Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
Before
After
Before
After
Before
AfterFast, Reliable Home Additions & ADU Across San Clemente
A home addition or ADU in San Clemente typically costs $45,000-$130,000 for a room addition and $90,000-$220,000 for a full ADU build, and the single biggest variable here is something most cities don’t have: mandatory Spanish Colonial Revival design review on every exterior alteration. That changes what materials you can use, what your roofline has to look like, and how long the permit takes. Barrett & Sons Construction has been building and remodeling homes since 1998, and we know exactly what the San Clemente review board will approve before you spend a dollar on drawings. Call (877) 610-1318 for a free estimate and we’ll walk you through the whole process, step by step.
Why Barrett & Sons Construction Is San Clemente’s Preferred Home Additions & ADU Company
Tom Barrett founded this company in 1998 and his sons run the crews. When you call about a San Clemente addition, you’re talking to someone who will show up at your house, not a call center. Our Home Additions & ADU team has worked through San Clemente’s design review process enough times to know which tile profiles, stucco finishes, and window styles pass on the first submittal. That matters here more than almost anywhere in Orange County, because a rejection from design review adds weeks and usually means paying an architect to redraw something that should have been right the first time.
We’re not the cheapest bid in San Clemente and we won’t pretend to be. But every scope, every allowance, and every price change arrives as a written change order before work proceeds. Tom Barrett publishes his name, his address, and his license number, and a live person answers the phone 24/7. If you’re in the 92672 beach core, Talega, or the canyon neighborhoods, we’ve likely already done work on your street or within a few blocks of it.
Our Home Additions & ADU Services in San Clemente
ADU Design & Permitting
Before you build an ADU in San Clemente, the submittal packet has to be complete: architectural drawings, a geotech report if you’re near the bluffs or canyons, a color-and-materials board matching the Spanish Colonial palette, and the design review application itself. We file all of it. We also schedule the work around the review calendar so your project doesn’t sit half-finished waiting on a committee. Most homeowners trying to do this themselves learn the hard way that a missing geotech report or the wrong window mullion detail kicks the application back and burns six weeks. We don’t let that happen.
Garage Conversion ADU
A garage conversion in San Clemente runs $30,000-$80,000 and is usually the fastest ADU path, but the exterior still has to match. In the 92672 beach core, that often means re-facing the old garage door opening with a stucco wall and an arched entry or window, not just slapping siding over it. In Talega (92673), the HOA architectural committee adds a second approval on top of the city’s design review, so we file both at the same time to keep the schedule from stretching out.
New Detached ADU
A detached ADU in San Clemente gives you a separate roofline and more design freedom within the Spanish Colonial rules. Plan on clay tile or a city-approved alternative, white or light-toned stucco, and windows with divided lites. If you’re on an oceanside bluff lot, the city will require slope-stabilization work that inland OC cities almost never ask for. We’ve done enough of these to price it honestly up front instead of discovering it halfway through the foundation.
Junior ADU & Interior Conversion
A Junior ADU inside your existing San Clemente home is the least expensive way to add a rentable or family unit, and it usually avoids exterior design review entirely if you’re not changing the outside. That makes it a good option for the 1920s-1950s homes in the beach core where adding square footage outward gets complicated fast. We’ll tell you honestly whether a JADU, a garage conversion, or a full addition makes the most sense for your lot and your budget.
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.
Trusted Brands We Service in San Clemente
We carry and install materials you can look up, not mystery brands off a van. On San Clemente additions and ADUs we regularly use Schluter waterproofing systems in kitchens and baths, Grohe fixtures where quality shows, and GAF roofing products where the design review allows non-tile profiles. For the tile roofs that dominate the 92672 beach core, we match existing clay tile profiles so your second story doesn’t look like it landed from another neighborhood. If you want to check a brand before signing, we encourage it.
Common Home Additions & ADU Problems We See in San Clemente Homes
- Design review rejections for the wrong materials. Homeowners file an ADU with fiber-cement siding or a standing-seam metal roof because it’s cheaper, only to have design review reject it for not matching the Spanish Colonial palette. They then pay a change order to re-clad in white stucco and clay tile. We spec it correctly the first time.
- Foundation cracks on canyon and hillside lots. The expansive clays in San Clemente’s canyon areas swell and crack a standard slab after a wet El Niño winter. City inspectors and geotechs here have seen too many conventional foundations heave. We spec post-tension slabs or deepened footings on hillside additions as a baseline, not an upgrade.
- Salt corrosion near the coast. Within about a mile of the ocean, salt-laden marine air accelerates corrosion of fasteners, flashing, and rebar. Cheap galvanized hardware rusts out years early. We use stainless or hot-dipped galvanized hardware on coastal projects, and we treat it as standard practice, not an upsell.
- Talega HOA surprises. In the 92673 zip code, the city issues the permit but the HOA architectural committee has its own rules on window mullions, roof tile color, and even exterior paint tones. That’s a second approval, not an afterthought. We file both in parallel so one doesn’t hold up the other.
Pricing for Home Additions & ADU in San Clemente, CA
We quote real numbers, not vague ranges with a surprise at the end. San Clemente pricing runs higher than Dana Point or San Juan Capistrano for one reason: design review compliance adds specialized labor and material costs that don’t exist in neighboring cities. Here’s what we typically see:
| Project Type | Typical San Clemente Range |
|---|---|
| Home Addition | $45,000-$130,000 |
| ADU Construction | $90,000-$220,000 |
| Garage Conversion ADU | $30,000-$80,000 |
The biggest cost drivers are lot conditions (bluff, canyon, or flat), whether you’re in design review or HOA territory, and the complexity of matching your existing Spanish Colonial exterior. Every price change arrives as a written change order before work proceeds. Call (877) 610-1318 to schedule your free estimate and get exact numbers for your lot.
We Also Serve Cities Near San Clemente
Our crews work throughout south Orange County, and we run the same written-change-order process in every city. If you’re in San Juan Capistrano, Dana Point, Ladera Ranch, or Laguna Niguel, we handle San Clemente-adjacent projects with the same permit-first approach, though the design review rules are generally easier outside San Clemente’s city limits.
Serving San Clemente, CA - Our Local Coverage Area
We’re based in the San Clemente 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 San Clemente
San Clemente requires clay tile or a city-approved alternative that matches the Spanish Colonial Revival palette, and design review will reject modern fiber-cement siding or standing-seam metal. Your best path is to plan for clay tile or a matching tile profile from the start. Call (877) 610-1318 for an exact answer on your lot and submittal.
San Clemente’s design review typically adds 4-8 weeks to the permitting calendar compared to Dana Point, where exterior review is much lighter or absent. We schedule the structural rough-in around the review calendar so you’re not paying crews to stand around waiting on a committee decision.
Yes. The city of San Clemente issues the permit, and the Talega HOA architectural committee enforces its own rules on window styles, roof tile color, and exterior finishes. We file both applications at the same time and sequence the work so neither holds up the schedule. Call (877) 610-1318 to talk through your specific Talega lot.
Most oceanside bluff lots require slope stabilization and a geotech report before the city will even look at your ADU plans, because the bluffs here have documented active erosion and slope instability. This is not optional. We’ve done hillside projects in the 92672 beach core and we’ll tell you honestly what the stabilization work costs before you commit.
Salt-laden marine air within roughly a mile of the ocean corrodes standard fasteners, flashing, and rebar years before their time, so we spec stainless or hot-dipped galvanized hardware as a baseline on coastal San Clemente projects rather than an upgrade. It’s the difference between hardware that lasts 40 years and hardware that starts rusting in eight.
Written by Tom Barrett, Owner at Barrett & Sons Construction, serving San Clemente since 1998.