Sunnyvale Building Permits: A Home Seller’s Guide

Last updated: November 2026. Reviewed by the Cash Home Buyers CA team.

Sunnyvale requires permits for many jobs homeowners assume are routine, from reroofs to water heaters. Missing permits are one of the most common snags when a Sunnyvale home goes on the market.

Sunnyvale permits at a glance

Item	What the City says
Permit Center	City Hall, 456 W. Olive Ave, 2nd floor; 408-730-7444
Planning general	408-730-7440
Public Works Engineering	408-730-7415
Fire Protection Engineering	408-730-7212
Hours	Weekdays 8 a.m. to noon and 1 to 5 p.m.; Plan Check Engineer 8:30 a.m. to noon
Online	E-OneStop Online Services

Jobs that need a Sunnyvale permit

• Reroofing when more than 100 sq ft of roof covering is installed, repaired or replaced
• Bathroom remodels that replace a tub or shower or relocate plumbing fixtures or cabinets
• Kitchen remodels with cabinet replacement (not countertop replacement or refacing); moving walls or windows goes through the One-Stop Permit Center
• Water heater replacement (under 150 gallons, same location) and furnace replacement
• Skylights
• EV chargers: online if using the existing panel and meter; Permit Center if a separate panel or meter is needed
• Pool removal and private tree removal
• Short-term rentals of 30 days or less need a permit
• A planning permit for all exterior changes and additions

Over-the-counter plan check

For some projects you can use an over-the-counter appointment in the morning. Create an online account, generate a Building Permit with the description “OTC”, submit plans, then email pcappointment@sunnyvale.ca.gov with the permit number, project type and square footage, address, applicant name and phone, and attendee name and phone.

Permits and your sale

California sellers must disclose known unpermitted work on the Transfer Disclosure Statement. Buyers and lenders often ask for permit records for roofs, water heaters, furnaces and remodels. You can legalize the work, offer a credit, or sell as-is to a cash buyer.

Seller checklist

• List all work done since you bought the home.
• Look up the address in E-OneStop for permits and final inspections.
• Call the Permit Center at 408-730-7444 to ask how to legalize any gaps.
• Keep contractor invoices and sign-offs.
• Confirm any short-term rental permit status.

Closing costs

Santa Clara County’s documentary transfer tax is $0.55 per $500 of sale price, or $660 on a $600,000 sale.

How to sell a house in Sunnyvale

1. Review your permit history.
2. Decide whether to legalize, credit, or sell as-is.
3. Request a cash offer from us.
4. Pick a closing date, often within days.
5. Close through escrow and get paid.

Sunnyvale work that does not need a building permit

The City’s “Work Not Requiring Building Permit” handout lists exemptions drawn from the 2025 California Building Code. Knowing them helps you tell a permit gap from ordinary upkeep when a buyer asks about past work.

Work	Limit stated by the City
One-story detached sheds and similar structures	120 sq ft or less, no utilities connected; Planning approval may still apply
Fences	7 feet or lower, except swimming pool barriers; Planning may still review location
Retaining walls	4 feet or lower, measured from bottom of footing, with nothing attached
Roof repair or replacement	100 sq ft or less in any 12-month period
Window replacement	Same configuration, existing manufactured frame unchanged
Walks and driveways	Less than 30 inches above grade, not over a basement, not part of an accessible route
Awnings and shade cloth	Attached to single-family homes or duplexes, project no more than 54 inches
Prefabricated pools	Under 24 inches deep, entirely above ground, no more than 5,000 gallons
Cosmetic finish work	Painting, flooring, trim, countertops, cabinets mounted under 5 ft 9 in

The handout also covers minor electrical and plumbing work: replacing receptacles, switches and lights in existing boxes in the same location, replacing breakers and fuses (replacing a main disconnect does need a permit), temporary decorative lighting up to 90 days, repairing toilets, faucets and sinks in the same location, and clearing stoppages. Replacing concealed drain, water, waste or vent pipe counts as new work and needs a permit.

Where exempt does not mean free of review

• Exterior painting may need Planning approval depending on the zoning district.
• Sheds and fences may still need Planning approval based on height and location.
• Public sidewalk or driveway curb cut work needs Public Works review, reached at (408) 730-7415.
• Above-ground pools with water deeper than 18 inches need a protective barrier.

ADU permits in Sunnyvale

ADUs are the largest permit category sellers ask about. The City’s brochure gives a typical review timeline of two to four weeks from fee payment, and the Building Division can be reached at building@sunnyvale.ca.gov or (408) 730-7444 at the One-Stop Permit Center, 456 W.

Olive Ave. A Transportation Impact Fee applies to ADUs over 750 square feet, and a school impact fee applies to new-construction ADUs of 500 square feet or more.

Reading your permit history before a sale

• List every improvement you or a past owner made: additions, garage conversions, decks, bathroom or kitchen remodels, water heaters, panels.
• Match each item to a permit that was finaled. Exempt work will not appear in the record, so note why it did not need one.
• Flag any open or expired permit. A buyer’s title and inspection process will find it.
• Decide whether to close permits before listing or sell as-is and let the price reflect it.

Cosmetic work and a replaced faucet rarely matter. A converted garage or an added room with no final permit does.

Using the over-the-counter appointment well

Over-the-counter plan check is for some projects and happens in the morning. Create an online account, generate a Building Permit with the description “OTC”, submit plans and then email pcappointment@sunnyvale.ca.gov with the permit number, project type and square footage, address and contact details. Missing details delay the appointment, so send everything at once.

Reroofs, water heaters and the 100-square-foot rule

Reroofing needs a permit when more than 100 square feet of roof covering is installed, repaired or replaced. Water heaters under 150 gallons in the same location and furnace replacements need permits too. If these were done by a handyman, check the permit record and the final.

Bathroom and kitchen remodels

Bathroom remodels that replace a tub or shower or relocate fixtures or cabinets need a permit. Kitchen remodels with cabinet replacement need one, though countertop replacement or refacing does not. Moving walls or windows goes through the One-Stop Permit Center. Many sellers assume a remodel was cosmetic when it was not.

Short-term rentals and exterior changes

Short-term rentals of 30 days or less need a permit, and a planning permit is required for all exterior changes and additions. If you rented nightly or added to the house, check what was approved. A buyer will ask.

Frequently asked questions

Do I need a permit to replace a roof in Sunnyvale?

Yes, when more than 100 sq ft of roof covering is installed, repaired or replaced.

Do I need a permit to replace a water heater?

Yes. The City lists water heater replacement under 150 gallons in the same location as a permit job.

How do I apply?

Through E-OneStop Online Services, or at the Permit Center at 456 W. Olive Ave.

Can I sell with unpermitted work?

Yes, with disclosure. A cash buyer can purchase as-is.

Do I need a permit for a shed in Sunnyvale?

Not for a one-story detached shed of 120 square feet or less with no utilities connected, but Planning approval may still apply depending on location and height.

Can I replace windows without a permit in Sunnyvale?

The City exempts window replacements where the new window has the same configuration and the existing manufactured frame stays unchanged.

How high can a fence be without a building permit?

Fences not over 7 feet are exempt from a building permit, except swimming pool barriers, though Planning may review the location.

How long does ADU review take in Sunnyvale?

The City’s ADU brochure gives a typical review timeline of 2 to 4 weeks from fee payment.

What are the Sunnyvale Permit Center hours?

Weekdays 8 a.m. to noon and 1 to 5 p.m., with the Plan Check Engineer available 8:30 a.m. to noon, at City Hall, 456 W. Olive Ave, 2nd floor.

Does a Sunnyvale reroof need a permit?

Yes, when more than 100 square feet of roof covering is installed, repaired or replaced.

More guides

• Sunnyvale code enforcement guide
• Sunnyvale zoning and ADU guide
• Santa Clara County property tax guide

Sources

• City of Sunnyvale, Permits

This guide is general information, not legal advice. Confirm current rules with the City of Sunnyvale.