A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in Monrovia, CA
Fielding ADU Builders handles accessory dwelling units, garage conversions, and room additions across Monrovia, CA. Most homes here sit on compact foothill lots, and many were built between the 1910s and 1960s, which means the work rarely follows one template. Setbacks run tight, some streets climb steeply toward the San Gabriels, and the city wants permits done right. Call (361) 315-4177 to get a written price before anyone swings a hammer.
Why Monrovia Homes Are Different
Monrovia’s terrain and housing stock change how we build. A garage conversion on a flat lot off Foothill Boulevard looks different from one on a hillside street near Canyon Park. Slopes add foundation work, grading, and sometimes retaining walls. The older bungalows and mid-century ranch homes common north of the 210 often lack the panel capacity and sewer slope a new ADU needs, so electrical and plumbing upgrades get built into the estimate before the number goes in writing.
City permit review here is methodical. Setback variance requests, a written permission to build closer to a property line than the standard rule allows, come up regularly because lots are narrow. Historic district rules also apply in parts of North Monrovia, which can affect exterior finishes. We handle that paperwork as part of the build, not as a surprise. The Garrison Standard stays the same in Monrovia: written price first, permit done by the book, one full year of written guarantee after the work is done.
Our Main Monrovia Services
Homeowners in Monrovia most often call us about adding square footage to the main house or converting what they already have. Each service has its own page with pricing, process, and permit detail.
Room Addition Contractor in Monrovia
Room additions in Monrovia often mean extending a ranch home outward or building up on a sloped lot. The city checks foundation, shear wall, and roof tie-in details carefully, and hillside work triggers additional engineering. We write the full scope and price before work begins and pull every permit. See Room Addition Contractor in Monrovia for typical ranges and timelines.
Garage Conversion Contractor in Monrovia
Garage conversions are the fastest path to a rental unit or in-law suite, but Monrovia garages built before modern codes often need footing reinforcement and panel upgrades. Lot grading also dictates drainage details. We handle the full conversion with a written quote and a one-year Guarantee. Details are on the Garage Conversion Contractor in Monrovia page.
ADU Builders in Monrovia
Backyard ADUs in Monrovia range from prefab units set on a foundation to full custom builds. Our work with Abodu, Cover, and Dvele gives homeowners a faster path through design review, and conventional framed builds using James Hardie siding fit tighter custom lots. Read ADU Builders in Monrovia for options, price ranges, and Monrovia-specific permit notes.
What happens when you call
- 1
A real person answersNo phone trees - you reach a local pro.
- 2
You get an upfront price rangeHonest numbers before anyone is dispatched.
- 3
A background-checked tech heads outLicensed & insured, dispatched right away.
- 4
You approve before work beginsNothing starts until you say go.
Brands We Service in Monrovia
We build with James Hardie siding, Abodu, Cover, and Dvele systems, and coordinate parts delivery to Monrovia job sites directly. Most material orders are confirmed within a few days. See our brands for the full build-method list.
Pricing for ADU Company in Monrovia, CA
| Service | Typical range in Monrovia |
|---|---|
| Garage conversion (interior-ready shell) | $85,000 – $145,000 |
| Garage conversion (full unit with kitchen/bath) | $120,000 – $190,000 |
| Prefab ADU (Abodu, Cover, or Dvele, 450 – 600 sq ft) | $180,000 – $290,000 |
| Custom framed ADU (800 – 1,000 sq ft) | $240,000 – $390,000 |
| Room addition (primary suite, 250 – 400 sq ft) | $95,000 – $175,000 |
| Room addition (family room, 400 – 600 sq ft) | $140,000 – $240,000 |
Hillside lots, retaining walls, and panel upgrades push costs higher in Monrovia. The price you approve on day one is the price on the final invoice, no change orders and no door-knock surprises.
Neighborhoods We Serve in Monrovia
We work across all of Monrovia, including the flatter streets below Foothill and the hill streets north of Hillcrest. Every job gets a written price and a live person on the phone when you call.
- North Monrovia
- Old Town Monrovia
- Mayflower Village
- Monrovia Foothills
- South Monrovia
Service Area – Cities Near Monrovia
Alongside Monrovia, our crews also serve Arcadia, CA, Duarte, CA, Sierra Madre, CA, and Baldwin Park, CA. Scheduling and dispatch are coordinated from our Los Angeles office; crews are local to the San Gabriel Valley.
Serving Monrovia, CA - Our Local Coverage Area
We’re based in the Monrovia area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs About ADU Company in Monrovia
We schedule estimates within a few days, and someone answers the phone around the clock. Monrovia inspections are city-scheduled, so timeline estimates are set after the permit application is filed.
Yes. Monrovia requires building, electrical, plumbing, and sometimes grading permits for ADU work, and we handle the entire package. Homeowners never file on their own with us.
No. The price goes in writing before work begins. If a hidden site condition, such as failing foundation soil or outdated sewer line, requires a change, we write it up and get your approval before any added work happens.
The Garrison Standard covers workmanship defects for 365 days. If something fails in that year, we come back and correct it at no charge.
Call (361) 315-4177 to schedule your free Monrovia estimate and get the price in writing.
What happens when you call
- 1A real person answersNo phone trees - talk to a local adu pro.
- 2You get an upfront price rangeHonest numbers before anyone is dispatched. No surprises.
- 3We come out and measureLicensed & insured, at a time that suits you - the visit and the quote are both free.
- 4You get the price in writingLine-itemed, yours to keep, and nothing starts until you say go.
What Monrovia Customers Say
"Solid job. Cabinet delivery was a week behind but they worked around it."
- Ben G."Insulation, drywall, and finishes were all well done. Feels like part of the house."
- Pete O."Built a detached ADU behind our house. The builder is a veteran and runs the site like a platoon: schedule posted, crew on time, everything labeled. Finished within a few days of the date."
- Ken W.
