Murrieta ADU Builder by Full Circle Builders Inc. · CSLB #1009685
(951) 723-7132 Get a Free Quote
Murrieta · Greer Ranch · Spencer's Crossing · Copper Canyon · Central Park

Murrieta's ADU builder. Design, permit, build — turnkey.

Detached ADUs, attached ADUs, garage conversions, and JADUs across Murrieta and the surrounding Inland Empire. We build to current Murrieta ADU standards, handle plan check, build from the City's Pre-Approved ADU plan library, and self-perform foundation, framing, and finish with one licensed crew. CSLB #1009685.

Get a Free Murrieta ADU Quote (951) 723-7132
20+ yrsBuilding in Riverside County
4.9 ★47 Google reviews
CSLBLicense #1009685
Up to 1,200 ft²Detached ADUs by-right
A finished detached ADU backyard cottage in a Murrieta, California suburban yard at golden hour, with an olive tree and distant mountain backdrop.
Up to 1,200 sq ftMurrieta detached ADU
CSLB #1009685Licensed & Insured
Pre-Approved PlansCity of Murrieta IB-113
DIR RegisteredPublic works contractor
Since 2004Serving Riverside County
Murrieta ADU types we build

Four paths to a Murrieta ADU. We build them all.

Every Murrieta lot is different. Whether you want a 1,200 sq ft detached backyard cottage in Greer Ranch, a fast garage conversion in California Oaks, or a budget-friendly JADU — we'll help you pick the right path, then design, permit, and build it.

Finished detached ADU in a Murrieta backyard with white stucco, dark metal roof, large sliding glass door, and mountain backdrop at golden hour.
Most popular · Detached ADU

Detached ADUs in Murrieta

A standalone backyard cottage — the highest rental-income option and the path most Murrieta homeowners choose. Sized from 500 sq ft studios up to a full 1,200 sq ft two-bedroom, built to California Title 24 with all utilities and finishes in-house.

  • 500–1,200 sq ft permitted detached ADUs
  • City of Murrieta plan check handled end-to-end
  • Foundation, framing, MEP, finish — one in-house crew
  • Typical Murrieta detached ADU cost: $200,000–$320,000
  • 6–9 months from signed contract to keys
Start your Murrieta detached ADU →
Completed Murrieta garage conversion ADU with cream stucco, two large picture windows replacing the garage door, and a side entry with awning.
Fastest · Lowest cost

Garage Conversion ADUs in Murrieta

Many Murrieta homes have oversized 2- or 3-car garages that convert beautifully into 400–600 sq ft ADUs. Reusing the existing slab and walls cuts $40K–$80K compared to new construction — the fastest, most affordable way to add a rentable unit.

  • 400–600 sq ft typical — studio or one-bedroom
  • Reuses existing foundation and shell
  • Typical Murrieta garage conversion cost: $60,000–$120,000
  • 3–5 months total timeline
Convert my Murrieta garage →
Bright interior of a finished accessory dwelling unit with white kitchenette, vaulted wood-beam ceiling, sofa, and queen bed in a single open studio space.
Budget-friendly

Junior ADUs (JADU) in Murrieta

Have a four- or five-bedroom Murrieta home where a room rarely gets used? A JADU converts one bedroom into a self-contained 500 sq ft unit with its own entrance and kitchenette — the most affordable Murrieta ADU option, often permitted faster too.

  • Up to 500 sq ft, within the existing home footprint
  • Separate exterior entrance and kitchenette
  • Typical Murrieta JADU cost: $30,000–$70,000
  • 2–4 months total timeline
Get a JADU quote →
Modern farmhouse style ADU at twilight in a Murrieta backyard with white board-and-batten siding, dark metal roof, glowing interior lights, and a covered porch.
Multigenerational fit

Attached ADUs in Murrieta

An extension of your existing Murrieta home with its own private entrance — a practical fit for multigenerational families. Shares walls and utility connections, which keeps cost below a fully detached build while giving occupants real independence.

  • Up to 1,200 sq ft (or 50% of the main home)
  • Shared utility tie-ins lower install cost
  • Typical Murrieta attached ADU cost: $120,000–$200,000
  • 5–7 months total timeline
Add an attached ADU →
City of Murrieta Pre-Approved ADU Program

Built to Murrieta's pre-approved ADU plans — and California ADU law.

The City of Murrieta runs a Pre-Approved ADU Program (Information Bulletin IB-113) — plans already reviewed by the City that homeowners can build with a faster, lower-cost permit submittal. We build from the pre-approved library and handle the submittal end-to-end, alongside California's statewide ADU rules: detached & attached ADUs up to 1,200 sq ft, a 16-ft height limit for detached units, and 4-ft side and rear setbacks.

Common pre-approved & permitted ADU sizes

Studio~400–500 sq ft
1 BR / 1 BA~600 sq ft
2 BR / 1 BA~750 sq ft
2 BR / 2 BA~900 sq ft
3 BR / 2 BAup to 1,200 sq ft

Source: City of Murrieta Building & Safety, Plan Check & Permits and Pre-Approved ADU Program (IB-113). Murrieta's online permitting system handles ADU/JADU submittals 24/7.

Pre-approved plan library

City-reviewed plans mean faster plan check and lower design cost than a full custom ADU.

Ministerial approval

Compliant ADU plans are approved over the counter — no discretionary design review or public hearing.

Impact fees waived under 750 sq ft

State-mandated fee waiver applies in Murrieta — thousands saved on smaller ADUs.

Online permitting

We submit, track, and pay through Murrieta's online permit center for the fastest path to approval.

HOA review handled

Stucco, roof, paint and trim matched to your primary home for clean architectural-committee approval.

About the CalHFA $40,000 ADU grant: The statewide CalHFA ADU Grant Program has been closed to new applications since December 2023, and no new funding round has been announced as of 2026. Be cautious of anyone promising the grant — CalHFA has warned such offers are scams. We monitor grant and financing programs and will help you package a submittal if funding reopens.
Ask about pre-approved plans View City permitting page
Where we build

Building ADUs across Murrieta — every neighborhood.

We work every Murrieta neighborhood and the surrounding Riverside County communities. Same crew, same license, same standards.

Greer RanchNorth Murrieta
Spencer's CrossingEast Murrieta
Copper CanyonCentral Murrieta
Central ParkCentral Murrieta
Bear CreekWest Murrieta · golf
California OaksWest Murrieta
Alta MurrietaEast Murrieta
Murrieta Hot SpringsNortheast Murrieta
Rancho Bella VistaSoutheast Murrieta
Los Alamos HillsNorth Murrieta
The Colony55+ community
Vintage ReserveSouth Murrieta
TemeculaAdjacent
WildomarAdjacent
MenifeeAdjacent
Inland EmpireRiverside County

Headquartered at 26111 Ynez Rd. Ste B28, Temecula, CA 92591 — minutes from Murrieta. We build ADUs across Murrieta, Temecula, Wildomar, Menifee, and the wider Inland Empire.

Why Murrieta homeowners choose us

One Murrieta crew. Every ADU trade. No subcontractor roulette.

Most contractors hand your ADU job off to a rotating cast of subs. We don't. The same self-performing crew that pours your foundation frames your walls, hangs your finish, and walks the final inspection with the City of Murrieta.

City of Murrieta ADU expertise

We build to Murrieta's ADU standards line by line — setbacks, height, parking exemptions, impact-fee waivers under 750 sq ft, and the Pre-Approved ADU Program. That precision is what gets your ADU through plan check the first time.

Self-performing multi-trade crew

Concrete, masonry, framing, finish carpentry, painting — all in-house. Fewer handoffs means tighter build schedules, predictable cost, and a single point of accountability from groundbreaking to keys.

Rental income & multigenerational living

A permitted Murrieta ADU can rent for roughly $2,100/mo (1BR) to $2,400/mo (2BR) at current market rates — or house aging parents and adult kids without selling the family home. We design every ADU around the outcome you want.

Local since 2004

Headquartered minutes away in Temecula, we've built across Murrieta, Greer Ranch, Spencer's Crossing, Copper Canyon, Central Park, Bear Creek, California Oaks, Murrieta Hot Springs, Temecula and Wildomar since 2004. We know the soil, the slopes, the HOA committees, and the inspectors.

How we work

A clear path from quote to keys.

No mystery, no missed updates. You'll know what's happening, when, and what comes next at every stage.

Free consultation & quote

Walk your Murrieta site with us, talk through scope and budget, and get a written quote with a firm scope of work. No deposit required to start.

Design & permitting

We handle architectural drawings, structural engineering, and the full submittal through the City of Murrieta — pre-approved plan or custom — via the online permit center.

Build with one crew

Your project runs through our self-performing crew with daily progress photos and a client portal so you can track every milestone.

Final walk & warranty

Punch list, final inspection, and a written warranty on workmanship. We pick up the phone after the project is done — that's the "full circle."

What Murrieta homeowners say

A 4.9★ average from 47 verified reviews.

Real ADU outcomes from Murrieta, Greer Ranch, Spencer's Crossing, and surrounding Inland Empire homeowners we've built for.

★★★★★

"They built a 1,200 sq ft detached ADU in our Greer Ranch backyard — stucco and roof tile matched our main house perfectly. From signed contract to renter moving in was under nine months. Permits, foundation, hookups — all handled."

Sarah M. Murrieta — Greer Ranch · Detached ADU, 2025
★★★★★

"We converted our oversized two-car garage in California Oaks into a 600 sq ft JADU for my mom. Permits through the City of Murrieta, plumbing, kitchenette, separate entrance — done in five months and she loves the privacy."

Jason & Erika R. Murrieta — California Oaks · JADU / Garage Conversion, 2024
★★★★★

"800 sq ft detached ADU on our Spencer's Crossing lot — grading, separate utility meter, the works. Full Circle's crew understood Murrieta permitting better than any other GC we interviewed."

Michael T. Murrieta — Spencer's Crossing · Detached ADU, 2024

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Common Murrieta ADU questions

Murrieta ADUs — cost, permits, timelines, income.

How much does an ADU cost in Murrieta, CA?
In Murrieta, a turnkey permitted ADU typically runs $30K–$70K for a JADU (up to 500 sq ft inside the main house), $60K–$120K for a garage conversion, $120K–$200K for an attached ADU, and $200K–$320K for a detached ADU up to 1,200 sq ft. Final pricing depends on size, site conditions, finishes, and whether new water, sewer, or electrical connections are required.
Does Murrieta have pre-approved ADU plans?
Yes. The City of Murrieta runs a Pre-Approved ADU Program (Information Bulletin IB-113) — a library of plans already reviewed by the City that homeowners can build with a faster, lower-cost permit. We build from the pre-approved library and handle the submittal end-to-end, or design a custom ADU when your lot needs it. Details are on the City of Murrieta Plan Check & Permits page.
How big can my ADU be in Murrieta?
Murrieta follows California state ADU law: detached and attached ADUs are allowed up to 1,200 sq ft on single-family lots, with a 16-ft height limit for detached units (taller near transit or when attached to a two-story home). JADUs are capped at 500 sq ft inside the existing home. Side and rear setbacks are 4 feet, and no setback is required when converting an existing structure. We run a free feasibility check on your parcel before any design work.
How long does it take to build an ADU in Murrieta?
From signed contract to keys, a typical Murrieta ADU runs 6–9 months for a detached build and 3–5 months for a garage conversion or JADU. California law requires ministerial approval of compliant ADU plans within 60 days, and Murrieta's online permitting system speeds submittals; on-site work — foundation, framing, MEP, finish — takes 12–20 weeks depending on size and finish level.
Can I rent out my Murrieta ADU? How much can I earn?
Yes — long-term rentals of 30 days or more are allowed for Murrieta ADUs; short-term rentals under 30 days are not permitted. Based on current Murrieta market data, average rents run roughly $2,100/mo for a 1-bedroom and $2,400/mo for a 2-bedroom. A typical detached ADU generates roughly $25K–$30K of gross annual rental income.
Is the CalHFA $40,000 ADU grant still available?
No. The CalHFA ADU Grant Program (up to $40,000 for pre-development costs) has been closed to new applications since December 2023, and no new funding round has been announced as of 2026. CalHFA has warned that anyone promising to get you the grant is likely running a scam. We monitor grant and ADU financing programs and will help you package a submittal if a new round opens. See the official CalHFA ADU page for current status.
What is Full Circle Builders' CSLB license number?
Full Circle Builders Inc. holds California Contractors State License Board (CSLB) license #1009685 (Class B General Building) and is DIR-registered for public works. You can verify the license anytime at the CSLB License Check.
Does my Murrieta HOA allow ADUs?
Under California Government Code Section 66314, HOAs cannot prohibit ADUs on single-family lots, though they can enforce reasonable design standards. Most master-planned Murrieta communities — Greer Ranch, Spencer's Crossing, Bear Creek, Copper Canyon, Central Park, Rancho Bella Vista — require architectural review. We coordinate directly with your HOA committee — submittals, exterior finishes, color matching — in parallel with the City permit so you don't lose calendar time.
Free Murrieta ADU consultation

Free Murrieta ADU consultation & quote.

Tell us about your Murrieta lot and what you want to build. We'll walk you through ADU compliance, the Pre-Approved Plan program, timeline, and a real turnkey number — no deposit, no obligation.

📞(951) 723-7132Monday–Saturday, 8am–5pm ✉️info@fullcirclebuildersinc.comWe reply within one business day 📍26111 Ynez Rd. Ste B28, Temecula, CA 92591Serving Murrieta, Greer Ranch, Spencer's Crossing & surrounding 🏛️City of Murrieta — Building & SafetyPlanning 951-461-6061 · Building 951-461-6062 · 1 Town Square

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Part of the Full Circle Builders family

Murrieta ADU Builder is a service of Full Circle Builders Inc.

We're the ADU-focused arm of Full Circle Builders Inc. — a licensed California general contractor (CSLB #1009685) serving Riverside County since 2004. Beyond ADUs, our parent company handles custom homes, kitchen and bath remodels, room additions, commercial buildouts, and public-works projects across the Inland Empire.

Visit our main site → See TemeculaADUBuilder.com See MenifeeADUBuilders.com