Kitchen remodeling
Bathroom remodeling
Home additions & ADU
Roofing
Windows & doors
Driveway & pavers
FenceFree written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
Fast, Reliable General Contractor Across San Antonio Heights
Hiring a general contractor in San Antonio Heights means finding someone who understands hillside foundations, LA County permitting, and fire-hardened exterior requirements before the first shovel hits dirt. That’s the work we do every day at Garden Grove Contractors. We manage kitchens, baths, additions, roofing, hardscape, and ADUs from the first plan check to the final inspection, all under one contract and one accountable team led by Noel Cardenas. If you’re planning a remodel or addition on a sloped lot off Mountain Avenue or along the upper foothill streets, call (877) 373-9230 for a free estimate and we’ll walk the property with you.
Key takeaways:
- San Antonio Heights projects pull permits through LA County Building and Safety, not a city counter, which changes inspection sequencing and plan-check timing.
- Home additions here run $45,000 – $130,000; ADU construction runs $90,000 – $220,000 depending on grade, foundation work, and fire-rating requirements.
- Hillside lots above the neighborhood regularly need piers and caissons instead of shallow footings, and drainage design matters as much as the structure itself.
Why Garden Grove Contractors Is San Antonio Heights’s Preferred General Contractor Company
We’ve worked the terraced lots and mid-century ranch homes that define this foothill enclave, and the difference between a smooth project and a stalled one here usually comes down to how well the contractor sequences LA County inspections with hillside grading. Our San Antonio Heights clients tell us the same thing: the plan-check process through LA County Building and Safety moves differently than Upland or Claremont, and a general contractor who doesn’t know that burns weeks. We do know it, because we’ve pulled permits for additions, retaining walls, and ADUs throughout the 91784 ZIP code.
One contractor, one contract. That’s the practical difference when your project spans interior framing, exterior fire-rated cladding, roof tie-downs, and drainage. Noel Cardenas and our team keep the load path, the waterproofing details, and the inspection log moving together so you’re never waiting on a trade that doesn’t communicate. We spec the right material for your lot, not the easiest one to install.
Styles & brands we work with
- Kitchen remodeling
- Bathroom remodeling
- Home additions & ADU
- Roofing
- Windows & doors
- Driveway & pavers
- Fence
Licensed General Contractor in San Antonio Heights
A licensed general contractor in San Antonio Heights is the single party responsible for pulling LA County permits, coordinating engineered plans, managing subcontractors, and passing every inspection from rough framing to final. In this area, that job carries weight: sloped lots force foundation decisions early, WUI fire requirements shape exterior material choices, and winter runoff means grading and drainage have to be solved before structure gets framed. When we take on a San Antonio Heights project, we’re accountable for all of it, including the documentation trail an insurer may ask for later.
Typical scopes and San Antonio Heights pricing for general contracting work:. A home addition in San Antonio Heights runs $45,000 – $130,000. Garage conversions fall between $30,000 and $80,000. ADU construction starts around $90,000 and can reach $220,000 on difficult hillside lots with pier-and-caisson foundations.
Permits, Drawings, and Inspections
We handle the full permit package for LA County Building and Safety, including engineered drawings for foundation work when grade demands piers or caissons. That means your addition or ADU gets sequenced so retaining-wall drainage review, rough-in inspection, and structural sign-off all line up without rework. If your upper-street lot needs a retaining wall before the addition can go in, we build that into the schedule and the contract up front.
One Contract, Every Trade
From foundation through framing, roofing, windows, and finish surfaces, we manage the subcontractors and the schedule. You get a written line-item quote, fixed pricing, and no surprise change orders because the hillside scope was ignored at bid time. We also pull all permits and stand behind the workmanship with a warranty.
Residential General Contractor in San Antonio Heights
A residential general contractor in San Antonio Heights has to think beyond the four walls: fire-hardened exterior assemblies, wind-rated roof tie-downs, slope-stabilized foundations, and stormwater control are all part of building or remodeling a house here. We’ve rebuilt raised-foundation additions on terraced lots where the structural design called for caissons, not footings, and we’ve replaced roofs on WUI-adjacent homes where the shingle class and underlayment spec had to meet specific California Building Code wildfire chapters.
That context changes what a real quote includes. It includes the engineered foundation scope, the drainage plan, and the product submittals for fire-rated and wind-rated assemblies. A cheap bid that skips those items isn’t cheaper; it just hasn’t priced the job yet.
Additions and ADUs on Sloped Lots
On hillside properties along the upper streets of San Antonio Heights, additions and ADUs frequently require piers and caissons rather than shallow footings. We coordinate the soils report, the structural engineering, and the LA County inspection sign-off on the foundation before any wood goes up. That foundation work is part of our fixed quote, not a change order discovered after permit issue.
Exterior Upgrades and Fire Hardening
Roof replacement, impact windows, and deck construction in the foothill zone need to meet wind and fire ratings that flatland homes simply don’t face. We source GAF and CertainTeed roofing systems, PGT impact windows, and fire-rated decking through our manufacturer partnerships so the assemblies you pay for are documented and compliant.
Trusted Brands We Service in San Antonio Heights
Our San Antonio Heights customers don’t get one supplier’s leftover inventory. We source from a curated list of 50+ manufacturers, including Therma-Tru for entry doors, ViewLux for window solutions, Barrette for fencing, and Master Halco for fencing and perimeter structures. When a project calls for fire-rated exterior materials or wind-rated roof assemblies, we specify from brands with the testing documentation LA County wants to see.
See the difference
Before
After
Before
After
Before
AfterCommon General Contractor Problems We See in San Antonio Heights Homes
- Sloped-lot foundations bid as flat-lot slabs. Contractors unfamiliar with the foothills quote shallow footings, then hit grade conditions that require piers and caissons mid-permit. The change order lands on the homeowner, and the schedule slips weeks.
- Missing wind and fire documentation. A roof or deck gets replaced without product submittals or inspection sign-off on the rated assembly. When a Santa Ana wind or wildfire claim comes up, the insurer asks for documentation the homeowner doesn’t have.
- LA County permitting mis-sequenced. A contractor treats the plan check like a city counter, orders materials early, and then watches the project stall because retaining-wall drainage or engineered foundation review isn’t cleared before rough-in.
- Storm runoff ignored until the rainy season. Terraced lots shed water fast in winter storms. If drainage and retaining walls aren’t sequenced correctly, the grading work gets undercut and the structure faces erosion before final inspection.
Pricing for General Contractor in San Antonio Heights, CA
Here’s what general contracting work in San Antonio Heights actually costs, based on the scopes we bid most often in the 91784 area.
| Project | Typical San Antonio Heights Range |
|---|---|
| Home Addition | $45,000 – $130,000 |
| ADU Construction | $90,000 – $220,000 |
| Garage Conversion | $30,000 – $80,000 |
| Roof Replacement | $8,000 – $20,000 |
Hillside foundation work, retaining walls, drainage, and fire-rated assemblies all affect the final price. A home addition on a flat mid-century lot will land at the lower end. The same addition on a terraced upper-street lot will run higher because piers and caissons cost more than shallow footings, and they should: they’re what keep the structure sound. We give free estimates and written, line-item quotes. Call (877) 373-9230 and we’ll price your actual lot, not a generic one.
We Also Serve Cities Near San Antonio Heights
Our General Contractor team works throughout the foothill and valley communities around San Antonio Heights, including Upland, Claremont, Rancho Cucamonga, and Montclair. If your project sits in one of those cities, the permitting path changes, but our full-scope approach and brand partnerships stay the same. Learn more about our San Antonio Heights coverage or call (877) 373-9230.
Serving San Antonio Heights, CA - Our Local Coverage Area
We serve San Antonio Heights and nearby communities. Use the map below to see the area we cover. If you’re nearby, we can almost certainly help.
FAQs About General Contractor in San Antonio Heights
LA County Building and Safety issues all building permits in San Antonio Heights, because the community is unincorporated LA County, not a city like Upland or Claremont. That means plan-check turnaround, inspection scheduling, and the paperwork trail all run through the county system, and the sequencing differs from city-run departments. We handle the full permit package and the county inspections on every project. Call (877) 373-9230 if you want to know how LA County permitting will affect your timeline.
In San Antonio Heights, roof and deck replacements in the wildland-urban interface zone have to meet California Building Code Chapter 7A fire-resistant construction standards and local wind requirements tied to foothill elevation. That typically means a Class A roof assembly with specific underlayment and edge details, ember-resistant vents, and fire-rated decking or ignition-resistant materials. We include the product submittals and inspection sign-off for those assemblies in our quotes, so you have documentation if an insurer asks after a Santa Ana event. Call (877) 373-9230 to have your existing roof or deck assessed against current WUI requirements.
Hillside lots slope enough that shallow footings can’t transfer the building load safely into stable soil, so engineers specify piers and caissons that extend down to competent bearing material. On the terraced upper streets, that’s routine for additions, ADUs, and even some garage conversions. We coordinate the soils report, the engineered foundation plan, and the LA County inspection sign-off on the caissons before framing starts. A free estimate from us includes an honest read on whether your lot will need that foundation scope.
Yes. If you file a wind or wildfire claim, your insurer will ask for the inspection sign-offs and product submittals that prove the addition or deck was built to the rated assembly specified for San Antonio Heights. Without that paper trail, a claim can be reduced or denied. We keep the documentation trail intact: permit records, LA County inspection approvals, engineered foundation sign-offs, and fire-rated product submittals. That file is yours to keep.
We sequence retaining walls and drainage before structural rough-in, because runoff down the slope will undercut new work if it isn’t controlled first. On a terraced lot we rebuilt above the neighborhood, the retaining wall and winter-runoff drainage went in before the caissons and framing. We also write the drainage scope into the original contract so it isn’t a change order after the first heavy storm. Call (877) 373-9230 and we’ll walk your lot to see what the water does before we quote the structure.
Garden Grove Contractors serves San Antonio Heights with full-scope general contracting, from foundation to roofline. Need a written quote on an addition, ADU, roof replacement, or full home remodel? Call (877) 373-9230 to schedule your free estimate. Noel Cardenas will review your lot, your plans, and your budget with you directly.
Written by Noel Cardenas, Owner at Garden Grove Contractors, serving San Antonio Heights and the surrounding foothill communities.