Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
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AfterFast, Reliable Home Additions & ADU Across Wildomar
A home addition or ADU in Wildomar typically runs $45,000-$130,000, and the real question isn’t the price tag - it’s whether your contractor understands what happens to a slab when it sits on shrink-swell clay through a Wildomar summer. We do. Barrett & Sons Construction has worked in enough 92595 backyards to know that a post-tension slab from a 2005 tract build shifts in ways a pier-and-beam never will, and that a detached ADU off McVicar Street needs a different footing spec than one off Palomar. Call (877) 610-1318 and you’ll get Tom Barrett or one of his sons on the line, not a call center.
Why Barrett & Sons Construction Is Wildomar’s Preferred Home Additions & ADU Company
We’re the name-on-the-truck crew serving Wildomar, and the truck actually shows up. Tom Barrett founded this company in 1998 and his sons run the crews on-site most days. When a Wildomar homeowner calls about a garage conversion on Prairie Road, the person who answers knows where Prairie Road is and what the setbacks look like on that side of the 15. That’s not a small thing when you’re about to spend six figures on a project.
Every permit gets pulled and every inspection gets signed on our wildomar jobs. We publish Tom’s name, address, and license number - look it up before you sign anything. Ask anyone on your street about us, or run the number yourself. The permit inspector works for you, not for us, and that’s exactly why we like having him on the job.
Our Wildomar customers deal directly with the Barrett family from first walkthrough to final inspection. A live person answers the phone 24 hours a day, seven days a week. No voicemail box, no out-of-state call center, no “your call is important to us” hold music. You call, we answer.
And the work carries our written 90-Day Done Right Promise. If it’s not done right, Tom comes back and makes it right, one call. That promise is written on every contract, not buried in fine print.
Our Home Additions & ADU Services in Wildomar
Our Home Additions & ADU team handles the full scope of what Wildomar homeowners actually need, from permit-ready ADU plans to finished second-story additions. Here’s what we do most in the 92595.
ADU Design & Permitting
Wildomar sits inside a CAL FIRE Very High Fire Hazard Severity Zone, which means an ADU you saw approved in San Diego or Orange County might not pass Wildomar’s Chapter 7A requirements without ember-resistant venting and fire-rated assemblies. We design to that standard from day one, not as a change order later. The city incorporated in 2008, so the planning department is young, and the rules have shifted more than once. We keep current on Wildomar’s ADU ordinances and we pull every permit ourselves - allowances in writing, scope in writing, change orders in writing.
Garage Conversion ADU
A garage conversion in Wildomar typically runs $30,000-$80,000 depending on what the existing garage is built like. Many homes in the 2000s subdivisions off Clinton Keith Road were framed as attached garages with post-tension slab floors. That slab is the first thing we inspect, because a cracked garage slab is usually a hint of what the rest of your foundation is doing. The good news: a garage conversion often avoids the full foundation cost of a detached build, which is why so many Wildomar homeowners start there.
New Detached ADU
A new detached ADU in Wildomar runs $90,000-$220,000. That’s a wide range because your lot makes the call. A flat pad near the school off Grand Avenue goes a lot faster than a sloped parcel up by the hillsides, where grading and retaining walls become their own line item before the first wall goes up. We don’t bid fuzzy. You get a written, line-item quote before work starts, and every change comes as a written change order before a nail moves.
Junior ADU & Interior Conversion
A junior ADU or interior conversion is the quiet workhorse of Wildomar’s ADU market: a spare bedroom with a private entrance and a kitchenette converted into a rentable or multi-generational unit. These projects often slip in under the $45,000 mark on the low end, but a Wildomar interior conversion still needs the same Chapter 7A fire-rating on wall assemblies and windows. We handle that as part of the plan, not as an “oh by the way” at inspection time.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Room Additions and Second Stories Built for Wildomar’s Lots
A room addition in Wildomar generally lands between $45,000 and $130,000. A second story addition pushes toward the top of that range, and on a post-tension slab, it often means a structural engineer signs off before we frame anything. Wildomar’s 1990s and 2000s tract builds were engineered to a minimum standard, and the Elsinore Trough clay beneath them doesn’t stay still. If you’re adding a bedroom over a garage that’s already showing hairline cracks in the stucco, we want an engineer on that before we pour or frame. That call happens constantly in Wildomar and almost never ten miles south in Murrieta’s older, better-graded lots.
Trusted Brands We Service in Wildomar
When you add square footage in Wildomar, the windows and doors you choose have to meet fire-rating standards and survive 105°F summers with Santa Ana wind. We carry Simonton and Ply Gem lines, so you know what you’re getting - materials you can look up, not mystery brands off a van. We quote the brand, the model, and the fire-rating in writing. If you need a window replacement as part of the ADU, our Kitchen Remodeling in Wildomar and Bathroom Remodeling in Wildomar crews can work the interior spaces as well, since most additions touch more than one trade.
Common Home Additions & ADU Problems We See in Wildomar Homes
- Post-tension slab movement on shrink-swell clay. Wildomar’s tract homes were built fast in the 2000s, and the slabs are now showing the strain. We see this on nearly every addition project where the existing footing gets tied to new concrete.
- Chapter 7A fire-rating gaps. A Wildomar addition that skips ember-resistant venting or non-combustible decking will fail inspection. A contractor coming from coastal San Diego won’t know to plan for it. We do.
- Santa Ana wind damage at roof tie-ins. Where a new roofline meets an old one, Wildomar’s periodic wind events find the weak spot within a season or two. We over-engineer ridge and eave connections because we’ve seen what a Santa Ana does to a sloppy tie-in.
- Stucco cracking that hides deeper issues. The 15-to-20-year maintenance threshold is hitting Wildomar’s original tract builds right now. What looks like a cosmetic stucco crack is sometimes slab movement showing through the veneer. We bring the structural engineer in before you spend money on a fix that won’t hold.
Pricing for Home Additions & ADU in Wildomar, CA
A home addition in Wildomar runs $45,000-$130,000. A full ADU construction runs $90,000-$220,000. A garage conversion runs $30,000-$80,000. A junior ADU or interior conversion can start around $45,000 on the low end. What pushes a Wildomar project toward the top of those ranges? Expansive clay soils that require deeper footings or slab repair, hillside grading with retaining walls, and Chapter 7A fire-rated materials that don’t come cheap. What brings it lower? A flat lot, a simple roofline, and a builder who quotes accurately the first time instead of discovering “surprises” at change-order time. Call (877) 610-1318 for a free estimate. We’ll walk the lot, look at the slab, and give you a written, line-item price you can actually compare.
We Also Serve Cities Near Wildomar
Our crews cover Home Additions & ADU in Wildomar and the surrounding communities - Murrieta, Lake Elsinore, Lakeland Village, and Canyon Lake. Ten extra minutes on the freeway doesn’t change our bid, our permits, or our 90-Day Done Right Promise. If you’re a Wildomar resident weighing a bid from a Murrieta contractor, ask them about Chapter 7A. If they blink, call us instead.
Serving Wildomar, CA - Our Local Coverage Area
We’re based in the Wildomar 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 - Home Additions & ADU in Wildomar
A home addition in Wildomar typically costs $45,000-$130,000, and the main variables are your lot’s clay soil, the slope, and whether Chapter 7A fire-rating applies to the new envelope. Call (877) 610-1318 for an exact quote - estimates are free.
Yes. Every eligible ADU and addition project in Wildomar includes permits pulled and inspections signed by us. We plan for Chapter 7A fire-rating and the city’s current ADU ordinance from the first design conversation, not as a change order later.
It only changes if the scope changes, and in that case you get a written change order before any new work begins. We don’t do verbal allowances and we don’t do surprise invoices. An allowance that isn’t on paper is a surprise waiting for a date.
Most Wildomar ADUs take four to eight months from permit to final inspection, depending on grading, soil conditions, and city review times. A garage conversion is usually faster. A detached build on a hillside parcel takes longer. We’ll give you a timeline in writing so you can plan around it.
Yes. Every job includes the written 90-Day Done Right Promise: if it’s not done right, Tom Barrett comes back and makes it right, one call. This isn’t a verbal handshake. It’s on the contract.
If you’re thinking about an addition or ADU in Wildomar, call (877) 610-1318 for a free estimate. Tom or one of his sons will walk the property with you, look at the slab, check the slope, and tell you honestly what it’ll take. No pressure, no mystery, no change-order games. Just a written price and a contractor whose name is on the truck.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving Wildomar since 1998.