Can You Build on That Lot? Evaluating a "Difficult" Puget Sound Site Before You Buy

By Joshua Renich, Fox & Dahlia HomesLast updated: May 2026

Some of the best homesites in the Puget Sound are the ones other people gave up on. The steep lot with the water view. The wooded parcel with no road and no utilities. The narrow infill lot in a historic Tacoma neighborhood. We have spent more than three decades building on exactly these sites, and we will tell you upfront: a "difficult" lot is not the same as a bad one. But the difference between a remarkable homesite and a money pit is decided before you buy — not after.

This guide walks through how we evaluate a hard Puget Sound site, what to look for before you make an offer, and the questions that separate a buildable challenge from a true dealbreaker.

"Unbuildable" usually means "not yet evaluated"

Our company was founded by Lyle Fox, who came out of a professional land-surveying background and served two terms as president of the Master Builders Association of Pierce County. That surveying heritage is the reason we read land the way we do. Over the years we have taken on lots that buyers were told could not be built on — and turned them into the kind of homes that look like they always belonged there.

The reason those lots get written off is almost always the same: nobody did the homework. A slope, a wetland buffer, a shoreline setback, or a missing utility line looks like a wall until someone with the right background actually evaluates it. Sometimes the answer really is no. More often, the answer is "yes, here's what it takes, and here's what it costs." The whole point of evaluating a site before you buy is to know which one you are dealing with.

The seven things we check before anyone falls in love with a lot

1. Slope and soil. Puget Sound is full of hillside and bluff lots, and slope drives almost everything downstream — foundation type, drainage, retaining, and cost. Pierce County requires geotechnical studies and mitigation for development in mapped landslide and erosion hazard areas, with the level of detail scaled to the severity of the hazard. A geotechnical engineer's report is not a formality on these sites; it is the document that tells you whether and how the lot can carry a house.

2. Drainage and stormwater. Where does water go when it rains — and in this region, it rains. A site that sheds water onto a neighbor, or collects it against a foundation, creates both engineering and legal problems. On sloped lots, managing runoff is often the single largest piece of hidden sitework cost.

3. Shoreline and critical-area regulation. If the lot touches saltwater, a lake, a stream, or a wetland, it likely falls under Washington's Shoreline Management Act and the local critical-areas code. In Pierce County, shoreline development is reviewed against both the shoreline buffer requirements and Title 18E critical-areas regulations, and a building permit will not issue until that review is complete. New development on steep slopes and bluffs has to be set back far enough that future shoreline armoring is unlikely to be needed over the life of the home — a determination that comes straight out of the geotechnical analysis.

4. Setbacks and buffers. Critical-area buffers and shoreline setbacks quietly shrink the part of a lot you can actually build on. It is entirely possible to buy an acre and have a buildable footprint the size of a two-car garage. Worth knowing: in Pierce County, modifying a standard shoreline buffer by more than 25 percent triggers a shoreline variance — a longer, less certain approval path. We map the true buildable envelope before you make an offer, not after.

5. Access. A lot with no legal road access, or access only across someone else's property, is a legal project before it is a construction project. Easements, shared driveways, and right-of-way improvements can add real time and cost.

6. Utilities. On unsewered lots outside city limits, you are looking at a well and a septic system, and septic feasibility depends on a soil percolation test and an approved drainfield location. Power, water, and sewer connections that you take for granted in town can be five- and six-figure line items on a raw parcel. The fix is to price them in before closing, not to discover them after.

7. Permitting jurisdiction. Whether your lot sits inside Tacoma or Gig Harbor city limits or in unincorporated Pierce County changes which rules apply, who reviews your plans, and how long it takes. Knowing the jurisdiction up front shapes a realistic timeline.

Green lights vs. red flags

Site factor	Buildable challenge	Genuine red flag
Slope	Steep but stable per geotech; engineered foundation solves it	Active landslide hazard, no mitigation path
Critical areas	Buffer reduces footprint but a home still fits	Wetland or buffer consumes the entire buildable area
Access	Recorded easement or short driveway improvement	No legal access and an unwilling neighbor
Utilities	Well and approved septic feasible; costs known	Failed perc test with no alternative drainfield
Shoreline	Setback met with standard review	Build only possible with a variance that may be denied

Why we evaluate before you buy

The most expensive mistake we see is a buyer closing on a lot, then bringing in a builder to find out what is possible. By then the price is set and the surprises are yours to absorb. Our design-build model puts evaluation at the front of the process, where it belongs — one team handling the land development, the design, and the construction, so the site analysis directly informs what we draw and build.

That approach is how lots like Madrona Turret and our Kittitas mountain home came together: each had real site constraints, and each got resolved on paper before a shovel moved. You can see more of that work in our portfolio.

A short due-diligence checklist before you make an offer

• Order or review a recent survey and the title report, and read every easement.

• Confirm the zoning, jurisdiction, and any critical-area or shoreline designations.

• Get a geotechnical opinion on any sloped or bluff lot.

• On unsewered land, confirm septic feasibility with a perc test before you are committed.

• Price utility connections, access improvements, and sitework — not just the lot.

• Map the real buildable envelope after setbacks and buffers.

If you can check those boxes, a "difficult" Puget Sound lot can be the best decision you make on the whole project.

Frequently Asked Questions

What makes a Puget Sound lot "unbuildable"? Usually it is one of a few things: an unmitigable slope or landslide hazard, critical-area buffers that leave no room for a home, no legal access, or failed septic feasibility on an unsewered parcel. Many lots labeled unbuildable are simply un-evaluated and turn out to be buildable with the right engineering.

Do I need a geotechnical report before I buy? On any sloped, bluff, or shoreline lot, yes — or at least a geotechnical opinion. Pierce County requires geotechnical study for development in landslide and erosion hazard areas, and the report determines foundation design and required setbacks. It is far cheaper to learn the answer before closing.

How do shoreline rules affect what I can build? Lots on saltwater, lakes, streams, or wetlands fall under the Shoreline Management Act and local critical-areas code. These set buffers and setbacks that reduce your buildable area, and permits are not issued until that review is finished. Larger buffer modifications can require a variance.

Can you build on a lot with no utilities? Often, yes. It means a well and a septic system, plus bringing in power. The key is confirming septic feasibility through a soil percolation test and pricing the utility work before you buy, so there are no surprises.

Should I evaluate the lot myself or bring in a builder first? Bring in a builder who understands land development before you make an offer. The cost of an early site evaluation is small compared to closing on a lot whose constraints you do not yet understand.

Thinking about a hard lot?

If you are looking at a steep, waterfront, wooded, or otherwise complicated parcel anywhere in the South Sound, we are glad to take a look before you commit. Evaluating land is where we started, and it is still where we add the most value. Learn more about our land and lot development work, or get in touch and tell us about the site.

Image: photo by Robert So on Pexels