Clyde Hill building permits, height and view rules: what you can build in 2026

Short answer: a new house, teardown rebuild or major remodel in Clyde Hill goes through the city’s own Building Department, and the rules that decide the house are few but strictly enforced. Every house lot is zoned R-1. No part of a structure may rise more than 25 feet above the lot’s 1953 ground. Front and rear setbacks are 30 and 35 feet, side yards depend on lot size, and coverage is capped at 30 percent for structures and 60 percent for all hard surfaces. Any project valued over $50,000 starts with a pre-application meeting, and construction noise has fixed hours, weekends included.

For how I work in the city, see the Clyde Hill architect page. Every number below comes from the Clyde Hill Municipal Code (CHMC) or the city’s own permit pages and handouts, as of September 2026. The code now lives on eCode360 (old codepublishing.com pages now point there) and includes legislation through April 14, 2026. Codes change, so confirm with the city before you rely on any figure.

One residential zone and the envelope it sets

Clyde Hill has four use districts: R-1 Residence, G-1 Government, S-1 School and B-1 Business (CHMC 17.12.010). Only R-1 is residential, so every house lot follows the same standards in CHMC 17.16. You can confirm that an address is inside city limits on the Address Map on the city’s Maps page.

The R-1 chapter controls a house through setbacks, height and coverage; neither it nor the general zoning provisions set a floor area ratio. The city’s Residential Zoning Rules handout (updated April 16, 2026) describes the result as a three-dimensional box the house has to fit inside. New lots must be at least 20,000 square feet with 100 feet of street frontage (CHMC 17.16.030), though many existing lots are smaller and the side yard rules below cover them. R-1 also allows cottages and, on lots meeting the minimum size, accessory dwelling units (city middle housing guides, 2025). This guide sticks to the single house.

Height: 25 feet above the 1953 ground

Height is the rule that shapes most Clyde Hill houses. The height at any point of a building may not exceed 25 feet, measured vertically above original grade (CHMC 17.16.020). Original grade means the lot’s topography at incorporation in March 1953, as determined by the city (CHMC 17.04.330).

• Fill added after 1953 does not raise your allowance. If an earlier owner built the lot up, the 25 feet is still counted from the lower 1953 ground.
• Every point counts. The city’s FAQ says the limit includes all parts of a structure. Only chimneys and small dish antennas are excepted, up to 5 feet above the building. On a sloping lot, the allowable roof steps down with the 1953 slope. Accessory structures stop at 12 feet.
• The survey carries it. The city’s Building Project Guide says height limits are strictly enforced. Original grade contours must be shown on the plans, the survey must set a permanent benchmark, and after framing a surveyor may have to certify heights and setbacks before the framing inspection passes.

Each property needs an original grade determination only once. If the house was built or remodeled after 1953, one is likely on file at City Hall. If the structures largely predate 1953, you file an Original Grade Determination application in person with two copies of a current survey, and the city returns a signed copy with the contours marked. Do this before design starts.

Setbacks and the 30 degree side yard rule

The front yard is 30 feet and the rear yard 35 feet. A setback is measured from the lot line to the eave line or the outermost part of the building, whichever is closer (CHMC 17.04.420), so roof overhangs have to fit inside the setback lines. Where a right-of-way, access easement or private road crosses the property, the measurement starts at its nearest edge.

Lot size	Minimum side yards	30 degree rule above 12 ft
15,000 sq ft or larger	15 ft on each side	No
Over 10,000, under 15,000 sq ft	10 ft on each side	Yes
10,000 sq ft or smaller	15 ft total, at least 5 ft on either side	Yes

Source: CHMC 17.16.050 and the city’s Residential Zoning Rules handout.

The 30 degree rule shapes upper floors. On a lot under 15,000 square feet, start at the side setback line, draw a line 12 feet up, then angle it away from the property line at 30 degrees. No part of the house, gutters included, may cross it. On a narrower lot this pulls the upper floor in or brings the roof down toward the neighbor, so I draw it in section on every side wall before the plan is fixed.

• Corner lots. Every yard facing a road is a front yard (SR 520 and 84th Avenue NE do not count), so a corner lot carries two 30 foot fronts (CHMC 17.16.070).
• Inside the setbacks. Fences and small garden structures aside, nothing more than 30 inches above original grade may go in the front or side setbacks. Small accessory buildings may sit in the rear yard 10 feet from the lot lines. Garages and carports may not sit in any setback.

Lot coverage: 30 percent structural, 60 percent impervious

Structural coverage is limited to 30 percent of the lot and impervious coverage to 60 percent (CHMC 17.16.080). The city measures both to the outermost projection, which its handout says includes overhangs, gutters and even light fixtures.

Lot size	Structural coverage cap (30%)	Impervious coverage cap (60%)
10,000 sq ft	3,000 sq ft	6,000 sq ft
15,000 sq ft	4,500 sq ft	9,000 sq ft
20,000 sq ft	6,000 sq ft	12,000 sq ft

Arithmetic: lot area x 0.30 and lot area x 0.60. Setbacks and height still apply on top.

Patios, decks, pools, walkways and driveways are left out of structural coverage when they are no more than 30 inches above original grade and not over a basement (CHMC 17.04.475). They still count as impervious, as do gravel and products sold as pervious pavers. Coverage counts footprint rather than floor area, so on a tight lot the height limit and a basement decide how much house you get.

A new home, a substantial remodel or a net increase of more than 750 square feet of impervious surface also requires a stormwater drainage or detention system, according to the Building Project Guide.

Views, trees and hedges

It is natural to look for a rule that protects views from a neighbor’s new house. On the building side, the controls I found are the 25 foot height limit and the setbacks; the R-1 chapter has no separate view review for houses. The city’s view law, CHMC 17.38, deals with trees.

• What counts. A vista of Lake Washington, bridges, skylines, landmarks, the Cascades or Olympics, or area communities and hills, seen from the living and entertainment areas of the home.
• What you can claim. Restoration of a view or sunlight you enjoyed at some point since you bought or occupied the property, once a tree on private property has unreasonably blocked it. There is no right to create a view you never had.
• Exempt trees. Trees 25 feet or less above original grade inside the buildable area of their owner’s lot, and trees older than the city’s 1953 incorporation.
• The process. Written notice to the neighbor, then a city arborist consultation and an offer of mediation, and only then a complaint to the city’s hearing examiner, who is directed to favor the least invasive fix.
• A trap for rebuilders. A tree owner has a defense if the complainant created or worsened the obstruction through a substantial remodel or rebuild. If your new house moves the main living level so it looks into a neighbor’s tree, the city process may not help you.

So place the living rooms to take the views that exist now. Hedges must be kept at 8 feet or lower above original grade and built fences at 6 feet without a permit, set 2 feet back in the front yard.

Two city reviews touch your trees. For a new home or substantial remodel, you meet the City Arborist on site before submittal about which trees can be kept, and that report joins the application. A landscape review is also mandatory for any permit that changes the footprint or exterior (CHMC 15.04.090), including a check for potential view issues, and must be approved before final inspection. The city’s tips sheet warns that a project affects neighbors “sometimes significantly, such as by a decrease in their view.” Talk to them early.

Remodel or rebuild: the substantial remodel threshold

The 2026 substantial remodel threshold is $493,000 of project value as determined by the building official, and it changes each January. Projects within 24 months of permit approval are added together (CHMC 17.60.030 and the Residential Zoning Rules). Cross it and the whole property, existing structures included, must meet current setbacks, height and coverage, plus current drainage rules with connection to the city’s stormwater system. Keeping a nonconforming structure may then take a variance, a formal city exception.

Demolishing 75 percent of the existing building’s fair market value during a remodel has the same effect. Below both thresholds, a legally nonconforming house (one built under older rules it no longer meets) may be altered where the work does not increase the nonconformity or is needed to meet code (CHMC 17.60.020). Finish that remodel within a year of starting or the house can lose that status (CHMC 17.60.030(E)).

That threshold arrives quickly. At my planning range of $300 to $550 per square foot for a whole house renovation, $493,000 covers only about 900 to 1,650 square feet of work ($493,000 / $550 = 896; $493,000 / $300 = 1,643). A real whole-house remodel in Clyde Hill is therefore likely to be held to the same zoning as a new house. Price both honestly; the wider decision is in remodel or tear down and rebuild.

Construction hours and site rules

Construction hours sit in the city’s noise code. Building, excavation, demolition, alteration or repair is allowed only from 7:00 a.m. to 6:00 p.m. on weekdays other than holidays, and from 10:00 a.m. to 4:00 p.m. on Saturdays, Sundays and holidays (CHMC 8.10.030(E)). To protect health or property in an emergency, the building official may permit other hours for up to three days at a time. A violation is a misdemeanor.

• Parking plan. Required for new homes and substantial remodels. Workers park on the site or the right-of-way directly in front, and a $250 cash deposit is due before the permit issues. Breaking the plan can bring a stop work order (CHMC 15.05.020).
• Streets. Dumpsters, equipment and construction vehicles may not sit in the right-of-way. Trucks over 40 feet need a Special Vehicle Length permit, and tandem dump trucks are not allowed.
• Housekeeping. Every contractor needs a Clyde Hill business license, and the street must be swept clean every evening.
• Before demolition. A pest control report of no rodent activity, and an asbestos survey and a demolition notice filed with the Puget Sound Clean Air Agency.

The permit path, step by step

The Building Department is at City Hall, 9605 NE 24th Street (425-453-7800). For a new house or rebuild:

1. Survey and original grade. A licensed surveyor’s existing conditions survey with 2 foot contours, then the city-signed original grade.
2. Tree preservation consultation with the City Arborist, before you submit.
3. Pre-application conference. Required for new homes, substantial remodels, additions, decks and other projects valued over $50,000 (CHMC 15.04.060(E)). Book it through City Hall; the fee is set by council resolution.
4. Other agencies. Bellevue provides water, sewer and fire service, so Bellevue Fire stamps a sprinkler determination on two plan sets and Bellevue Utilities issues availability certificates. Over 100 cubic yards of combined soil import and export triggers State Environmental Policy Act (SEPA) review. A basement passes that quickly: 2,000 square feet dug 9 feet deep is about 667 cubic yards (2,000 x 9 / 27).
5. Apply through the Citizen’s Connect Permit Portal, paying the plan review fee on your own valuation estimate; the building official sets the final valuation.

On the building code: CHMC 15.04.020 adopts the 2021 International Building and Residential Codes and the 2021 Washington State Energy Code with state amendments. Confirm the edition at the pre-application meeting, since state adoptions move.

Realistic timelines

The city’s Building Project Guide says a complete application should generally be approved or denied within 15 to 45 working days, and that major projects such as certain residences may take longer. SEPA review, generally three to four weeks, is extra and must finish before the permit issues. Confirm current review times with the city.

The clock after issuance matters just as much. Work must start within 180 days. The permit expires one year after issuance, and by then the exterior must be completely finished and the site stabilized. If not, renewal carries a penalty fee of at least 40 percent of the original building permit fee (CHMC 15.04.060(C)).

For planning I use 2 to 4 months of design to reach permit submission, Seattle’s permit times as a benchmark, 6 to 10 months for a new house (about 2 to 3 months for a remodel), 12 to 18 months for construction and 18 to 30 months from design start to move-in. Against a one year permit, the schedule should finish the exterior inside twelve months, or the renewal belongs in the budget. The full sequence is in the custom home timeline. My planning ranges for money are $400 to $900 per square foot for new custom home construction and typically $20,000 to $50,000 for demolition; more in what it costs to build a house.

Where an architect fits

Every rule above can be checked before design starts. I begin with the survey and original grade, draw the 30 degree lines and the 25 foot plane in section, and run coverage to the gutter line. The house is then designed inside the real envelope, so the pre-application meeting can focus on the project itself. Piper Cole designs houses and administers construction on your behalf. It does not build. More on the work I take on is in luxury home design on the Eastside.

Questions

Do I need a building permit in Clyde Hill?

Most work does. The city requires building permits for most remodels and alterations, all additions, re-roofs, window and door replacements, decks, pools and hot tubs, retaining walls over 4 feet and accessory buildings, plus separate permits for mechanical work, drainage, demolition, grading, right-of-way work and driveway replacement. Electrical permits come from Washington Labor and Industries and plumbing permits from King County. Applications go through the city’s Citizen’s Connect Permit Portal, and issued permits are valid for one year.

How tall can I build a house in Clyde Hill?

No part of a building may be more than 25 feet above the lot’s original grade, which is the ground as it existed when the city incorporated in March 1953, as determined by the city (CHMC 17.16.020). Only chimneys and small dish antennas are excepted, up to 5 feet above the structure. Accessory structures are limited to 12 feet. Original grade contours must be shown on the permit plans, and a surveyor may have to certify heights after framing.

What are the setbacks in Clyde Hill?

The front yard setback is 30 feet and the rear yard 35 feet. Side yards are 15 feet on each side for lots of 15,000 square feet or more, 10 feet on each side for lots over 10,000 and under 15,000 square feet, and 15 feet in total with at least 5 feet on either side for lots of 10,000 square feet or less. On lots under 15,000 square feet, a 30 degree angle starting 12 feet above the side setback line also limits the building. Setbacks are measured to the eave or outermost projection.

What are the construction hours in Clyde Hill?

Under CHMC 8.10.030(E), construction, excavation, demolition, alteration and repair are allowed from 7:00 a.m. to 6:00 p.m. on weekdays other than holidays, and from 10:00 a.m. to 4:00 p.m. on Saturdays, Sundays and holidays. The building official may permit other hours for up to three days at a time when urgently needed to protect health or property. Violations are a misdemeanor. Confirm current hours with the city.

How much of my lot can I cover in Clyde Hill?

Structural coverage is limited to 30 percent of the lot and impervious coverage to 60 percent (CHMC 17.16.080). Both are measured to the outermost projection of each structure, including overhangs and gutters. Patios, decks, pools, walkways and driveways no more than 30 inches above original grade are excluded from structural coverage but count as impervious. Products marketed as pervious pavers also count as impervious.

Is a pre-application meeting required in Clyde Hill?

Yes, for new homes, substantial remodels, additions, decks and other projects valued over $50,000, under the city’s amendments to the building and residential codes in CHMC 15.04. You schedule it by calling or emailing Clyde Hill City Hall, and the fee is set by council resolution. For new homes and substantial remodels the city also requires a site meeting with the City Arborist about tree preservation before permit submittal.

Does Clyde Hill protect views?

Clyde Hill’s view law, CHMC 17.38, deals with trees. An owner may seek to restore a view or sunlight enjoyed at any time since buying or occupying the property when a tree on private property has unreasonably obstructed it. The process runs from written notice to mediation to a hearing examiner. Trees 25 feet or less above original grade within the owner’s buildable area, and trees older than 1953, are exempt. Houses themselves are controlled by the 25 foot height limit and the setbacks.

How long does a Clyde Hill building permit take?

The city’s Building Project Guide says approval or denial of a complete application should generally occur within 15 to 45 working days, with major projects such as certain residences taking longer. SEPA review, generally three to four weeks, is extra and must finish before the permit issues. Once issued, the permit expires in one year, and the exterior must be finished by then or renewal carries a penalty fee. As a benchmark, Seattle permits take 6 to 10 months for a new house and about 2 to 3 months for a remodel.

When does a remodel have to meet current zoning in Clyde Hill?

When it becomes a substantial remodel. In 2026 that means project value above $493,000, counting multiple projects within 24 months of permit approval, or demolition of 75 percent of the existing building’s fair market value. The whole property, including existing structures, must then meet current setbacks, height, coverage and drainage rules. Below that, a nonconforming house may be altered where the work does not increase the nonconformity or is needed to meet code, and the remodel should be finished within one year of starting or the house can lose its nonconforming status.

Authoritative sources

Regulatory requirements referenced in this guide are set by the official agencies below. Rules change, always confirm current requirements with the source:

• Seattle Dept. of Construction & Inspections (SDCI)