A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in Santa Clarita, CA
Adding an ADU in Santa Clarita usually costs between $180,000 and $420,000 for a detached unit, and the process runs 9 to 18 months from first drawings to final inspection. That is the honest range we quote before we ever walk your lot. Santa Clarita is not a typical Los Angeles build site. Homes here sit on generous lots in master-planned communities like Valencia, Saugus, and Canyon Country, which means many lots actually have room for a detached unit without fighting the tight setbacks you see in older LA neighborhoods. Call (661) 219-7906 and we will give you a written price, not a shrug.
Why Santa Clarita Homes Are Different
Most Santa Clarita homes were built between the 1980s and the mid-2000s by master developers. The typical house is stucco with a tile roof on a lot that is larger than what you would find in the San Fernando Valley. That matters for an ADU in two ways. First, the larger lot means a detached unit is actually feasible in many backyards. Second, many of these communities have HOAs, and HOAs come with their own set of design expectations.
The climate changes the work too. Summer temperatures in the Santa Clarita Valley regularly push past 100°F, so any ADU here needs high-efficiency HVAC and smart window placement. You are not building a shed. You are building a small home that has to hold up to triple-digit heat in July and occasional frost in January. Then there are the Santa Ana winds. They do not make construction impossible, but they do affect scheduling, especially for panel drops and roof work on prefab units.
One more Santa Clarita-specific reality: Valencia’s paseo neighborhoods were originally platted with tight aesthetic rules. Many HOAs tried to ban detached structures outright. State ADU law now overrides those bans, but the HOAs still get a say in how the unit looks. We have built ADUs in Valencia and Canyon Country where the HOA required the unit to match the main home’s stucco color, roofline, and even window style. That is a design constraint most LA contractors never deal with. It is a normal Tuesday for us.
Our Main Santa Clarita Services
Most Santa Clarita homeowners call us for one of three things: a detached ADU in the backyard, a home addition that extends the existing footprint, or a room addition that converts or builds out a specific space. Each has its own page with local pricing and details.
ADU Builders in Santa Clarita
Detached ADUs are the most common project we take on in Santa Clarita. Large lots in Valencia and Canyon Country give us room to work, but the site conditions still matter: drainage, soil compaction, and HOA design review all affect the plan. We build with prefab systems from brands you can research yourself, which cuts construction time compared to pure site-built work. The pre-approved ADU plan program in Santa Clarita can also shorten the permit path, though every lot still gets its own review. ADU Builders in Santa Clarita
Home Addition Contractor in Santa Clarita
A home addition in Santa Clarita means extending the footprint of an existing house. These projects are popular with homeowners who love their neighborhood and their lot, but need a second living area or a larger kitchen. The 1980s-to-2000s housing stock here is structurally predictable, which helps with foundation work, but the extreme summer heat means the new space needs to be insulated and cooled properly from day one. We price the whole job before work starts so there is no surprise at the framing stage. Home Addition Contractor in Santa Clarita
Room Addition Contractor in Santa Clarita
Room additions are the smaller cousin of the full home addition: a single bedroom, an office, a garage conversion into living space. In Santa Clarita, garage conversions are a common request because many 1990s homes here have oversized garages that never get used for cars. One thing to know: if your HOA requires covered parking, a garage conversion may need to be offset with a carport or driveway change. We walk you through that before you spend a dollar on plans. Room Addition Contractor in Santa Clarita
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 Santa Clarita
We are authorized to build with prefab systems from Dvele, Mighty Buildings, and Plant Prefab. These are not generic kits. Each brand has its own engineering, panel system, and finish level, and we help you choose the one that matches your lot, your budget, and your HOA’s design rules. See our brands for the full breakdown.
Pricing for ADU Company in Santa Clarita, CA
Here are the ballpark numbers we quote for Santa Clarita projects. These ranges are based on recent builds in this market, not a national average.
| Service | Typical range in Santa Clarita |
|---|---|
| Detached ADU, 500 sq ft, prefab panel system | $180,000 – $260,000 |
| Detached ADU, 800 sq ft, site-built | $280,000 – $380,000 |
| Attached ADU (garage conversion), 400 sq ft | $120,000 – $190,000 |
| JADU (junior ADU, within existing home) | $70,000 – $120,000 |
| Home addition, 400 sq ft, one bedroom + bath | $160,000 – $240,000 |
| Home addition, 600 sq ft, two rooms | $220,000 – $330,000 |
| Room addition, 200 sq ft, single room | $80,000 – $140,000 |
| Room addition, 300 sq ft, office or studio | $110,000 – $190,000 |
| Prefab upgrade (higher-spec brand, e.g. Dvele) | Add $40,000 – $90,000 to base |
| HOA-required exterior match (stucco, roofline) | Add $8,000 – $25,000 |
What pushes a Santa Clarita price up is usually three things: HOA design review demanding custom exterior finishes, extra HVAC capacity for the 100°F summers, and soil or drainage work on lots that have not been touched since the Reagan administration. That is why we put the price in writing before any work starts. If the number changes on us, you do not pay the difference.
Neighborhoods We Serve in Santa Clarita
We work across the entire Santa Clarita Valley, from Valencia to Saugus to Newhall. Most of our ADU and addition projects are built on lots in master-planned communities, but we also take on work in the older pockets where lot sizes and setback rules vary more.
- Valencia
- Saugus
- Canyon Country
- Newhall
- Stevenson Ranch
We schedule locally and keep our response time within the Santa Clarita Valley under 48 hours for estimates. A live person answers the phone, not a voicemail tree.
Service Area – Cities Near Santa Clarita
While this page focuses on Santa Clarita, our crews also take on ADU and addition work in the surrounding communities. We serve Stevenson Ranch, CA, Castaic, CA, Sylmar, CA, and San Fernando, CA. If you are near the Santa Clarita Valley and not sure whether we cover your street, call us and ask.
Serving Santa Clarita, CA - Our Local Coverage Area
We’re based in the Santa Clarita 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 Santa Clarita
State law overrides HOA bans on ADUs, but your HOA can still impose design standards: color, roofline, window style, and setbacks within your own lot. You cannot skip HOA review entirely. We handle the design submittal and revisions as part of the job, so the HOA conversation does not land on your shoulders.
Plan 9 to 18 months from first design meeting to final inspection. Permitting speed varies by project type and whether your lot falls under the city’s pre-approved ADU plan program. Prefab panel systems can cut on-site construction time, but HOA review and utility connection timelines still apply. Call (661) 219-7906 to get a schedule estimate for your specific lot.
Yes. Every ADU, home addition, and room addition we build in Santa Clarita is fully permitted, inspected, and closed out with the city. We do not do unpermitted work, and we do not suggest you do either. Unpermitted additions become a problem when you sell the house, and they can cost more to correct later than they saved at the start.
If you are thinking about an ADU or addition in Santa Clarita, call (661) 219-7906 and we will give you a written price before any work starts. Free estimate, no pressure, and the number you get is the number you pay.
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 Santa Clarita Customers Say
"Fixed quote and clear change orders approved by text."
- Trina M."Photos of each milestone, which I loved. Slab, framing, roof dry-in, each one came with a few pictures by text."
- Gwen D."Room addition off the kitchen. Framing, drywall, and paint all done well."
- Wade L.
