Danville · Alamo · Blackhawk · Diablo
Patio Covers and Pergolas in Danville
Many Danville lots have room for a large cover beside a pool or an outdoor kitchen, so the questions here are span, footings and HOA sign-off. Addresses inside the Town go through Danville's Permit Center; Alamo, Blackhawk and Diablo are unincorporated and go through Contra Costa County.
Town or County: who reviews your cover
| Address | Permit office | Starting point |
|---|---|---|
| Town of Danville | Danville Permit Center | Ask about patio covers for your zoning district and lot. |
| Alamo, Blackhawk, Diablo (unincorporated) | Contra Costa County | No permit for open trellises and pergolas with no solid roof and 120 sq ft or less of roof area (County guide); setbacks and easements still apply. |
Covers that suit big, sunny yards
- Insulated aluminum by the pool: a cool ceiling with fans and lights for a lounge area. A 20×20 cover (400 sq ft) runs about $7,200–$22,000+ in standard aluminum; insulated panels cost more. Aluminum covers.
- Louvered over the outdoor kitchen: open while you cook, closed when it rains. HomeGuide puts a 20×20 at $18,000–$50,000+. Louvered pergolas.
- Long spans: fewer posts means bigger beams and footings; ask for the engineering up front.
Fire maps
Danville is among the Contra Costa cities whose 2025 local maps include Very High fire hazard areas (Danville San Ramon), mostly toward the hills. If your address is mapped, covers within 3 feet of the house must be noncombustible or ignition-resistant. Fire-zone guide.
- Check “Patio cover”It is listed under backyard projects on the application form.
- Four copies of plansOne on paper no larger than 11×17, or on a thumb drive or CD.
- Fee and depositFees from $50 up to $550 by project; deposits generally around $2,000.
- Build within 90 daysApproval is valid for 90 days from the date on the form.
Questions homeowners ask
Do I need a permit for a patio cover in Danville?
Inside the Town of Danville, ask the Permit Center about your cover's size, roof type and wiring. In unincorporated Alamo, Blackhawk and Diablo, the County exempts trellises, arbors and pergolas with no solid roof and 120 sq ft or less of roof area; larger or solid-roof covers need a permit.
How long does Blackhawk HOA approval last?
Blackhawk's architectural approval is valid for 90 days from the date on the form, so schedule the build before applying.
What does a 20×20 cover cost in Danville?
Using published ranges: about $7,200–$22,000+ in aluminum and $18,000–$50,000+ as a louvered pergola, before electrical, permits and HOA fees. Real quotes can land below or above.
Sources
- Town of Danville — Permit Center
- Contra Costa County — Trellises, Arbors & Pergolas Accessory to a Residence (not exceeding 120 sq ft)
- Contra Costa County — Building or Grading Permit Overview
- Blackhawk HOA — Architectural Review application form (PDF)
- Blackhawk HOA — Architectural Review Application
- Danville San Ramon — Danville among county's 12 cities with Very High fire hazard areas (March 2025)
- CAL FIRE Office of the State Fire Marshal — Fire Hazard Severity Zones
- HomeGuide — How much does a louvered or motorized pergola cost? (February 2026)
- Pacific Pavers — Aluminum patio cover cost per square foot (Orange County, February 2026)
Checked October 2026. Rules and prices change; confirm with the agency or installer before you rely on them.
Ready to price your patio cover?
Tell us the size and the type you are leaning toward. A local installer can measure, quote and handle permits.