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Granny Flat Designs and Prices in Los Angeles — 3 Build Types, $180K–$320K
"Granny flat" is LA's word for what the state calls an ADU and the city calls accessory dwelling. The price gap between the three build types is huge: garage conversion at $180K, attached ADU at $230K, detached new-build at $320K. Same square footage, very different cost. NP Line Design has built 18+ ADUs across LA County and walks you through which build type your lot actually allows — before you fall in love with a design that won't pass plan check.
Quick Answer
Granny flat prices in Los Angeles range from $180,000 (garage conversion, 400 sq ft, 5-month build) to $320,000 (detached new-build, 750 sq ft, 8-month build). Attached ADUs (sharing a wall with the main house) fall in between at $230,000–$280,000. Designs are dictated by lot size, setback rules, and your existing structures. NP Line Design (CSLB #1105249) handles feasibility, design, LADBS permits, and turnkey construction.
What You Get — Tiered Pricing, Fixed Contracts
- ✓ Garage Conversion ADU — $180K–$220K, 5–6 months: 400–500 sq ft, uses existing slab + walls
- ✓ Attached ADU — $230K–$280K, 6–7 months: 500–700 sq ft, shares one wall with main house
- ✓ Detached New-Build ADU — $290K–$320K, 7–8 months: 600–750 sq ft, standalone with own foundation
- ✓ Pre-feasibility check — we tell you what your lot ALLOWS before you fall in love with a design
- ✓ CalHFA $40K grant assistance — we have helped 6 clients secure the grant; no fee for the application
Granny Flat (ADU) Pricing — Los Angeles, 2026
| Tier | Scope | Price Range | Timeline | What's Included |
|---|---|---|---|---|
| Garage Conversion | 400–500 sq ft, uses existing garage shell + slab | $180,000 – $220,000 | 5 – 6 months | Permit, full kitchen+bath, electrical upgrade, finishes |
| Attached ADU | 500–700 sq ft, shares 1 wall with main house | $230,000 – $280,000 | 6 – 7 months | Permit, foundation, framing, MEP, all finishes |
| Detached New-Build | 600–750 sq ft, standalone structure | $290,000 – $320,000 | 7 – 8 months | Permit, foundation, framing, MEP, finishes, site work |
| Two-Story Detached | 750–1,200 sq ft over two floors | $350,000 – $480,000 | 8 – 10 months | All above + 2nd floor framing, stair, additional permit |
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 feasibility checkWe pull your parcel map, check zoning, setbacks, and lot size — and tell you which build type (garage conversion, attached, detached, two-story) your lot actually allows. ~3 business days, no cost, no commitment.
- Step 2 — Design + plansOnce you choose a build type, our designer creates floor plans, elevations, and a 3D render. 2–3 design revisions included. CalHFA $40K grant application happens here if eligible.
- Step 3 — LADBS permit submissionWe submit plans to LADBS for plan check. Typical approval: 8–14 weeks for new-build, 6–10 weeks for garage conversion. We respond to plan-checker corrections within 48 hours.
- Step 4 — Build phaseFoundation (new builds), framing, MEP rough-in, inspections, drywall, finishes, fixtures, final inspections. Single point of contact, weekly site walks.
- Step 5 — Certificate of Occupancy + rental-readyFinal LADBS inspection, Certificate of Occupancy issued, and we hand you a fully rentable unit including utility separation and address recording.
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
What's the cheapest type of granny flat in LA?
Can I build a granny flat in my backyard?
How much rent can a granny flat generate in LA?
Do I need an architect to design a granny flat?
What's the CalHFA $40K grant and do I qualify?
Can I rent the granny flat short-term (Airbnb)?
How long does the granny flat process take?
Related Services + Resources
Ready to Get Started?
Tell us about your granny flat designs and prices 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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ADU Construction Portfolio
“ADUs in LA run $180K-$320K all-in for a 600-800 sq ft detached unit. A garage conversion to JADU is $100K-$200K. The variance comes from foundation type, utility separation, kitchen tier, and whether you use LA's pre-approved standard plans (which save 60-90 days on permits but constrain design). The number you read on Reddit — '$100K for an ADU' — usually leaves out site work, utility upgrades, and permits.”
ADU "prices" advertised on Google Ads in LA range $80K-$150K. Reality: that's the building-shell-only cost. Full all-in (foundation, utilities, kitchen, bathroom, finishes, permits) for a 600-800 sq ft detached ADU runs $180K-$320K. Garage conversion JADU runs $100K-$200K. The $80K number assumes the owner is providing utility connections, foundation, and finish work — i.e., they're acting as their own GC. Most owners can't. Demand all-in pricing in your contract. We don't quote shell-only.