Do I need a permit for a small shed or storage structure?

Sheds under 120 square feet and not exceeding 15 feet in height with no electric or plumbing are often permit-exempt in California, but Mountain View may require a minor permit to verify setbacks and lot coverage. Check with the Building Department before you build. If the shed is under 200 square feet and complies with setbacks, you can often get a permit over-the-counter for $100–$200.

How long does a typical residential permit take in Mountain View?

Over-the-counter permits (fences, sheds, solar, roof replacement) can be issued the same day or within 1-2 business days if your application is complete. Design-review permits (additions, ADUs, major remodels) typically take 3-6 weeks for initial plan review, then 1-2 weeks for revisions, then 1-2 weeks for final sign-off. Peak season (April–September) can stretch this to 8-10 weeks. Always ask the Building Department for their current average when you start.

What's included in the permit cost?

Mountain View's permit fee is typically a percentage of the project's construction value (often 1.5-2% for design-review permits) plus a flat base fee ($75–$150). Over-the-counter permits are usually flat fees ($100–$250). Inspection fees are bundled into the permit; there's no extra charge when the inspector comes out. Some complex projects (ADUs, additions requiring geotechnical reports) may incur plan-check fees on top of the base permit fee. Always ask for the fee breakdown in writing before you file.

Can I do my own electrical or plumbing work?

California law allows owner-builders to do electrical and plumbing work on their primary residence, but the work must be inspected and signed off by a state-licensed electrical or plumbing inspector—not a city building inspector. Mountain View enforces this strictly. If you're not licensed and don't hire a licensed contractor, you won't get a final sign-off and you may have trouble selling or refinancing the property. The cost of a licensed contractor is almost always less than the cost of rework and failed inspections.

Do I need seismic retrofitting if I'm doing a major remodel?

California (and Mountain View) trigger mandatory seismic evaluation if you're doing work that's 25% or more of the market value of the structure, or if you're replacing the roof, or if you're adding a new story. If triggered, you must either retrofit to current seismic standards or file a seismic mitigation plan. This can add $10,000–$50,000+ to the project depending on the house age and condition. Ask early in the design phase whether your project triggers the threshold—the Building Department can tell you in a 10-minute call.

What's the deal with EV charging in new construction or major remodels?

California Title 24 (and Mountain View local code) require either EV charging installation or the rough-in (conduit and electrical supply) in new construction and major remodels. 'Major remodel' typically means 25%+ of market value. If you're not installing a charger, you must rough in the infrastructure so one can be added later. This adds maybe $1,000–$3,000 to the cost but it's mandatory and the Building Department will catch it at plan review if you don't show it on the electrical plan.

What happens if I build without a permit?

Mountain View Building Department does receive complaints about unpermitted work, and they investigate. If caught before completion, you'll be ordered to stop work, hire a licensed contractor to bring it up to code, and pull a permit for the completed work (which costs more than doing it right the first time). If caught after completion, you may face fines, citations, and difficulty selling or insuring the property. Some unpermitted work (especially electrical) can be a safety hazard and a liability. The permit cost is almost always cheaper than the risk.

How do I know if my lot is non-conforming for setbacks?

Pull your lot's zoning information from the City of Mountain View's online zoning map (accessible through the city website). This shows your zoning district, required setbacks, and lot-coverage limits. If your existing house doesn't meet current setback requirements, it's non-conforming. You can keep it as-is, but you can't expand into the non-conforming area without a variance or conditional use permit—a 3-4 month public process. Check this before you design an addition.

Do I need a demolition permit?

Demolition of any structure over 500 square feet requires a demolition permit and usually triggers a construction-impact assessment (traffic control, dust control, neighborhood notification). A 15-minute demolition conversation with the Building Department will tell you whether your project needs it and what it costs ($200–$500 typically). Asbestos and lead-paint surveys are also typically required on pre-1980s homes and must happen before demolition begins.

Building Permits in Mountain View, CA (2026)

Do I need a permit in Mountain View, CA?

Mountain View sits at the heart of Silicon Valley, where the majority of residential construction is infill and renovation rather than ground-up builds. The City of Mountain View Building Department enforces the 2022 California Building Code with local amendments focused on water conservation, accessibility, and seismic resilience. Because Mountain View is in a high-cost urban market with tight lots and older housing stock, permit scrutiny is typically high—especially for electrical and plumbing work, lot-line setbacks, and anything touching the street or affecting neighbors. The good news: Mountain View offers over-the-counter permitting for routine projects like fences, sheds, and some repairs. The harder news: plan review for ADUs, major remodels, and additions routinely runs 4-6 weeks, and inspection turnarounds can be slow during peak season (March through October). Most homeowners underestimate both the time and the cost. A small addition that looks straightforward on paper often requires a geotechnical report, a traffic study for demolition, or a phase-I environmental assessment depending on lot history. Starting with a 15-minute call to the Building Department before you commit to design saves thousands in rework.

What's specific to Mountain View permits

Mountain View adopted the 2022 California Building Code, which is more aggressive than the 2021 IBC on seismic requirements, energy efficiency, and EV charging. Any new construction or major remodel must include EV charging infrastructure or the rough-in conduit (Title 24 Part 6 compliance). This isn't optional and it's often overlooked in permit applications—expect plan review bounces if you don't show it. Also, water conservation requirements run stricter than state minimum: new toilets must be 1.28 GPF, shower heads 1.5 GPM, and outdoor irrigation must be drought-resistant. These seem like small details but they show up on the plan-review checklist and can delay sign-off.

Setback and lot-line rules are tighter than they look on paper. Mountain View enforces strict front-setback, side-yard, and rear-yard minimums that vary by zoning district. Many lots in the downtown and midtown areas are non-conforming, which means you can't expand into a non-compliant setback without a variance—a process that takes 3-4 months and includes public notice. Before you design an addition, pull your lot's zoning data from the City's online zoning map. A 10-minute investment there saves weeks of design rework.

Mountain View requires a construction-impact assessment for most residential demolition and new construction. This includes traffic-control plans, dust-control plans, and sometimes a neighborhood-notification packet. It's not a separate permit but it's part of the project permit and it delays plan review if you don't front-load it. Contractors know this; homeowners usually don't. If you're hiring a general contractor, they should be building this into their timeline and their cost estimate.

Electrical and plumbing work are heavily scrutinized. California law (B&P Code § 7044) allows owner-builders to do their own electrical work, but only for projects where they're the owner-occupant and it's on their primary residence. The work must pass inspection by a state-licensed electrical inspector—many homeowners do the work themselves and then can't get it signed off because the inspector sees obvious code violations. Plumbing has the same rule. If you're not licensed and your spouse isn't, hire a licensed contractor. The inspection cost is negligible compared to rework.

Mountain View's online portal (accessible through the city website) offers over-the-counter permitting for fences, sheds, solar installations, and roof replacements. You can often walk out the same day with a permit if your application is clean. For anything more complex—decks, ADUs, additions, mechanical upgrades—expect to file and wait for plan review. The average wait is 3-4 weeks, but during fire-season building bans or when the city is staffing gaps, it can stretch to 8-10 weeks.

Most common Mountain View permit projects

Silicon Valley's infill focus means most residential permits fall into renovation, accessory housing, and seismic upgrades rather than ground-up builds. Here are the projects that show up most often in Mountain View's permit queue.

Decks

Decks under 200 square feet and not exceeding 30 inches in height are sometimes over-the-counter; larger decks and anything attached to the house requires a full permit. Frost depth is not a concern on the coast, but setback and fire-clearance rules are strict.

Fences

Most residential fences under 6 feet in rear or side yards are over-the-counter permits ($150–$250). Front-yard fences, masonry walls, and pool barriers require full plan review and cost $250–$500.

Roof replacement

Roof replacement over existing structure is over-the-counter in most cases; expect a $100–$300 permit and next-day inspection. If you're upgrading to cool roofing or solar-reflectant material, you may need energy-code verification.

Electrical work

New circuits, sub-panels, EV charging installation, and any permanent load addition require a subpermit filed by a licensed electrician. Plan 1-2 weeks for inspection. Owner-builder electrical is allowed only for owner-occupants on their primary residence.

Solar panels

Residential solar is usually over-the-counter under Title 24 streamlined permitting. Cost is typically $75–$200 and turnaround is 1-2 weeks. Rooftop and ground-mount both qualify.

Accessory dwelling units (ADUs)

Mountain View allows detached and attached ADUs on most lots under SB 9 and local zoning. Permitting is complex: seismic retrofitting of the main house is often required, water and sewer capacity must be verified, and parking is regulated. Plan 8-12 weeks for review.

Do I need a building permit in Mountain View, CA?