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Home Addition Cost in Los Angeles — Per-Type Pricing, 2026
Home additions in LA aren't priced by square foot — they're priced by what's underneath and around them. A 300 sq ft bump-out on slab is $85K. The same 300 sq ft over a crawl space with sewer reroute is $115K. NP Line Design separates the four real types — bump-out, room addition, second story, full wing — and quotes each one fixed-price after a free site visit. CSLB #1105249, 4–10 month build, permit and engineering included.
Quick Answer
Home addition cost in Los Angeles ranges from $85,000 (300 sq ft bump-out on slab) to $480,000 (1,000+ sq ft second-story addition). Room additions (separate bedroom + bath, ~500 sq ft) are $150,000–$220,000. Second stories require structural reframing of the first floor's wall plates and ceiling and run $320,000–$480,000 for 800–1,000 sq ft. NP Line Design (CSLB #1105249) handles structural engineering, LADBS permits, and 4–10 month builds.
What You Get — Tiered Pricing, Fixed Contracts
- ✓ Bump-Out — $85K–$120K, 4–5 months: 200–400 sq ft, extends existing room, slab + framing
- ✓ Room Addition — $150K–$220K, 6–7 months: 400–600 sq ft, new bedroom + bath, full systems
- ✓ Master Suite Addition — $220K–$300K, 7–8 months: 500–700 sq ft, primary bedroom + walk-in + bath
- ✓ Second Story — $320K–$480K, 8–10 months: 800–1,200 sq ft, full new floor over existing
- ✓ Full Wing — $400K–$600K, 9–12 months: 800–1,500 sq ft, new wing with multiple rooms
Home Addition Pricing — Los Angeles, 2026
| Tier | Scope | Price Range | Timeline | What's Included |
|---|---|---|---|---|
| Bump-Out | 200–400 sq ft extension of existing room | $85,000 – $120,000 | 4 – 5 months | Slab, framing, MEP extension, drywall, finishes |
| Room Addition | 400–600 sq ft, new bedroom + bathroom | $150,000 – $220,000 | 6 – 7 months | Above + new bath plumbing, separate HVAC zone |
| Master Suite | 500–700 sq ft, primary bedroom + walk-in closet + bath | $220,000 – $300,000 | 7 – 8 months | Above + walk-in closet, en-suite bath, upgraded finishes |
| Second Story | 800–1,200 sq ft over existing 1st floor | $320,000 – $480,000 | 8 – 10 months | Structural reframe, stair, full 2nd floor systems |
| Full Wing | 800–1,500 sq ft new attached wing, multiple rooms | $400,000 – $600,000 | 9 – 12 months | All above + multiple rooms, expanded MEP, landscape |
Prices are fixed at contract signing. NPLD absorbs costs from hidden conditions (rotted subfloor, hidden plumbing, etc.) — your price doesn't change after demo starts.
How It Works — 5 Steps
- Step 1 — Free site visit + feasibilityNetanel walks your home with you, measures the addition site, photographs existing structure + utilities, checks lot setbacks via parcel map, and recommends the type of addition (bump-out vs room vs wing) that fits your zoning and budget.
- Step 2 — Structural engineering + designWe engage a licensed structural engineer (~$2,500–$5,000 depending on scope) to calculate loads, footing requirements, and any retrofit of the existing structure (especially for second stories). Floor plans + elevations follow.
- Step 3 — LADBS permit submissionPlans submitted to LADBS for plan check. Typical approval: 12–20 weeks depending on complexity. Second stories take longer because of structural review. We respond to plan-checker corrections within 48 hours.
- Step 4 — Build phaseSite prep, foundation, framing, MEP rough-in, drywall, HVAC, finishes, fixtures. Weekly site walks, daily clean-up, single point of contact (Netanel). For second stories we tarp the existing roof and stage work to keep you in the home.
- Step 5 — Final inspections + warrantyLADBS final inspection, Certificate of Occupancy if required, and we hand you a 12-month workmanship warranty packet plus manufacturer warranties on roof, windows, and major systems.
Our Promise — Risk Reversal
- ✓ Fixed-Price Contract: Your price is locked at signing. We absorb hidden conditions (rotted framing, surprise plumbing, etc.) so you never get hit with a change order.
- ✓ 12-Month Workmanship Warranty: Every install. If anything fails due to our work, we fix it free for 12 months. Manufacturer warranties on fixtures and appliances apply on top of this.
- ✓ Licensed, Bonded, Insured: CSLB License #1105249, fully bonded, and carrying $2M general liability + $1M workers' comp. Your home and your finances are protected.
- ✓ Free In-Home Estimate: No fee for the consultation, no obligation to hire. We measure, listen, and quote — you decide if NPLD is the right fit.
- ✓ Single Point of Contact: Netanel Presman (owner, GC) is your direct line throughout the project. No call centers, no project-coordinator gatekeeping.
Frequently Asked Questions
How much does a home addition cost in LA?
What's the cheapest type of home addition?
How long does a home addition take?
Do I need to move out during a home addition?
How much does a second-story addition cost in LA?
Do you handle the structural engineering for additions?
What's the ROI on a home addition in LA?
Related Services + Resources
Ready to Get Started?
Tell us about your home addition cost project. We'll schedule a free in-home consultation within 5 business days across LA County, give you a fixed-price proposal within 48 hours of the visit, and you decide if NP Line Design is the right fit. CSLB License #1105249.
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Custom Home Portfolio
“Custom home cost in LA 2026 runs $500-$750 per sq ft for mid-range, $850-$1,500 per sq ft for luxury. A 3,000 sq ft mid-range custom in Encino lands at $1.5M-$2.2M before site work. Hillside adds 30-60% on top. Spec-grade builders pretend they can deliver $300/sq ft custom homes; the math doesn't pencil with current LA labor rates, supply costs, or Title 24 compliance.”
Home additions in LA cost $400-$650 per sq ft for typical mid-range scope, $750-$1,200 per sq ft for luxury. The 4 cost drivers most owners miss: foundation type (slab vs raised vs caisson — $30K-$120K swing), Title 24 envelope compliance (mandatory on any new conditioned space — adds $8K-$22K), structural review of existing-to-new connection ($3K-$8K), and school-district + transportation impact fees on any added bedroom ($3K-$15K). Real all-in: $200K-$650K for 400-1,000 sq ft addition. The marketing-page price of "$250/sq ft" is shell-only — not real LA market.