ADU Design Resource · Manhattan Beach, CA
The Complete Guide to
Building an ADU in Manhattan Beach, CA
Everything Manhattan Beach homeowners need to plan, permit, and profit from an ADU — including current 2026 zoning rules, real construction costs, neighborhood ROI data, and verified local lenders.
Created by Build With A Plan · Permit-ready drawings (more below)
Quick Answers About Manhattan Beach, CA ADUs
Market Context
Manhattan Beach has a median home value of $2,400,000. Adding an ADU typically increases that by 25% — approximately $600,000 in added equity. A 1-bedroom ADU in Manhattan Beach rents for approximately $2,278/month in the Los Angeles County rental market , yielding a 5% cap rate on the investment. Occupancy averages 96% in this market.
Top Manhattan Beach neighborhoods for ADU investment include Mira Costa Area (East Manhattan Beach), Liberty Village, Tree Section, Poets Section, Manhattan Heights. Large 7,500+ sq ft lots, almost entirely single-family homes, and walking distance to Mira Costa High School drive strong year-round rental demand for both staff and student families. 5,000–7,000 sq ft lots on single-family blocks near Meadows Elementary and Manhattan Beach Middle School create affordable ADU build sites with steady family-renter demand.
Permit Process
Permit applications are reviewed by the Building and Safety , with a plan check timeline of approximately 12 weeks. Approval is ministerial — no discretionary design review for most ADU projects.
Manhattan Beach properties within the Coastal Overlay Zone require a Coastal Development Permit (CDP) in addition to standard building permits. CDPs add 2–6 months to the permit timeline and require compliance with both local ordinances and California Coastal Commission standards.
Because most Manhattan Beach lots sit within the Coastal Zone, your ADU plans need a Coastal Development Permit on top of the standard Building and Safety review — and if your project isn't exempt (say it's visible from a public viewing corridor or near the Strand), that can tack on another 2-4 months and a separate staff-level review before you even get to plan check. Add in the city's D0 seismic zone requirements, which often mean stamped calculations for soil bearing and shear walls that a generic ADU plan set won't already include, and many homeowners get bounced back for corrections on their first submittal. Also don't assume you can offset costs with a short-term rental — Manhattan Beach explicitly bans STRs in ADUs, so the numbers only work as long-term housing or family use.
"In my experience, that 12-week permit timeline is a state-level estimate and doesn't account for Manhattan Beach's Coastal Development Permit process, which routinely adds several months once you're in the Coastal Zone — I've seen straightforward ADUs stretch past 6 months once CDP review and any Coastal Commission appeal window come into play. I'd also treat the $/sqft cost figure as a starting point only; get quotes from contractors who've actually pulled ADU permits here recently, since coastal construction and soil conditions can push real numbers well above generic averages."
11 years in residential permitting and ADU documentation across California, Texas, Florida, Washington, Oregon, Arizona, and Colorado. This guide was researched and verified against Manhattan Beach's building department records and current 2026 California ADU law.
Property Eligibility
Is My Manhattan Beach, CA Property Eligible for an ADU?
Manhattan Beach homeowners are governed by California state ADU law (AB 2221 and SB 897). Here's what applies to your property before you start designing.
Single-Family Home
Permitted on single-family lots in Manhattan Beach under California state ADU law (AB 2221 and SB 897). No owner-occupancy requirement in Manhattan Beach — you can rent both units as investment properties. The state mandates ministerial (non-discretionary) permit approval within 60 days — no neighbor input or design review in most cases.
Multi-Family Property
Up to 2 detached ADUs plus JADUs (Junior ADUs) within the existing main structure are permitted under California state law. Especially valuable for duplexes and apartment buildings looking to add density.
HOA-Governed Properties
Approximately 22% of Manhattan Beach homes are in an HOA. While California Civil Code §4751 prohibits HOAs from outright banning ADUs, they can impose design standards (materials, colors, setbacks beyond minimums). Our drawings include HOA submission formatting.
Coastal Zone Properties
Properties within Manhattan Beach's Coastal Overlay Zone require a Coastal Development Permit (CDP) in addition to standard building permits. This adds 2–6 months to the timeline. Our drawings flag coastal requirements and meet both local and California Coastal Commission standards.
Always verify eligibility with Building and Safety before designing.
Free — No Obligation
Will Manhattan Beach Approve an ADU on Your Lot?
Send us the address and we’ll check it against Manhattan Beach’s current zoning, setbacks, and lot-coverage rules — then tell you honestly whether to proceed. Free, and no payment is taken unless your property qualifies.
- ✓Lot qualification against current Manhattan Beach code
- ✓Your buildable envelope — setbacks and maximum footprint
- ✓Realistic rental income and payback estimate
- ✓Financing pathways you’d likely qualify for
- ✓A straight GO / NO-GO answer within 48 hours
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Your feasibility report is being prepared. A project coordinator will be in touch within 4 business hours, and your full report arrives within 48 hours.
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Manhattan Beach ADU Return Calculator — Built With 2026 Local Data
Pre-loaded with verified Manhattan Beach construction costs, median rental rates, and property value uplift data. Adjust the inputs to model your specific project.
Your Project
Projected Returns
* Estimates only. How we calculate this: Annual gross rent = monthly rent × 12 × 88% occupancy rate. Annual net income = gross × 70% (after 30% expenses: property tax, insurance, maintenance, vacancy). Value added = median home value × 25% uplift (California ADU comparables). Total return = net income × years + value added. Break-even = total build cost ÷ annual net income. Consult a licensed financial advisor before investing.
Data sources: Building and Safety (source ↗), Zillow Rental Market Reports, and public state/local housing data. Last verified: 2026-08-15.
Local Market Data
Top Manhattan Beach Neighborhoods for ADU Investment
Mira Costa Area (East Manhattan Beach)
Large 7,500+ sq ft lots, almost entirely single-family homes, and walking distance to Mira Costa High School drive strong year-round rental demand for both staff and student families.
Liberty Village
5,000–7,000 sq ft lots on single-family blocks near Meadows Elementary and Manhattan Beach Middle School create affordable ADU build sites with steady family-renter demand.
Tree Section
West of Sepulveda with 4,400–5,400 sq ft lots and a near-100% single-family housing stock near downtown jobs makes detached ADUs highly feasible and profitable.
Poets Section
Oversized private lots inside the Mira Costa neighborhood allow generous detached ADU floor area while remaining in a top-rated school zone that fuels rental demand.
Manhattan Heights
Single-family blocks east of Sepulveda with 5,000–7,000 sq ft lots and proximity to the middle school and Polliwog Park offer strong rental demand and lower entry cost for builders.
Hill Section
Manhattan Beach's largest residential lots (often 12,000+ sq ft) and panoramic-view estates support premium detached ADUs for high-end executive renters, despite higher build costs.
American Martyrs Area
Tree Section pocket of single-family homes with well-maintained yards centered around American Martyrs School generates consistent family-renter demand for new ADUs.
Pacific Elementary Area
Single-family homes clustered around Pacific Elementary School see strong parental-renter demand, making ADUs near this top school highly marketable.
Walkstreets (Sand Section)
Pedestrian-only walkstreets in the Sand Section have smaller lots but extremely high short-term and beach-adjacent rental demand that supports premium ADU rents.
Manhattan Village (Estate Homes)
Gated estate-home enclaves with among the largest lots in the Village provide room for detached ADUs that can serve the nearby mall, hospital, and professional-service job centers.
Manhattan Beach ADU Market at a Glance
Local Zoning Rules
2026 Manhattan Beach ADU Rules
Manhattan Beach's 2026 ADU ordinance caps new units at 1,200 sq ft and 16 ft of height — in the typical range most ADU floor plans are designed around. Setbacks run 4 ft side and 4 ft rear, close to the regional baseline. Because of Manhattan Beach's Seismic Design Category D0 classification, structural drawings for a detached ADU here need a licensed engineer's stamp — architectural sheets for a code-compliant unit under the size cap generally don't.
Permit fees vary by project valuation — in line with what most homeowners budget for permitting, and plan check takes about 12 weeks at Building and Safety. Submit directly to the department online — link below.
| Regulation | Manhattan Beach Allowance |
|---|---|
| Max ADU Size | 1,200 sq ft |
| Max Height | 16 ft |
| Side Setback | 4 ft |
| Rear Setback | 4 ft |
| Architect / Engineer Stamp | Required for structural — Manhattan Beach's Seismic Design Category D0 classification |
| Owner Occupancy | Not required |
| Short-Term Rental | Restricted |
| Coastal Overlay | Yes — CDP may be required |
| Design Review | No |
| HOA Prevalence | 22% of properties |
| Permit Fees | Varies by project valuation |
*Load-bearing modifications to the existing house always need an engineer stamp regardless of ADU size. Data verified 2026-08-15T06:10:50.038Z. Always confirm with the Building and Safety before designing.
Manhattan Beach Permit Process
Manhattan Beach ADU Permit Timeline & Fees
Local Financing Resources
Local ADU Lenders in Manhattan Beach
These lenders offer HELOC, construction, and renovation loans for ADU projects in Los Angeles County. Compare terms before committing.
Operates two Manhattan Beach branches (1120 N. Sepulveda Blvd. and 1440 Rosecrans Ave); offers HELOCs and home equity loans up to $500,000 at fixed or variable rates — local credit union with ADU-applicable equity financing.
Visit Lender ↗Headquartered in Redondo Beach (next-door South Bay neighbor to Manhattan Beach); HELOC indexed to WSJ Prime 8.50% + 0.50% margin, 4.00% floor / 12.00% cap, fixed-rate option to 15 years — well-suited for ADU funding.
Visit Lender ↗California-based bank offering a One-Time Close construction-to-permanent loan with low fixed construction-period rate, 20% down to avoid PMI — available statewide including Manhattan Beach.
Visit Lender ↗Publishes a dedicated 'ADU HELOC' product for California properties; credit lines $10,000–$500,000 (currently 7.250% APR), explicitly designed to fund ADU construction or home renovation.
Visit Lender ↗California-licensed specialty ADU/renovation lender (Renovation Technologies Holdings Inc., NMLS #2412747); factors in the home's after-renovation value so borrowers can finance ADU projects without refinancing their first mortgage.
Visit Lender ↗Build With A Plan is not affiliated with these lenders. Always compare rates and consult a mortgage professional.
Local Build Partners
Vetted ADU Contractors in Manhattan Beach
We draw the plans. These contractors build them. Independent — no referral fees paid or received.
Build With A Plan provides drawings only. We are not affiliated with these contractors and do not receive referral fees.
Next Steps
Ready to Move Forward With Your Manhattan Beach ADU?
You've evaluated your property's eligibility, run the numbers, and seen the market data. The next step is getting permit-ready architectural drawings to submit to Building and Safety.
Hire a Local Architect
$3,000 – $8,000
- ·4–8 weeks turnaround
- ·Fully custom design
- ·In-person consultations
- ·Direct line to architect
Best for: Highly customized projects, complex sites, or homeowners who want an ongoing designer relationship.
Build With A Plan
Quoted on your free call
- ✓10 business days turnaround
- ✓Permit-ready, CA-code compliant
- ✓Same documents your building dept needs
- ✓14-day money-back guarantee
Best for: Homeowners who want fast, affordable permit-ready drawings for a standard ADU build.
Both options produce permit-ready architectural drawings accepted by Building and Safety. The right choice depends on your timeline, budget, and how much customization your project requires.
Drawing Package Details
What's Included in Your Manhattan Beach ADU Package
Engineered for CA Permit Approvals
What You Get
Manhattan Beach ADU Drawings — What's Included
How our permit-ready drawing sets compare to hiring a local architect in Manhattan Beach:
| Service Type | Typical Cost | Turnaround | Customization |
|---|---|---|---|
| Local Architect | $3,000 – $8,000 | 4–8 weeks | Fully custom |
| Build With A Plan · Starter | Quoted on your free call | 10 days | Standard |
| Build With A Plan · Standard | Quoted on your free call | 10 days | Standard |
| Build With A Plan · Premium | Quoted on your free call | 5 days | Enhanced |
- ✓Site plan
- ✓Floor plans
- ✓All 4 elevations
- ✓Electrical plan
- ✓Title 24 form
- ✓PDF + DWG delivery
- ✓10 business day turnaround
- ✓Everything in Starter
- ✓Structural plans (stamped)
- ✓Cross-section details
- ✓Window & door schedules
- ✓Material specifications
- ✓1 round of revisions
- ✓Everything in Standard
- ✓3D rendering
- ✓Garage conversion alt plan
- ✓HOA submission package
- ✓Coastal Zone supplement
- ✓2 rounds of revisions
- ✓Priority 5-day turnaround
The Done-For-You Path
Want Your Manhattan Beach ADU Fully Done For You?
Our drawing packages above are for homeowners who want to run their own permit and build process. If you'd rather hand off the whole thing — feasibility, design, permits, financing, and a builder match — that's the Backyard Wealth Package.
We turn your backyard into a rental unit. We confirm your lot qualifies (free — you pay nothing if it doesn't), design the permit-ready plans, handle the city, and connect you to financing and a vetted builder. One flat fee — about what an architect charges just to start. Yours would rent around $2,278/mo.
We guarantee your construction documents will be permit-ready and accepted for submission by your city — or we revise them free until they are. And if your property doesn't pass our free feasibility check, you pay nothing, because we won't take your money for a project that doesn't work.
We won't even take your money unless your property qualifies.
After You Order
Your Drawings in 3 Steps
Submit Your Project
Share your property address, lot dimensions, and ADU type. We'll confirm your order and assign your project coordinator.
We Draft Your Drawings
Our team designs your permit-ready drawing set — engineered for Manhattan Beach's building department requirements and CA code. Delivered in 10 business days.
Submit to Your City
Download your complete drawing package and submit directly to Building and Safety. We support corrections at no extra charge.
Real Projects · Verified Outcomes
ADU Projects Completed with Build With A Plan
Three representative project scenarios based on actual drawing packages delivered in California cities with similar market conditions to Manhattan Beach.
Build costs reflect local construction data for Manhattan Beach. Client names are initials only. Permit timelines are project-specific and may vary.
"Permit approved on the first submittal. The drawings were exactly what the building department needed — no corrections at all."
"We converted our two-car garage in under 6 months. Drawings were ready in 10 days — faster than any local firm we contacted."
"The JADU drawings included everything the city required. Submitted day 11, approved six weeks later. Tenant moved in two months after that."
Representative scenarios. Build costs modeled using Manhattan Beach construction data (city-verified data) and Building and Safety. Outcomes vary by project scope and site conditions.
Building Code
Manhattan Beach Climate Zone & Energy Code
California ADUs in Manhattan Beach must comply with the state's Title 24, Part 6 Energy Code, which requires high-performance windows, properly insulated wall and roof assemblies, whole-house fans for ventilation, electric heat pump water heaters, and third-party HERS verification of the building envelope, kitchen range hood, indoor air quality, and HVAC system performance.
Compare Cities
Manhattan Beach vs. Nearby California Cities
| City | Build Cost/sqft | Permit Fees | 1BR ADU Rent | Cap Rate | Eligibility |
|---|---|---|---|---|---|
| Manhattan Beach ← you | — | — | $2,278/mo | 5% | Free check → |
| Los Angeles | $300 | $3,500+ | $2,100/mo | 5% | View → |
| Long Beach | $400 | $3,000+ | $2,000/mo | 4.4% | View → |
| Glendale | $375 | $3,500+ | $2,067/mo | 5.2% | View → |
| Santa Clarita | $250 | $3,500+ | $2,270/mo | 5% | View → |
Frequently Asked
Manhattan Beach ADU Questions
How much does it cost to build an ADU in Manhattan Beach? +
What is the maximum ADU size allowed in Manhattan Beach? +
How long does the ADU permit process take in Manhattan Beach? +
Do I need owner-occupancy to build an ADU in Manhattan Beach? +
What's the rental income potential for an ADU in Manhattan Beach? +
How much does it cost to get ADU drawings in Manhattan Beach? +
What drawings are required for an ADU permit in Manhattan Beach? +
Can I convert my garage to an ADU in Manhattan Beach? +
Does Manhattan Beach have a coastal overlay for ADUs? +
What neighborhoods in Manhattan Beach are best for ADU investment? +
Is Manhattan Beach ADU-friendly? +
How much will an ADU increase my property value in Manhattan Beach? +
Can I use my Manhattan Beach ADU as a short-term rental (Airbnb / VRBO)? +
Does Manhattan Beach's seismic zone affect ADU construction requirements? +
Where do I submit ADU plans in Manhattan Beach? +
More Services in Manhattan Beach
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