Building the average single-family detached home takes 25.3 weeks, or about 5.8 months, according to the National Association of Home Builders. The figure comes from the October 2026 NAHB/Wells Fargo Housing Market Index survey, which asked builders how long each of seven major construction stages takes. It covers the steps a builder typically takes after buying a finished lot for a single-family detached home built for sale.
Interior finishes take the longest, at an average of 6.4 weeks. That stage includes drywall, interior doors, painting, cabinets, countertops, plumbing fixtures and flooring. Framing and major systems rough-ins, meaning HVAC and plumbing and electrical work other than fixtures, each take 3.7 weeks. Final steps such as landscaping, outdoor structures and clean-up require 3.6 weeks, while exterior finishes, including siding, roofing, windows and doors, take 3.4 weeks. Site work and foundations are the shortest stages, at a little over two weeks.
NAHB’s total is close to the Census Bureau’s average of 6.1 months. Census estimates show custom homes take significantly longer, NAHB notes, and times vary with geography and the characteristics of the home and builder. NAHB says the Census estimate rests on a considerably larger and more stratified sample and is the better source for total construction time. NAHB’s advantage is the stage-by-stage breakdown, which it says may help builders educate customers, decide when to buy materials, schedule inspections or manage subcontractors.
