The custom home building process, step by step

1. Budget and financing (2 to 6 weeks)

Start with a realistic all-in number, including site work, design, permits and a reserve, not just a price per square foot. Then talk to a lender. Most custom homes are financed with a construction-to-permanent loan, which pays the builder in draws during construction and converts to a regular mortgage when the house is done. Expect to need around 20% down, though equity in land you already own often counts toward it. Construction-to-permanent rates usually run a little above standard 30-year mortgage rates.

2. Land (weeks to months)

If you don't own land yet, have a builder look at any lot before you make an offer. Slope, soil, access, distance to power and water, septic suitability, setbacks and HOA rules can each add tens of thousands of dollars. A survey, a soil or perc test and a call to the city or county about fees are worth doing before closing.

3. Design (1 to 8 months)

Design moves from a wish list to rough floor plans, then elevations, then full construction drawings with structural engineering. A modified stock plan can be ready in a month or two; an architect-led custom design often takes six months or more. This is the cheapest time to make changes, so take it slowly. Ask for rough pricing at the schematic stage so the design doesn't outgrow the budget.

4. Pricing and choosing a builder (2 to 6 weeks)

With drawings in hand, builders can give real bids. Compare allowances, exclusions, the builder's fee and how changes are priced, not just the bottom line. Some people pick a builder first and design with them, which tends to keep the design closer to budget. See questions to ask a builder.

5. Permits (1 to 6 months)

The builder or designer submits plans for review. Simple projects in smaller towns can be approved in a few weeks; coastal, resort and big-city jurisdictions can take six months or longer, especially with design review boards or HOA approvals. Impact and connection fees are usually paid at this stage.

6. Site work and foundation (1 to 2 months)

Clearing, excavation, utility trenches, footings and foundation walls, waterproofing and backfill. This is where surprises like rock or groundwater show up, which is one reason to carry a contingency.

7. Framing and dry-in (1 to 3 months)

Walls, floors and the roof structure go up, then sheathing, roofing, windows and exterior doors. Once the house is "dried in," weather matters much less. Walk through at this stage to check room sizes, window placement and ceiling heights while changes are still manageable.

8. Rough-ins and inspections (1 to 2 months)

Plumbing, electrical, heating and cooling, and low-voltage wiring are run through the open walls, then inspected. Mark outlets, lighting, speaker and TV locations now; moving them after drywall is expensive.

9. Insulation, drywall and interior finishes (3 to 6 months)

Insulation, drywall, then cabinets, countertops, tile, flooring, trim, paint, fixtures and appliances. This is the longest phase and the one most affected by finish level and how quickly selections are made. Late selections are one of the most common causes of delay.

10. Exterior, landscaping and final inspection (1 to 2 months)

Driveway, walks, grading and landscaping, often overlapping with interior work. The final inspection leads to a certificate of occupancy, and the construction loan converts to a mortgage.

11. Walkthrough, move-in and warranty

A walkthrough produces a punch list of small fixes. Most builders give a one-year workmanship warranty, with longer coverage on structure. Keep a list of anything that comes up in the first year and send it in writing.

How long it all takes

Your estimate includes a timeline for your size, finish level and area.