ADU Company in San Dimas, CA
Lodgewick ADU Builders handles accessory dwelling units, garage conversions, and home additions across San Dimas, and we approach every job with one fixed rule: a written price before any work starts. What makes San Dimas different from nearby flat-terrain cities is the foothill factor. A meaningful share of northern San Dimas sits inside California-designated Very High Fire Hazard Severity Zones, which means many ADU permits here carry Chapter 7A wildfire-resistant construction requirements that never come up in La Verne or Covina. That changes materials, cost, and timeline, and it’s why we walk every San Dimas parcel before quoting. Call (254) 602-5618 and we’ll tell you exactly what your lot requires.
Why San Dimas Homes Are Different
San Dimas was built out during the San Gabriel Valley’s postwar boom, and the housing stock reflects it. Most homes here are 1955 – 1975 ranch-style and split-level tract houses with detached two-car garages and deep rear yards. That original footprint is actually good news for ADUs, because there’s physically room for a detached unit behind the house without touching the main structure. The bad news hides behind the walls. Homes from this vintage routinely still run on original 100-amp electrical panels, and many have galvanized supply plumbing that’s been quietly corroding in the area’s hard groundwater for decades. San Dimas building officials flag both for mandatory upgrade before they’ll sign off on an ADU permit, and we price those upgrades into our written quote from day one so they don’t surprise you mid-project.
Then there’s the terrain. San Dimas sits at the mouth of San Dimas Canyon in the Inland Valley heat basin. Summer highs regularly pass 105°F, 10 – 15 degrees hotter than coastal Los Angeles. That means the mini-split system we spec for a San Dimas ADU has to be sized for peak heat loads that a West Side contractor would significantly undersize. And in the northern quadrant of the city, against the San Gabriel foothills, fall Santa Ana winds push embers uphill. Any ADU on a hillside parcel in the city’s Very High Fire Hazard Severity Zones has to meet Chapter 7A standards: ember-resistant vents, Class A roofing assemblies, ignition-resistant exterior cladding. Flat-lot neighbors in the valley floor rarely deal with any of that. It’s a cost and permitting layer nobody should discover halfway through a build.
Our Main San Dimas Services
Most San Dimas homeowners come to us for one of three projects, and each has its own dedicated page where we break down local pricing and process in detail. Here’s how each one plays out on San Dimas’s particular lots.
Home Addition Contractor in San Dimas
Adding square footage to a 1955 – 1975 ranch or split-level in San Dimas means working around the original footprint, which usually has solid bones but outdated systems. We see a lot of 100-amp panel replacements and galvanized plumbing repipes folded into the addition scope because the city won’t pass final inspection without them. If your lot sits in the northern foothills, the addition also has to follow Chapter 7A cladding and venting rules, which changes the siding and soffit specifications from day one. We give you a written, line-item price that already accounts for the panel, the repipe, and the fire-zone compliance before we pull the permit. Home Addition Contractor in San Dimas
Garage Conversion Contractor in San Dimas
San Dimas’s detached two-car garages are almost purpose-built for conversion work, and a garage conversion is typically the fastest path to a permitted JADU. The catch is that most of these garages were never meant to be lived in. We routinely find uninsulated slabs, no vapor barrier, and single-circuit electrical that can’t support a kitchen or mini-split. We handle the full conversion with proper foundation moisture control, insulation, and a new subpanel sized for the added load, and we stage the work so your driveway stays usable. Every conversion gets a written price and a written 365-day guarantee before we start. Garage Conversion Contractor in San Dimas
ADU Builders in San Dimas
San Dimas’s 7,500 – 10,000+ sq ft lots on the valley floor are unusually good candidates for a paired setup: a garage-conversion JADU and a separate detached ADU on the same parcel. That combination works beautifully on flat lots but gets significantly more complicated once the project creeps uphill into fire-zone territory, where Chapter 7A materials and non-standard setbacks from horse-keeping overlays start to apply. We pull the full zoning and fire-overlay records from the city before we quote anything, so the price we give you reflects the real build, not a generic state-law ADU checklist. ADU Builders in San Dimas
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 San Dimas
We work hands-on with established prefab and panelized ADU systems, including Abodu, Cover, and Dvele, matched to your San Dimas lot’s size, slope, and fire-zone status. If we’re installing one of these systems, components are ordered and staged locally before the crew arrives, which keeps San Dimas permits moving on schedule. See our brands for the full range.
Pricing for ADU Company in San Dimas, CA
| Service | Typical range in San Dimas |
|---|---|
| Detached ADU (full build, turnkey) | $160,000 – $280,000 |
| Garage conversion to JADU | $85,000 – $145,000 |
| Prefab ADU installation (Abodu, Cover, Dvele) | $120,000 – $220,000 |
| Home addition (primary suite or family room) | $90,000 – $190,000 |
| 100-amp panel upgrade | $3,500 – $6,000 |
| Galvanized plumbing repipe (partial, tied to ADU scope) | $4,000 – $9,000 |
| Chapter 7A fire-zone compliance package | $8,000 – $22,000 |
| Mini-split HVAC for ADU | $5,000 – $10,000 |
What pushes a San Dimas price toward the top of the range is almost always the fire-zone overlay on northern hillside parcels, which layers on Chapter 7A cladding, ember-resistant venting, and Class A roofing costs that flat-lot projects never see. The second big variable is the age of your home’s electrical and plumbing, because a 1958 ranch with the original 100-amp panel and galvanized supply lines will need upgrades before the city signs off. Whatever your parcel requires, the price we hand you in writing is the price you pay. That’s The Kingswell Guarantee, and it’s on every San Dimas project.
Neighborhoods We Serve in San Dimas
We work across the full spread of San Dimas, from the valley-floor tracts near the 57 down to the foothill streets climbing toward the canyon. Crews stage locally for San Dimas jobs, so the estimate visit and the build both start on the schedule we put in writing.
- Downtown San Dimas and the Bonita Ave corridor
- The tract-home neighborhoods south of Arrow Hwy
- Northern foothill parcels inside the fire hazard zones
- Horse-keeping neighborhoods near San Dimas Canyon
- Streets bordering Puddingstone Reservoir
Service Area – Cities Near San Dimas
While this page is focused on San Dimas, our crews also cover the neighboring San Gabriel Valley communities that share the same housing stock and similar ADU permit realities. If you’re up the road, start with the right city page: La Verne, CA, Glendora, CA, Covina, CA, or Azusa, CA. Each page has local pricing and local conditions for that specific city.
Serving San Dimas, CA - Our Local Coverage Area
We’re based in the San Dimas 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 San Dimas
We can typically get an estimate visit scheduled within days of your call, and once you approve the written price we move straight into permit drawings and city submittal. San Dimas building review times vary with the fire-zone overlay and current queue, but we keep the process moving and you’ll know the timeline in writing before we start. Call (254) 602-5618 to get on the schedule.
If your parcel sits in the city’s Very High Fire Hazard Severity Zone, yes. The city will require Chapter 7A wildfire-resistant construction, including ember-resistant vents, Class A roofing, and ignition-resistant cladding. We pull the fire-overlay records from the city before quoting so the compliance cost is in your written price from the start, not added later.
Very often, yes. Original 100-amp panels and galvanized supply lines are common in this housing stock, and San Dimas building officials routinely require both to be upgraded before they’ll sign off on an ADU permit. That work goes into your written quote as a line item, so there’s no door-step surprise. For an exact figure on your property, call (254) 602-5618 for a free estimate.
If you’re weighing an ADU, garage conversion, or addition in San Dimas, the easiest next step is a free estimate with a written price. Call (254) 602-5618 and we’ll walk your lot, pull the zoning and fire records, and hand you a number you can actually plan around.
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 San Dimas Customers Say
"The ADU came out beautiful and the permitting, which terrified me, was handled start to finish. They kept me updated every week so I was never wondering what was happening."
- Shauna Mills"A whole backyard ADU from scratch. Terrified me going in, but they kept me updated weekly and there were no nasty surprises. Quality work and a fair price."
- Noreen Fletcher"Built a backyard unit for my mother in law. They handled the permits, gave me a real timeline, and stuck to it within a few days. The written price is what we paid, which anyone who's done construction knows is rare."
- Dennis Fairchild