on new builds and substantial remodels.
Hillside ordinance — sloped lots in Walnut trigger LA Municipal Code §12.21 C.10 (hillside ordinance) or the equivalent local ordinance: geotechnical review, haul-route permitting for soil export, ASCE 7 seismic design category re-analysis, and setback scaling by natural slope. For many additions this is the single biggest schedule driver.
Origin

Who is Baily?

Baily is named after Francis Baily — an English stockbroker who retired at 51, became an astronomer, and in 1836 described something on the edge of a solar eclipse that nobody had properly articulated before: a string of bright beads of sunlight breaking through the valleys along the moon’s rim.

He wasn’t the first to see them. Edmond Halley saw them in 1715 and barely noticed. Baily’s contribution was clarity — describing exactly what was happening, in plain language, so vividly that the whole field of astronomy paid attention. The phenomenon is still called Baily’s beads.

That’s what we wanted our AI to do. Every inbound call and text has signal in it — a homeowner’s real question, a timeline, a budget, a hesitation that means “yes but.” Baily listens to every one, 24/7, and finds the beads of light.

Baily was a businessman before he was a scientist. That’s our vibe too.

Questions LA homeowners actually ask

Nearest neighborhoods

Adjacent LA markets we work in. Same licensed team, different overlay mix.

Diamond Bar
ZIP 91765
10,000 sqft typical · 2% above LA County median
Rowland Heights
ZIP 91748
7,500 sqft typical · 2% above LA County median
La Puente
ZIP 91744
6,500 sqft typical · 2% above LA County median
Covina
ZIP 91722
7,000 sqft typical · 2% above LA County median
Industry
ZIP 91744
0 sqft typical · 5% below LA County median

Related resources

Guides, cost tables, and decisions to make before you call.

Service menu
All 32 LA services
Full project-type directory
Guide
LADBS permit process
How plan-check actually works
Guide
Wildfire rebuild (SB 1103)
Relevant to Walnut overlays
Cost guide
Kitchen cost — all 167 LA neighborhoods
Updated 2026