Before You Buy the Land, Call an Architect

A beautiful piece of land can look like the perfect place to build a home. But views, acreage, and location tell you surprisingly little about what can actually be built there—or what it may cost to make it possible.

Several years ago, my partner and I purchased a small piece of land in West Marin. It had many of the things we wanted: extraordinary trees, views across the valley, privacy, and a setting that felt a world away from the city.

The obvious question was: Can we build the house we want here?

Answering it turned out to involve far more than looking at the zoning map.

The property was an undersized legal lot. Water service was uncertain. The nearest water main couldn't provide the flow required for firefighting. There was no municipal sewer, so the property depended on a septic system. Electrical service stopped well down the road. A nearby stream introduced environmental restrictions. Spotted owls affected when construction could occur. And the steep driveway needed to satisfy fire-access requirements without destroying two magnificent Douglas firs that were among the reasons we loved the property in the first place.

None of these issues, by itself, necessarily made the property unbuildable. Together, however, they had enormous implications for what we could build, where we could put it, how long approvals might take, and what the project would ultimately cost.

That is why land due diligence is not something I think of as separate from architecture.

It is where architecture begins.

Buildable Doesn't Always Mean Buildable

A parcel can be legally recognized as a building lot and still be extraordinarily difficult—or expensive—to develop.

Zoning is only the first layer. Setbacks, height limits, lot coverage, easements, environmental overlays, heritage trees, geological conditions, wildfire regulations, coastal restrictions, septic requirements, utility availability, and fire-department access can all reshape the apparent building envelope.

In some cases, a constraint can be addressed through design. In others, it requires additional infrastructure, an entitlement, a variance, or an expensive engineering solution. Occasionally, it reveals something more fundamental: the house a buyer imagines simply cannot be built on that property.

The important thing is to understand which kind of problem you're dealing with before you own the land.

The Real Cost of a Site Isn't the Purchase Price

Raw land can be particularly deceptive because so much of the cost is invisible.

Bringing electrical service hundreds of feet to a building site costs money. So does drilling a well, installing a septic system, improving a road, building retaining walls, creating fire-truck access, providing dedicated firefighting water, stabilizing a hillside, or satisfying environmental mitigation requirements.

Even an extraordinary view can have a cost. Undergrounding utilities to keep power lines out of that view may be worth every penny—but it should be part of the financial equation when deciding what the property is worth to you.

This is why we increasingly think about site analysis and preliminary development budgeting together. A $1 million parcel requiring $750,000 of unusual site infrastructure is a very different proposition from a $1 million parcel where those systems already exist.

The architecture hasn't changed yet. The economics have.

Some of the Most Important Information Isn't on the Listing

Our West Marin property was a good example.

Because the lot was smaller than currently permitted by its zoning, we needed to establish that it had been legally created before the current minimum lot-size requirements were adopted. That meant researching historic maps and property records.

The septic question required another kind of investigation. No current percolation test was included in the sale documents, but digging through county records uncovered two older successful tests. They couldn't guarantee approval of a future system, but they provided meaningful evidence about the underlying geology.

Then came conversations with the water district, fire department, county planners, and biologists.

None of this information was apparent while standing on the property.

Yet it was arguably more important to our purchasing decision than almost anything we could see.

Constraints Aren't Necessarily Bad

Architects spend much of their lives working with constraints, and constraints often make projects better.

A setback can create a courtyard. A difficult slope can generate an interesting section. A protected tree can become the organizing element of a house. A view corridor can determine where a room belongs. Fire regulations can influence material choices and landscape strategy in ways that ultimately give a project greater coherence.

The goal of due diligence isn't therefore to find a property with no problems. Such a property may not exist.

The goal is to know what the problems are and distinguish between constraints that can generate good architecture, constraints that can be solved with reasonable investment, and constraints that fundamentally undermine what you hope to accomplish.

That distinction is enormously valuable.

Start Designing Before You Design

This is also why I resist the idea that an architect's work begins when we start drawing a house.

Before there is a plan, there is a site. Before there is a site strategy, there are rules, physical conditions, infrastructure, ecology, climate, and economics. Understanding those forces establishes the territory within which the architecture can emerge.

For a property under serious consideration, we typically want to understand questions such as zoning and allowable development; access and fire requirements; utilities and water; sewer or septic feasibility; topography and geology; environmental constraints; significant vegetation; approval pathways; and unusual infrastructure costs.

Not every property requires the same investigation. A vacant parcel in rural Marin presents very different questions from a teardown in Pacific Palisades or an infill site in San Francisco.

The principle, however, is the same:

Learn as much as you reasonably can before making an irreversible decision.

The Best Time to Call an Architect May Be Before You Own the Property

Most difficult sites have solutions. Architecture and engineering are, in large part, disciplines of solving problems.

But not every problem has a solution that makes financial or architectural sense.

A relatively modest amount of investigation before purchasing land can expose a development cost you hadn't anticipated, identify an approval risk, reveal that the desired program won't fit—or confirm that an intimidating constraint is actually quite manageable.

In our case, we bought the West Marin property. We did so knowing that it wasn't simple and that several questions would ultimately need to be resolved through design and permitting.

But we bought it with our eyes open.

And when you're contemplating the land on which you may spend years designing and building a home—and potentially a significant portion of your wealth—that may be one of the most valuable things an architect can give you.