A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in Colton, CA
Fielding ADU Builders handles ADU construction, garage conversions, and room additions in Colton, CA. Colton’s housing stock runs older than a lot of the Inland Empire, which means we’re usually working around slabs from the 1950s and 1960s, existing electrical panels near capacity, and zero-lot-line setbacks that need a variance before the first footing is dug. Reed Calloway leads the Fielding team and holds every Colton project to a simple standard: written price first, permitted work by the book, and a one-year written guarantee on the finished job. Call (361) 315-4177 to talk through your project.
Why Colton Homes Are Different
Colton sits in the warm, dry band of the San Bernardino Valley, and that shapes how we build here. Summer heat climbing past 100 degrees drives insulation choices, window placement, and cooling loads. Homes in older parts of town, especially around La Cadena Drive and Valley Boulevard, were built before current energy codes and before the ADU ordinance existed. That means we’re commonly upgrading main panels, running new subpanels, and pulling permits for work the original house never had.
Lot geometry matters in Colton. Many residential parcels are narrower than what newer tract developments provide, so accessory structures often require a setback variance (the city’s written permission to build closer to the property line than the standard rule allows). We work that road before you pay for plans, because there’s no point drawing a unit that can’t be permitted. HOA oversight is light compared with Highland or Loma Linda, but several pockets do have design-review requirements, and we confirm that before framing begins.
Our Main Colton Services
Two types of work dominate the calls we field in Colton: adding attached living space and converting existing structures into rentable or family units. Each has its own Colton page with pricing and detail.
Room Addition Contractor in Colton
Room additions in Colton usually mean extending a home on an existing slab, matching roof lines, and tying into older framing that was not always built square. We handle the structural connection, the new HVAC run, and the permit set as one job. Reed’s crews pull the permit, schedule inspections, and leave the site clean. If you’re considering a larger add-on off the back or a bump-out along the side, see the full pricing and scope on the Room Addition Contractor in Colton page.
Garage Conversion Contractor in Colton
Garage conversions are common in Colton’s older tracts, where detached and attached garages were built generously. Converting one into a studio or one-bedroom unit means raising the floor to meet living-space requirements, adding insulation to walls that were never insulated, and often running new sewer lines. We also confirm the existing roof and framing can hold the added ceiling load. Details and current price ranges are on the Garage Conversion Contractor in Colton page.
ADU Builders in Colton
A new detached ADU in Colton gives you a separate addressable unit in the backyard without touching the main house. We work with prefab platforms like Abodu, Cover, and Dvele when the site suits a modular approach, and frame conventional units when the lot calls for it. Setbacks, utility trenching, and drainage are the big variables on Colton lots. See the full build process and unit options on the ADU Builders in Colton page.
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 Colton
We install and service James Hardie siding on conventional builds, and work with Abodu, Cover, and Dvele prefab platforms where the site and budget fit. Material turnaround in Colton runs one to three weeks for most orders; structural panels and windows usually arrive first. See our brands for the full list and what each platform offers.
Pricing for ADU Company in Colton, CA
| Service | Typical range in Colton |
|---|---|
| Detached ADU (prefab, 400 – 600 sq ft) | $180,000 – $310,000 |
| Detached ADU (site-built, 750 – 1,200 sq ft) | $250,000 – $420,000 |
| Garage conversion (attached, 300 – 500 sq ft) | $65,000 – $145,000 |
| Garage conversion (detached, finished studio) | $90,000 – $175,000 |
| Room addition (300 – 500 sq ft) | $85,000 – $175,000 |
| Room addition (500 – 800 sq ft, with bathroom) | $140,000 – $270,000 |
| Full electrical panel upgrade (if required) | $2,800 – $5,500 |
| Site prep, trenching, and foundation | $18,000 – $48,000 |
| Permit set, city fees, and inspections | $6,000 – $18,000 |
What pushes Colton prices up is usually the lot, not the structure: narrow setbacks, older panels, or sewer lines that need relocation. Whatever the number ends up as, it goes in writing before any work starts, and that written price is what you pay at the end. The Garrison Standard covers workmanship defects for 365 days; if something fails, we come back and make it right at no charge.
Neighborhoods We Serve in Colton
We work all of Colton and the unincorporated pockets that border it. Response time for a site visit runs one to three business days, depending on how many projects are already underway.
- Reche Canyon
- La Cadena Drive corridor
- Valley Boulevard neighborhoods
- Mt. Slover area
- Grand Terrace border
Service Area – Cities Near Colton
Fielding ADU Builders also handles ADU, garage conversion, and room addition work in nearby cities. Homeowners in Grand Terrace, CA, Loma Linda, CA, Riverside, CA, and San Bernardino, CA often call us for the same Colton-level written pricing and guarantee.
Serving Colton, CA - Our Local Coverage Area
We’re based in the Colton 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 Colton
Yes. We pull the permit set, schedule inspections, and stand with the inspector on site. Every Fielding ADU Builders project in Colton is permitted works. We recommend a professional manage the permit set so nothing gets missed that would hold up final approval.
Most Colton neighborhoods do not have active HOAs, but a few pockets do. If your property has one, we submit whatever design-review package it asks for before we start. The city permit and any HOA requirement are separate, and we handle both.
We schedule the first site visit within one to three business days in Colton. Actual construction start depends on the permit queue and what needs upgrades, like panels or sewer lines. Call (361) 315-4177 to get your property on the schedule for a free estimate.
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 Colton Customers Say
"Garage conversion with a new bath and kitchenette. Permit was handled by them. Inspection passed first time."
- Sheila B."Honest feedback on what the lot could fit. Told me up front what would fit on the lot and what the setbacks would allow."
- Rita C."Clear price breakdown. Change orders were all in writing."
- Hal P.
