Common Mistakes People Make When Building a Custom Home

The costliest mistakes happen before construction: buying land without checking whether it can be built on, setting a budget that omits site work and energy code compliance, and leaving finish decisions until the house is already going up. All three are avoidable in a single free conversation.

The short version

• Buy land after talking to a builder, not before.
• A parcel that cannot be legally accessed cannot be financed or built on.
• Site work on rural land is a second budget, not a rounding error.
• Washington energy code compliance adds roughly $20,000 to $30,000.
• Every decision deferred into construction gets more expensive.

What is the most expensive mistake buyers make?

Buying land before anyone has evaluated it. A parcel can look ideal and carry a problem that makes it unbuildable or unfinanceable, and by the time that surfaces the money is already spent. A builder will usually walk a lot for free before you buy, which makes this the cheapest insurance in the entire process.

The version John Worlund tells is hard to forget.

"Some people bought eleven acres and didn’t know that they had to have a permit from Burlington Northern Railway to be able to cross the railroad tracks to that property. And the bank would not loan to them without that permit, and Burlington Northern was not forthcoming with the permit."

Eleven acres they could not legally reach. No access meant no financing, and no financing meant no house.

Before buying, confirm six things: water, septic feasibility and perc test, power distance, legal and physical access, zoning, and slope. Anasazi’s site visit is free whether you own the land or are still deciding.

What do people get wrong about the budget?

They budget for the house and forget everything around it. On rural land the well, septic, power extension, clearing and grading form a second budget entirely. And Washington energy code compliance adds roughly $20,000 to $30,000 to any new home, which almost nobody knows before setting a target.

On past Anasazi projects a well ran up to about $19,000 for roughly 270 feet, gravity flow septic $10,000 to $14,000, and an engineered system $14,000 to $25,000. Past examples, not quotes, and a finished subdivision lot with utilities stubbed in needs very little of it.

The other budget mistake is assuming what a quote includes. Landscaping, landscape grading, fencing, window coverings and driveway scope are typically outside the bid unless specifically priced.

Why does deferring decisions cost so much?

Because a decision made before the slab is poured is free to change, and the same decision made after the related work is built has to be paid for twice. Every finish you leave open becomes a change order waiting to happen, and change orders arrive at construction prices rather than planning prices.

The most expensive illustration John has: about six weeks into a build, a client’s wife arrived on site with an interior decorator. John got off the roof, drove to where the husband was, and told him directly that what they wanted would add two months and about thirty percent. The husband went ahead. It cost the extra hundred thousand and took the extra two months, almost exactly as quoted.

That project ended well because the number arrived before the work did. The mistake is not changing your mind. It is changing it without knowing the price first.

What do people underestimate about the timeline?

The planning half. Construction runs 5 to 6 months, which is the part everyone pictures. The full journey is 8 to 10 months, and the difference is design rounds with the architect, roughly thirty separate contacts across trades and agencies to produce a real price, your finish selections, and permitting.

Permits alone run one to three weeks in most Tri-Cities cities and about four weeks in the counties, longer during vacation season.

People also underestimate their own role. Selections have deadlines during construction, and a stalled decision stalls a trade. The full stage by stage process is here if you want to see where your input is required.

What else goes wrong?

Three things worth naming. Hiring a builder whose first house yours would be, because experience is what makes a bid complete. Trying to act as your own general contractor to save money, which usually costs more. And comparing bids that were never priced on the same specification.

That last one is where most people quietly lose money, and it happens before anyone touches dirt.

"Number one is: is it apples for apples?" John says. "That we’re being given the same instructions, the same specifications."

Should I get multiple quotes from custom home builders?

Most of these cost nothing to avoid and a great deal to fix. If you are looking at land anywhere in the Tri-Cities, have the conversation before you buy it.

Related: Red flags to avoid when hiring a custom home builder · How to hire a custom home builder