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ADU Builders in Monrovia, CA

61 builders · ranked by Google rating and review volume · 21 CSLB license verified

★ Featured ADU builder

Featured ADU builder — this spot is open

Put your ADU company at the top of this page, in front of Monrovia homeowners who are comparing builders right now. Includes your logo, project photos, a direct call button and a link to your website.

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Located in Los Angeles County, Monrovia had a 2020 Census population of about 37,931. We found 61 ADU builders and contractors that show up for Monrovia homeowners on Google Maps, 2 of them based in the city itself. Their average Google rating is 4.8 stars. 25 market themselves specifically as ADU builders, and 1 mention garage conversions. 21 have a matched, active CSLB license shown with a verified badge. The top-rated by our review-weighted score are Zenith Builder, CAP Angeles Construction Inc and Teamup Construction.

Los Angeles leads California in ADU permits. Common projects here include garage conversions on older lots, detached backyard units on deep lots, and hillside sites where access and grading drive the cost.

#1

Zenith Builder

5.0 (46 Google reviews)
✔ CSLB License Verified #1035285

Service-area business · Temple City

Serves Monrovia · based in Temple City
Remodels & additions
CallWebsiteView profile
#3

Teamup Construction

5.0 (17 Google reviews)
✔ CSLB License Verified #1134224

35 N Lake Ave #710, Pasadena, CA 91101

Serves Monrovia · based in Pasadena
Remodels & additionsHome builderGeneral contractor
CallWebsiteView profile
#12

Enhaus Design Build

5.0 (11 Google reviews)
✔ CSLB License Verified #1104705

778 Alameda St, Altadena, CA 91001

Serves Monrovia · based in Altadena
Design-buildHome builderGeneral contractor
CallWebsiteView profile
#19

LUDIS INC

5.0 (7 Google reviews)
✔ CSLB License Verified #1061815

15 E McLean St, Alhambra, CA 91801

Serves Monrovia · based in Alhambra
Remodels & additionsHome builderGeneral contractor
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#21

The ADU Company

5.0 (6 Google reviews)
✔ CSLB License Verified #1118354

504 E Navilla Pl, Covina, CA 91723

Serves Monrovia · based in Covina
ADU specialistRemodels & additionsHome builderGeneral contractor
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#29

DMAX Construction

5.0 (4 Google reviews)

621 N Monte Vista Ave, San Dimas, CA 91773

Serves Monrovia · based in San Dimas
Remodels & additionsGeneral contractor
CallView profile
#35

ADU Experts

5.0 (3 Google reviews)

Service-area business · Azusa

Serves Monrovia · based in Azusa
ADU specialistGeneral contractor
CallView profile
#37

A.D.U. Builders

5.0 (2 Google reviews)
✔ CSLB License Verified #1080549

217 E Victoria Ave, Montebello, CA 90640

Serves Monrovia · based in Montebello
ADU specialist
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#40

LYF Design & Development Inc

5.0 (2 Google reviews)
✔ CSLB License Verified #1072862

1201 W Huntington Dr Unit 208, Arcadia, CA 91007

Serves Monrovia · based in Arcadia
General contractor
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#52

MF ADU

3.0 (2 Google reviews)

1979 Lake Ave, Altadena, CA 91001

Serves Monrovia · based in Altadena
ADU specialistHome builder
CallWebsiteView profile
#55

JLF ADU

No rating yet (0 Google reviews)
✔ CSLB License Verified #1075968

4716 N Fircroft Ave, Covina, CA 91722

Serves Monrovia · based in Covina
ADU specialist
CallWebsiteView profile
#59

Robles Inc ADU

No rating yet (0 Google reviews)

Service-area business · La Puente

Serves Monrovia · based in La Puente
ADU specialist
CallView profile
#61

ADU Express

No rating yet (0 Google reviews)

Service-area business · Duarte

Serves Monrovia · based in Duarte
ADU specialist
CallView profile

Permits and pre-approved plans in Monrovia

ADU permits in Monrovia go through the city's building or planning department. Under AB 1332, every California city and county had to set up a pre-approved ADU plan program by January 1, 2025, so ask Monrovia whether it has approved plans you can use. See our pre-approved plans guide and California ADU law summary.

Planning an ADU in Monrovia? Start here

SB 9 vs ADU: Lot Splits, Duplexes and Backyard Units in CaliforniaJADU vs ADU in California: Size, Rules, Cost and Which to BuildGarage Conversion ADU Cost in Southern California (and What Drives It)How to Choose an ADU Builder in Southern California: 15-Point Checklist

All ADU guides →

Monrovia ADU FAQ

How many ADU builders serve Monrovia?

Our directory lists 61 ADU builders and contractors that appear for Monrovia on Google Maps, including companies based in nearby Los Angeles County communities.

Do I need a permit to build an ADU in Monrovia?

Yes. ADUs need a building permit from the City of Monrovia, which must approve or deny a complete application within 60 days under state law. Many cities also offer pre-approved plans that speed up review.

How much does an ADU cost in Monrovia?

Most Southern California detached ADUs land around $350 to $550 per square foot all-in, garage conversions around $200 to $350, and JADUs around $50,000 to $150,000. Use our ADU cost estimator and get three itemized bids.

How are Monrovia ADU builders ranked here?

By Google rating weighted by the number of reviews, so a 4.9 with 200 reviews ranks above a 5.0 with 3. Featured placements are clearly labeled and don't affect the organic ranking.

Nearby cities in Los Angeles County

Los Angeles 118Long Beach 119Santa Clarita 27Glendale 117Lancaster 12Palmdale 12Pomona 67Torrance 98Pasadena 100Downey 28West Covina 68El Monte 24
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