A free site visit, a check of what your lot allows and a written, line-item price.
Get your free estimateADU Company in El Granada, CA
El Granada sits inside the California Coastal Zone, which means an ADU project here answers to San Mateo County planners first and the Coastal Commission second. Most homes in town were built between the 1960s and 1980s as single-family houses, often on septic and often on lots that don’t fully meet today’s setback rules. That shifts which ADU designs actually get approved, and our job is spotting the route that works before you spend money on drawings. Call (424) 328-5746 if you want a straight read on whether your lot can carry an ADU, an attached addition, or a garage conversion.
Why El Granada Homes Are Different
Fog is the quiet variable on every El Granada job. The marine layer pushes moisture into framing, siding, and window flashing in a way you don’t see ten miles inland, so we spec corrosion-resistant fasteners and moisture barriers as standard on any ADU or addition. And because most homes north of Highway 1 are on septic rather than sewer, adding a bathroom or a second dwelling often triggers a septic system review as part of the permit package. That review can add weeks to the front end, which is exactly why we put the plan and the price in writing before any work starts.
The lots themselves add another layer. Historic subdivision patterns in El Granada left many parcels with non-conforming setbacks, meaning the building envelope is smaller than today’s county code assumes. A detached ADU that fits a normal lot in Half Moon Bay might squeeze an El Granada lot down to nothing. Attached ADUs and garage conversions usually suit these parcels better, and we can tell you which path looks viable from the first site visit.
Our Main El Granada Services
Most El Granada homeowners call us about two things: building a new ADU, and stretching the main house with an addition. Here’s how each plays out on the coastside.
ADU Builders in El Granada
An El Granada ADU usually means either a garage conversion or a small attached unit, because detached footprints often collide with coastal setback limits and septic constraints. You’re also working with county-level coastal development permits, and we handle that paperwork as part of the job. We build with prefab systems from brands like Abodu and Cover when the lot can take them, and we carry the full plan set through design review. ADU Builders in El Granada covers pricing, timelines, and the permit path in depth.
Home Addition Contractor in El Granada
A home addition on the coastside means matching an older house to modern moisture management without ripping the original structure apart. Many El Granada homes were built before current energy and shear codes, so additions often bring the existing wall sections up to code along the way. Coastal fog drives our flashing and vapor barrier choices. If you’re adding a bedroom, office, or extended kitchen, Home Addition Contractor in El Granada walks through the full scope and cost breakdown.
Room Addition Contractor in El Granada
A single room addition, whether it’s a home office above the garage or a ground-floor bedroom for an aging parent, still has to clear the same coastal design review as a larger project. That’s the reality in an unincorporated coastal town. We keep the scope tight so the permit package stays as simple as possible while meeting county requirements. Room Addition Contractor in El Granada explains typical timelines for smaller add-ons and what they cost on the coast.
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 El Granada
We build with and service a focused set of prefab and materials brands, including Tuff Shed, James Hardie, Abodu, and Cover. Hardie plank and panel holds up better than most sidings in constant marine-layer exposure, which is why we recommend it often here. For details on everything we offer, see our brands.
Pricing for ADU Company in El Granada, CA
| Service | Typical range in El Granada |
|---|---|
| ADU – garage conversion | $120,000 – $180,000 |
| ADU – attached unit (up to 500 sq ft) | $150,000 – $220,000 |
| ADU – detached unit (up to 750 sq ft) | $200,000 – $320,000 |
| ADU – 2 bedroom detached | $260,000 – $380,000 |
| Home addition – first floor extension | $180 – $300 per sq ft |
| Home addition – second story on existing footprint | $220 – $350 per sq ft |
| Room addition – single room | $60,000 – $110,000 |
| Room addition – office or studio | $45,000 – $90,000 |
| Bathroom addition | $35,000 – $70,000 |
| Kitchen extension | $50,000 – $100,000 |
| Garage conversion to living space | $90,000 – $150,000 |
| Full project management | 5 – 10% of total budget |
Coastal development permits and septic reviews push El Granada prices toward the higher end of these ranges, especially when the lot has non-conforming setbacks that require a variance. That’s not a reason to guess. Every project gets a written price before any work starts, so the number you approve is the number you pay.
Neighborhoods We Serve in El Granada
We work across the whole El Granada area, from the flat pockets near Princeton Harbor up the hillside streets above Coronado. Coastal fog is heaviest near the harbor, which changes moisture management on lower lots. Hill homes get more afternoon sun but steeper access for materials delivery.
- Princeton Harbor area
- Coronado neighborhood
- Avenue Alhambra corridor
- El Granada hillside streets
- Near El Granada Elementary
For most El Granada projects, we schedule the first site visit within a few business days of your call, and we’ll confirm the exact arrival time in advance.
Service Area – Cities Near El Granada
Beyond El Granada, our crews cover the mid-Peninsula coast and bay side. You’ll find us across Half Moon Bay, CA, up the 92 through Burlingame, CA, north into San Francisco, CA, and east across the San Mateo Bridge to Castro Valley, CA. Scheduling is coordinated from our San Francisco Bay Area office, and crews dispatch locally to El Granada.
Serving El Granada, CA - Our Local Coverage Area
We’re based in the El Granada 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 El Granada
Yes, in most cases. El Granada sits within the California Coastal Zone, so nearly any ADU or significant addition triggers a coastal development permit through San Mateo County. We prepare the application and design review package as part of our scope. Call (424) 328-5746 to find out whether your specific lot falls inside the coastal boundary.
It means we treat moisture management as a structural issue, not an afterthought. We spec corrosion-resistant fasteners, vapor barriers behind siding, and exterior cladding like James Hardie that holds up under constant marine-layer exposure. The fog also shortens ideal exterior finishing windows, which we build into the schedule upfront.
Quite often, yes. Many El Granada homes are on septic rather than sewer, and adding a bathroom or a full second dwelling triggers a septic system evaluation as part of the permit. If the system can’t support the added load, it can change the unit size or force a system upgrade. We flag this early so you’re never surprised mid-project. Call (424) 328-5746 for a free estimate and a straight answer on your lot.
Benson ADU Builders is led by Troy Eastman and part of the Relay Home Co. family, founded in 2006. Every project carries The Relay Visibility Guarantee: a written price before work starts, a 365-Day Done Right Promise, and a written guarantee on the work. Ready to talk about your El Granada project? Call (424) 328-5746 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 El Granada Customers Say
"Plumbing and electrical passed on the first inspection."
- Alan B."Communication was the best part. I always knew what was happening that week without having to ask."
- Dolly N."Room addition off the kitchen. Framing, drywall, and paint all done well."
- Wade L.
