Quick Answer: Building a custom home in Mountain View means clearing four sets of requirements: zoning (setbacks, floor area ratio, height, daylight plane), design review if the house exceeds certain thresholds, Title 24 energy compliance including mandatory solar and all-electric readiness, and building code. Approvals run 6 to 14 months and city fees $70,000 to $160,000 including school fees. The requirement that most often forces a redesign is the daylight plane on side setbacks.
Mountain View is a well-run jurisdiction and a demanding one. The city cares about how a new house sits among its neighbours, and on the small lots that dominate the older neighborhoods that concern translates into real design constraints.
Zoning: the four numbers
| Limit | What it controls |
|---|---|
| Setbacks | How close you may build to each property line |
| Floor area ratio | Total building area relative to lot size |
| Height | Maximum building height, generally two storeys in R1 |
| Daylight plane | A sloping surface from each side line that the building may not penetrate |
The daylight plane is the one that redesigns houses. On a standard 60-foot-wide Mountain View lot, a full-width second floor will usually penetrate it. The house has to step in upstairs, which is why so many newer Mountain View homes have a narrower second storey than first. Designing a rectangular two-storey box and then discovering this is the most common expensive lesson here.
Design review: when it applies
Beyond building permit review, Mountain View applies discretionary design review to new single-family homes that exceed certain size or massing thresholds, and to homes in specific neighborhoods with adopted guidelines.
Design review looks at things a building plan check does not:
- How the mass reads from the street relative to neighbouring homes
- Privacy impacts, particularly second-floor windows overlooking neighbouring yards
- Roof form and how it relates to the prevailing pattern on the block
- Tree retention, and whether heritage trees are preserved
- Front entry scale, since oversized two-storey entries are a common objection
Design review adds 3 to 7 months and can require design changes. It is not a rubber stamp, and neighbour input is part of it. The practical mitigation is to design within the prevailing pattern from the start rather than seeking approval for something that stands out.
Energy and electrification
California requirements apply to every new home, and Mountain View has been ahead of the state on electrification.
- Solar photovoltaic is mandatory on new residential construction. $18,000 to $40,000 depending on size.
- All-electric or electric-ready design. Expect to plan for heat pump space heating, heat pump water heating and an induction-capable kitchen. Gas is increasingly disfavoured or restricted.
- Title 24 compliance covers envelope, glazing performance, duct sealing and equipment efficiency, documented by a consultant.
- EV charging readiness, meaning conduit and panel capacity provisioned even if the charger is added later.
These push the electrical service size up. A 200-amp panel is the practical minimum and 400 amps is increasingly specified on larger homes with heat pumps, EV charging and induction cooking.
What do the fees cost?
Budget $70,000 to $160,000 in city fees for a new custom home, filed with the Mountain View Building and Safety Division at 500 Castro Street.
| Fee | Typical range |
|---|---|
| Building permit (valuation-based) | $14,000 – $34,000 |
| Plan check | $11,000 – $26,000 |
| School impact fees | ~$5.17 per sq ft |
| Planning and design review | $6,000 – $18,000 |
| Public Works, utilities and encroachment | $8,000 – $28,000 |
| Park land dedication or in-lieu fee | Varies, can be substantial |
| Plumbing, electrical, mechanical | $2,500 – $6,000 |
On a 3,000 square foot home, school fees alone run about $15,500.
How long do approvals take?
| Stage | Duration |
|---|---|
| Pre-application and zoning verification | 2 – 6 weeks |
| Design and engineering | 5 – 10 months |
| Design review, where required | 3 – 7 months |
| Building plan check | 3 – 6 months including corrections |
| Total to permit | 6 – 14 months after design |
| Construction | 12 – 20 months |
Design review and building plan check can partially overlap, but design review has to conclude before the building permit issues, because the approved design is what gets built.
What about the existing house?
Most Mountain View custom homes replace an existing one. That brings its own requirements:
- Demolition permit with asbestos and lead survey beforehand. Survey $1,200 to $3,500; abatement, if needed, $8,000 to $40,000.
- Tree protection. Heritage trees on the lot are protected, and removal requires a permit that is not automatically granted. Protection during construction requires fencing and often arborist monitoring.
- Utility disconnection and reconnection, coordinated with the city and providers.
- Construction and demolition debris diversion, with documentation that a required share was recycled.
The sequence that avoids redesigns
- Zoning verification first. Setbacks, floor area ratio, height, daylight plane. Before any architect draws.
- Tree survey. Heritage trees can dictate the building envelope.
- Soils report. Determines the foundation system and therefore a large cost.
- Establish whether design review applies and read the applicable guidelines.
- Then design, inside all of the above.
Almost every expensive redesign in Mountain View comes from doing step 5 before steps 1 to 4.
Building here properly
Mountain View rewards projects that engage with the constraints early and penalises those that treat them as obstacles to argue with later. The daylight plane, the trees and the design guidelines are all knowable at the start.
King David Home Builders builds custom homes throughout Mountain View, Palo Alto, Los Altos and Sunnyvale, and runs zoning, tree and soils analysis before design so the house is drawn inside what the lot and the city allow. See our custom home builders in Mountain View page for project detail.
Frequently Asked Questions
What are the main requirements to build a custom home in Mountain View?
Four sets. Zoning covers setbacks, floor area ratio, height and the daylight plane. Design review applies to homes above certain size and massing thresholds. Title 24 energy compliance includes mandatory solar and electric-ready systems. Building code covers the rest. Approvals run six to fourteen months and city fees $70,000 to $160,000.
What is the daylight plane and why does it force redesigns?
A sloping invisible surface rising from each side property line that the building may not penetrate. On a standard 60-foot-wide Mountain View lot, a full-width second floor usually penetrates it, so the upper storey has to step in. Designing a rectangular two-storey box and discovering this afterwards is the most common expensive mistake here.
Does my project need design review?
It depends on size, massing and whether your neighborhood has adopted guidelines. When it applies, expect three to seven months added and real potential for required changes, since design review considers street presence, privacy impacts on neighbours, roof form and tree retention. Neighbour input is part of the process.
Is solar required on a new Mountain View home?
Yes. Solar photovoltaic is mandatory on new residential construction in California, costing $18,000 to $40,000. Expect also to plan for heat pump heating and water heating, EV charging readiness and an induction-capable kitchen, which together usually mean a 200-amp minimum service and often 400 amps.
What is required to demolish the existing house?
A demolition permit preceded by an asbestos and lead survey at $1,200 to $3,500, with abatement at $8,000 to $40,000 if either is found. You will also need a construction and demolition debris diversion plan with documentation, and any heritage trees on the lot are protected and require a separate permit for removal that is not automatically granted.