Is this lot buildable? An Eastside custom-home checklist

Can I build the home I want on this lot?

Start with your project, not the property listing. Write a one-page brief with requirements, flexible preferences, and bonuses, then use the same two-question test for every lot. This keeps a view, mature landscaping, or low price from distracting you from a basic mismatch.

Have a Seattle or Eastside address already? Start with Build Eastside's free property feasibility study for an early public-record screen before paying for a full professional study.

• Fit: Can the legal building envelope, terrain, access, trees, private rules, and neighborhood support the house, yard, parking, sunlight, privacy, and views you want?
• Surprises: Beyond normal house construction, what could you spend on demolition, soil, foundations, drainage, utilities, oil contamination, access, frontage, consultants, permits, and time?
• Your requirements: Record the approximate living area, number of floors, bedrooms, garage spaces, accessibility needs, ADU or multigenerational space, outdoor priorities, and a real maximum all-in budget.

What does ‘buildable’ actually mean?

Buildable is not a single yes-or-no answer from a zoning map. A legal lot may allow a house but still fail your plan because the usable envelope is too small, access is impractical, protected features consume the best area, or site work overwhelms the budget. An irregular or sloped lot may still work well when the design fits the land.

• Legally eligible: Confirm the parcel can be developed for the intended residential use under current local rules.
• Physically workable: Fit the house, garage, driveway, utilities, drainage, outdoor space, and construction access together.
• Financially plausible: Price the land, house, site work, consultants, permits, financing, carrying costs, and unresolved risks as one project.
• Verified enough to decide: Separate what public records suggest from what still needs a survey, title review, utility confirmation, professional study, or city interpretation.

The checklist is universal. The rules are local.

Every lot should be screened for the same basic questions: legal status, zoning, house fit, access, utilities, terrain, critical areas, trees, title restrictions, daily livability, and all-in cost. The numerical answer must come from the jurisdiction that regulates the property. Do not carry a setback, height, FAR, lot-coverage, or critical-area rule across a city boundary.

Use the city guide directory to open the zoning, height, tree, view, critical-area, ADU, and permit resources available for the property's jurisdiction.

Build Eastside's feasibility study applies reviewed residential rules and public parcel data in Seattle and 14 Eastside cities. It remains an early screen: surveys, title, utility confirmation, city interpretation, and professional studies may still be necessary.

How much of the lot can you actually use?

The advertised or tax-record lot size is not the buildable area. The real test is whether the house, garage, driveway, utilities, drainage, outdoor space, construction access, and protected site features fit together, not whether a rectangle representing the house fits between approximate property lines.

1. Draw the real building envelope

Setbacks, floor-area limits, lot coverage, height, easements, critical areas, buffers, trees, driveway geometry, parking, and private restrictions all compete for the same land. Test them on one survey-based concept instead of reviewing each constraint in isolation.

Open the property's city in the local zoning, height, tree, and critical-area guide directory. Use the exact jurisdiction's articles and official sources; a neighboring city's familiar rule does not apply.

• What is the exact zoning, and is the parcel a legal building lot?
• What building footprint and total floor area could fit after required setbacks and other constraints?
• Is the lot wide and regularly shaped enough for an efficient plan, or will narrow frontage, an angle, a flag stem, or a pinch point force a custom footprint with wasted space?
• Does the height limit work with the existing grade and roof form, especially on a sloped site? Do not assume nearby houses prove what can be approved now.
• Which on-site or neighboring trees affect the house, driveway, utilities, excavation, root protection, or equipment access? Some cities tightly limit removal; others allow it with permits, retention targets, or replacement planting.
• If critical areas or buffers are present, does the jurisdiction use gross lot area, net or adjusted lot area, or a separate protected building envelope for its floor-area and coverage calculations?
• Does the concept leave room for a usable yard, daylight, privacy, parking, waste collection, mechanical equipment, and required stormwater facilities, not just the house?

2. Match the house to the topography

Flat lots are usually simpler to build, but a sloped lot can produce a better view, privacy, or daylight basement. The important question is whether the house form matches the land. Forcing a wide single-story rambler onto a steep site may be technically possible but can require a large stepped foundation, retaining, shoring, excavation, and fill. It is often more economical to design around the topography, or buy a lot whose topography fits your non-negotiable house type.

For slopes, wetlands, streams, or mapped hazards, use the city-specific critical-area and site guides. Public maps are an early screen, not a survey, wetland delineation, or geotechnical conclusion.

• How many feet does the land rise or fall from the street to the likely house location?
• Would a daylight basement or narrower multistory plan follow the land better than a wide slab-on-grade or crawlspace design?
• Can the driveway reach the house at a practical grade while preserving parking, fire access, pedestrian safety, and winter usability?
• Would the concept require tall foundation walls, retaining walls, shoring, or large amounts of soil export or import?
• Are steep slopes, wetlands, streams, flood areas, erosion hazards, landslide hazards, or their buffers mapped on or near the lot?
• Can workers, concrete trucks, cranes, and excavators actually reach the work area without relying on a neighbor's land?

3. Read the easements, HOA rules, and other private restrictions

Zoning is only part of the rulebook. An easement gives another party a defined right to use part of the property for access, utilities, drainage, or another recorded purpose. It can occupy the best building area, require ongoing access, limit excavation, or leave you responsible for maintenance. Physical access is not the same as legal access, and a utility easement does not necessarily grant driveway rights.

Use the preliminary title report as an index, then review the recorded documents with your title company, broker, surveyor, or real-estate attorney. Washington DNR's legal-access guidance explains why a visible road alone does not prove access rights.

• Read every title exception and obtain the recorded easement, plat, covenant, road-maintenance agreement, or declaration it references. A one-line title summary is not the operating language.
• Have the surveyor plot easements and known encroachments against the house, driveway, utilities, drainage, trees, and construction workspace.
• Confirm that the property has permanent legal access for both vehicles and utilities, along the route you expect to use.
• If there is an HOA or architectural committee, check height, floor area, setbacks, style, materials, colors, landscape, tree, view, demolition, construction-hour, completion-time, parking, staging, and approval rules.
• Ask whether the HOA requires neighbor notice, design review, deposits, damage bonds, contractor rules, or a shorter construction window than the city allows.

4. Design for views, sunlight, and the neighborhood you will actually live in

A view can add real enjoyment and value, especially in a higher-end home, but it should shape the plan rather than remain a listing-photo promise. Stand near the likely finished-floor elevations and decide which spaces deserve the view, often the main living areas, kitchen, outdoor room, or primary suite. Then test whether trees, a neighboring lot, or future construction could change it.

A scenic outlook is valuable, but it is not automatically protected. Use the local view-protection, height, and tree articles to separate today's condition from a city rule, covenant, easement, or other enforceable right.

• Orientation: Southern exposure usually offers the most sun; east favors morning light; west brings afternoon light and can add summer heat or glare; north often gives softer, more even light. Trees, slopes, and nearby buildings can change all four.
• Privacy: Test where windows, decks, driveways, and yards would face each other after the new house is built, not only where the existing house sits.
• Neighborhood fit: Ask whether the surrounding scale and sale values support the home you want, and whether a very different house could feel out of place or be harder to resell.
• Future construction: A concentration of older homes and recent teardowns may signal years of nearby redevelopment, truck traffic, noise, and changing views.
• Nuisances: Visit during school arrival, commute hours, evenings, weekends, and rain. Listen for busy roads, highways, aircraft, parks, loading, mechanical equipment, and emergency routes.
• Power infrastructure: Note overhead lines, transmission corridors, transformers, substations, water towers, utility facilities, streetlights, and utility easements. Decide whether their appearance, sound, access needs, and proximity work for you.
• Daily life: Test the real drive, walk, school route, transit, cell signal, delivery access, and winter approach rather than relying on a map pin.

Question two: what could surprise you beyond normal house construction?

The house price per square foot does not capture the cost of making the land buildable. Treat every site assumption as verified, allowed for, or unresolved. The unresolved list, not the listing price, is where budget regressions usually begin.

5. Investigate soil, excavation, foundations, and stormwater

Soil conditions affect several budgets at once. Weak or previously filled soils can require deeper foundations or ground improvement. Bedrock can make excavation and utility trenches slow and expensive and may limit practical foundation choices. Poor infiltration, shallow groundwater, steep slopes, or local stormwater rules can require a different drainage strategy, including detention, pumps, vaults or tanks, or an approved discharge route.

Use the local critical-area, grading, and drainage articles to identify likely studies and permit paths, then have the appropriate professionals verify the actual soil and water conditions.

• Review geologic maps, prior permits, nearby reports if legitimately available, and visible evidence of fill, settlement, seepage, erosion, or old retaining work.
• Ask a geotechnical engineer whether borings or test pits are warranted before the purchase contingency expires.
• Estimate excavation, rock breaking, shoring, dewatering, soil export, clean fill, haul routes, disposal fees, and retaining separately; 'site work' is too broad to price honestly.
• Trace where water arrives from uphill land and streets, where it collects during rain, and where roof, footing, driveway, and yard runoff could legally go.
• Have the civil and geotechnical teams coordinate infiltration feasibility, foundation drainage, retaining walls, and the local flow-control standard before the architecture is fixed.

6. Verify utilities, septic, and any old heating-oil tank

Do not assume water, sewer, electricity, natural gas, or modern communications are available just because a house already exists or a main is nearby. Older houses may use septic, wells, oil heat, overhead power, undersized services, or private lines. An extension, transformer, street cut, pump, easement, or system charge can add tens of thousands of dollars and long lead times.

For a suspected heating-oil release, start with Washington's Pollution Liability Insurance Agency, which provides technical-assistance and financial-assistance programs for qualifying heating-oil tank owners.

A straightforward tank decommissioning or removal and a petroleum cleanup are different projects. If sampling finds a release, excavation, disposal, testing, professional oversight, and cleanup documentation can turn a relatively limited scope into a tens-of-thousands problem. Get a site-specific assessment rather than relying on a generic tank-removal allowance.

• Water: Is there a meter and usable service line? If not, where is the main, who serves the parcel, is a street cut or extension required, and what connection or system charges apply?
• Sewer or septic: Is there a legal, adequately sized side sewer that can drain by gravity? If the lot uses septic, locate the approved system, reserve area, inspection history, and replacement feasibility before placing the house.
• Power: Is service overhead or underground, and can the provider supply the proposed load? Ask about new poles, transformers, trenches, vaults, easements, service upgrades, and lead time.
• Natural gas: Confirm that a main and service are actually available if the design depends on gas. Do not treat a gas appliance in a nearby house as provider confirmation.
• Communications: Verify which providers serve the address and how conduit can reach the house without conflicting with trees, drainage, or other utilities.
• Heating oil: Look for a fill pipe, vent, basement tank, abandoned lines, seller disclosures, PLIA records, permits, invoices, soil samples, and closure documentation. Ask whether any tank remains and whether a release was investigated.

7. Price access, demolition, and required site improvements

A buildable lot still needs a practical construction route. Narrow roads, steep driveways, tight corners, limited staging, overhead lines, neighbor coordination, or no place for cranes and concrete trucks can slow every trade. Hard access becomes a recurring cost, not a single line item.

Open the property's local grading, utility, demolition, and right-of-way guides. The requirement is project- and jurisdiction-specific, so ask for a written determination before carrying a zero-dollar allowance.

• Walk the route from the public street to the likely work area with the builder, not only with a passenger vehicle.
• Plan equipment access, worker parking, deliveries, soil export, crane picks, temporary utilities, erosion control, material storage, and protection of neighboring property.
• If there is an existing structure, price demolition, asbestos or other hazardous-material procedures, utility disconnections, tree protection, rodent control where required, and disposal.
• Ask the city what the project triggers in the public right-of-way. Depending on jurisdiction and scope, this may include a new driveway, curb, gutter, sidewalk, planter strip, street trees, drainage, utility trenches, pavement restoration, dedications, easements, inspections, or financial security.
• Kirkland, for example, separately evaluates Public Works improvements and frontage work; utility trenching and street restoration should not be buried inside a generic utility allowance.
• Confirm whether the HOA or a private-road agreement adds construction deposits, road repairs, truck limits, working-hour limits, or seasonal access rules.

8. Compare the all-in project cost, not just the land price

Build a lot-specific budget before deciding what you can pay for the property. Keep written quotes separate from allowances and unresolved risks so a low placeholder does not look like a real price.

Use the observed Bellevue versus Kirkland custom-home permit timing as schedule context, not a promised approval date.

• Property purchase, closing costs, financing, taxes, insurance, and the cost of carrying the lot during design and permitting.
• Survey, architecture, structural engineering, civil engineering, arborist, geotechnical, environmental, energy, and other consultants.
• Demolition, hazardous-material work, heating-oil tank investigation or cleanup, tree work, clearing, erosion control, excavation, rock, soil export, shoring, retaining walls, and drainage.
• Water, sewer or septic, stormwater, power, natural gas, communications, driveway, access, right-of-way, and frontage work.
• House construction, permits, utility and impact fees, sales tax, temporary services, landscaping, and move-in work.
• A contingency sized for what remains unknown. The more unresolved the site, the less useful a small generic contingency becomes.

9. Turn the unknowns into a purchase decision

Use a simple traffic-light scorecard. Green means verified and acceptable. Yellow means the issue can probably be solved but still needs a written answer, concept, study, or price. Red means the lot does not support a requirement, exceeds the budget, or cannot be verified before your decision deadline.

A useful feasibility result does not need a fully designed house. It should show a realistic building and driveway concept, the major constraints, a site-work strategy, an all-in cost range, and a short list of items that remain unverified.

If the early screen leaves important city questions, use the local pre-permit help guide to find available meetings, staff contacts, and official resources. Contract terms and deadlines should be reviewed with your broker or attorney.

1. Write the project requirements and maximum all-in budget before touring lots.
2. Screen public records, zoning, mapped constraints, permit history, trees, utilities, seller disclosures, title documents, private rules, and environmental records.
3. Walk the property at several times and photograph the street, boundaries, grade changes, drainage, trees, utilities, neighbors, and views.
4. Ask an architect to test a realistic concept, then bring in a surveyor, civil engineer, arborist, geotechnical engineer, or utility provider where the screen identifies risk.
5. Get written answers or allowances for every yellow item and reject any red item that conflicts with a true requirement.
6. Make the final price reflect the remaining cost, time, and uncertainty rather than hoping those risks disappear after closing.