ADU Company in Monrovia, CA
We’re Lodgewick ADU Builders, and we handle accessory dwelling units, garage conversions, and home additions in Monrovia, California. Monrovia isn’t like its neighbors. An older Craftsman near Myrtle Avenue with a 1920s alley garage faces completely different rules than a 1960s ranch on Foothill. The foothill parcels carry wildfire construction codes; the flatland lots face historic design review. We work through both every week. Call (254) 602-5618 to talk through your lot.
Why Monrovia Homes Are Different
Monrovia’s housing stock splits into two distinct worlds, and your ADU path depends entirely on which one you live in. The flatland neighborhoods around Old Town and Myrtle Avenue are dense with 1910s to 1940s Craftsman bungalows, most of them backed by alleys with detached garages in the 400-square-foot range. That footprint is nearly ideal for a by-right garage conversion under California’s streamlined ADU laws. But those same properties sit under Monrovia’s Historic Preservation Commission design review, which still governs exterior materials and window placement even after state law removed most local ADU roadblocks. The result is a tension that doesn’t exist in Arcadia, CA or Duarte, CA: state law says yes, but the historic overlay still wants a say in what the outside looks like.
The second Monrovia is the foothill side. The northern streets climbing into the San Gabriel Mountains fall inside a Very High Fire Hazard Severity Zone. Any ADU built up there must meet wildland-urban interface standards: Class A roofing, ember-resistant vents, and ignition-resistant siding. That changes both the cost and the material choices. A detached ADU in the foothills carries a different budget than an identical unit on a flat lot south of Foothill Boulevard. We price accordingly, and we explain the difference in writing before any work begins.
Our Main Monrovia Services
Monrovia homeowners call us most often about three things: adding square footage to an existing home, converting an old detached garage into a rentable unit, and building a new ADU from the ground up. Each one works differently on a Monrovia lot, so each has its own dedicated page.
Home Addition Contractor in Monrovia
Additions in Monrovia usually mean expanding a Craftsman bungalow without losing its street-facing character, or pushing out the back of a 1950s ranch to capture foothill views. On historic-district properties, the addition that faces the street stays under design review, while rear additions typically move faster. Lot coverage limits and setback rules vary block by block here, which is why we do a parcel-specific review before quoting. The written price we give you is the price we build to. Full details on the dedicated page: Home Addition Contractor in Monrovia.
Garage Conversion Contractor in Monrovia
The alleys behind Myrtle Avenue and the surrounding Craftsman blocks are full of detached garages built in the 1920s and 1930s. They’re the single most common ADU conversion target in Monrovia, and state law allows many of them as ministerial permits. But Monrovia’s Historic Preservation Commission still wants exterior changes to stay compatible with the original architecture, which affects siding, window style, and roof lines. We handle the design review submittal as part of the project. Full details on the dedicated page: Garage Conversion Contractor in Monrovia.
ADU Builders in Monrovia
A new detached ADU gives Monrovia homeowners the most layout freedom, especially on the larger post-war lots in the eastern and central parts of the city where historic scrutiny doesn’t apply. On the foothill side, we build to wildfire code as a matter of course, not as an add-on. On the flatlands, we handle the design review process for you. The Kingswell Guarantee applies every step of the way: written price first, real arrival window, clean job site, written guarantee at the end. Full details on the dedicated page: ADU Builders in Monrovia.
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 work directly with leading ADU and materials brands including Abodu, Cover, and Dvele for prefab units, plus James Hardie siding for both historic-compatible and wildfire-rated exteriors. Parts and panel sets are ordered early to keep Monrovia schedules on track. See the full list on our brands page.
Pricing for ADU Company in Monrovia, CA
| Service | Typical range in Monrovia |
|---|---|
| Detached ADU (new construction, flatland) | $185,000 – $310,000 |
| Detached ADU (new construction, foothill wildfire zone) | $210,000 – $355,000 |
| Garage conversion ADU (attached, interior remodel) | $95,000 – $175,000 |
| Garage conversion ADU (detached, historic district design review) | $110,000 – $195,000 |
| Home addition (primary bedroom suite) | $130,000 – $230,000 |
| Home addition (kitchen expansion, 150 – 250 sq ft) | $90,000 – $160,000 |
| JADU (junior ADU inside existing home) | $60,000 – $115,000 |
| Site preparation / foundation work | $15,000 – $45,000 |
| Utility connections (sewer, power, water) | $8,000 – $25,000 |
The two big price drivers in Monrovia are historic design review compliance on the flatland Craftsman blocks and wildland-urban interface materials in the northern foothill zone. Both add real cost, and both are knowable before we quote. You get a written price before any work starts, and that number does not change at the door.
Neighborhoods We Serve in Monrovia
We work across Monrovia’s flatlands and foothill neighborhoods. Scheduling is coordinated from our Los Angeles office, with crews dispatched locally to Monrovia jobs. Our standard arrival window is a two-hour block given to you in writing before work begins.
- Old Town / Myrtle Avenue Craftsman district
- North Monrovia foothill parcels (wildfire zone)
- East Monrovia post-war ranch neighborhoods
- Central Monrovia
- South Monrovia flatland lots
Service Area – Cities Near Monrovia
Beyond Monrovia, we serve nearby San Gabriel Valley communities. Homeowners in Arcadia, CA deal with different lot patterns and design standards, Duarte, CA has its own hillside considerations, Sierra Madre, CA sits in an even stricter wildland zone along the mountain edge, and Baldwin Park, CA offers flatter, simpler ADU conditions. Call (254) 602-5618 and tell us which city you’re in; we’ll route you to the right team.
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 send local crews to Monrovia every week. Scheduling and dispatch are coordinated from our Los Angeles office, but the people who show up on your lot are background-checked, uniformed, and familiar with Monrovia’s historic overlay and foothill fire codes. Call (254) 602-5618 to get a Monrovia estimate started.
It adds a design review step for any exterior change visible from the public right-of-way on a designated historic property. That typically extends the permitting timeline by four to eight weeks. We prepare and submit the design review package as part of the project, so you’re not managing a second process. Call (254) 602-5618 and we’ll check whether your specific parcel falls under the overlay.
You’ll need Class A roofing, ember-resistant vents, and ignition-resistant siding, all required by California’s wildland-urban interface building standards. These add roughly 10 to 15 percent to the materials cost compared to a flatland ADU. We quote those costs up front, in writing. Call (254) 602-5618 for an exact number on your lot.
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
"Garage conversion into a studio for our teenager. Honest about what was realistic and what wasn't, finished close to schedule, and cleaned up the site daily."
- Marcus Beaumont"I was nervous about adding on but they walked me through every step and every cost before we started. No surprise change orders halfway through like I'd heard horror stories about."
- Eleanor Pratt"Junior ADU conversion inside the house. They protected the rest of our place with plastic and daily cleanup. Done nearly on schedule and on the number they quoted."
- Sabrina Veld