The All-In Budget: What a Custom Home Costs Beyond Your Builder's Contract

When people talk about what their house costs, they usually mean the builder's number. That's the biggest piece, but it isn't the whole thing. A custom home comes with a long list of costs that never show up in the construction contract, and they arrive from a dozen different directions.

None of them are surprises if you list them early. Most of them are surprises if you don't.

What's usually outside the contract

Every contract draws the line differently, so check yours against its exclusions. But these are the costs that commonly sit outside it.

Land and closing. The lot, closing costs, title insurance, and any carrying costs while you design.

Design and engineering. Architect, structural engineer, civil engineer, and sometimes a mechanical engineer, interior designer, or lighting designer. These are often paid directly by you, not through the builder.

Surveys and soils. Boundary and topographic surveys, soils reports, septic design, and sometimes a staking survey once construction starts.

Permits and fees. Building permits, plan review, and impact fees. Some contracts include the permit; many don't.

Utilities. Water and sewer tap fees, or a well and septic system if the lot needs them, plus connection fees for power and gas. See Before you buy the lot.

HOA and design review. Review fees, construction deposits, and any fees based on the size of the house. See HOA and design review.

Insurance. Builder's risk coverage during construction (check whether the builder carries it or you do), and home insurance once you move in.

Financing. Loan fees, appraisals, the lender's inspection fees, and interest during construction, which grows as the loan is drawn down.

Utilities during the build. Depending on the contract, power, water, and fuel for temporary heat can land on you.

Things excluded from the bid. Appliances, window coverings, low-voltage and audio-visual, landscaping, and hardscape are commonly excluded or carried only as allowances. What a complete custom home bid should include covers how to find them.

Moving in. Furniture, rugs, art, linens, kitchen gear, and moving costs. Plus rent or a mortgage on where you live now, for every month the build runs.

What it can look like

Here's an all-in budget for a custom home. Every number is illustrative, made up for this example and not a guide to what yours will cost.

Category	Amount
Builder's contract	$1,800,000
Land and closing	$450,000
Design and engineering	$160,000
Surveys, soils, and septic design	$15,000
Permits, taps, and impact fees	$60,000
HOA review fees and deposits	$10,000
Insurance during construction	$12,000
Loan fees and construction interest	$95,000
Window coverings	$35,000
Landscaping	$60,000
Furniture and moving in	$150,000
Rent during construction	$54,000
All-in	$2,901,000

In this example, the builder's contract is about 62% of the all-in cost. The point isn't the percentage, which will be different for every project. The point is that the house costs more than the contract, and the difference is big enough to plan for.

How to build yours

Start a simple list now, even if most of the numbers are guesses. Put the builder's number on one line and everything else below it, by category. Update it each time a real number comes in: a quote from the surveyor, the architect's fee, the tap fees from the utility.

Then use the all-in number, not the contract, when you decide what you can afford. A bid that fits your budget only works if everything around it fits too. And leave room. A contingency on the all-in number, separate from any contingency inside the builder's contract, is how you absorb the things nobody listed.

One more thing to watch: the line between the contract and everything else moves from builder to builder. If one bid includes permits and landscaping and another excludes them, the bids aren't comparable until you move those costs to the same side. How to get builder bids you can actually compare walks through that.

Questions worth asking

• Which of these costs does the builder's contract include, and which are mine?
• Who carries builder's risk insurance during construction?
• Are permit, tap, and impact fees in the bid, or paid directly?
• Which items are excluded or carried only as allowances?
• What will construction interest look like as the loan is drawn?