A spec home (speculative home) is a house a builder constructs without a buyer, to sell once it is finished or under construction. Most new single-family homes in the US are spec or production homes; custom homes built under contract for an owner were almost 20% of single-family starts in 2025.
Spec home vs custom home
| Spec home | Custom home | |
|---|---|---|
| Who owns the house during construction | the builder | the owner (builder works under contract) |
| Land | builder’s lot | owner’s lot |
| Design | builder’s plan | owner’s plan |
| Choices | limited or none | almost unlimited |
| Price | fixed, known upfront | depends on design and changes |
| Time to move in | immediate if finished | the full build time |
How much does a spec home cost?
In NAHB’s 2024 survey of builders, construction was 64.4% of the average new-home sale price, the finished lot 13.7%, builder profit 11.0% and overhead 5.7%. The median lot under new spec homes was worth $59,000 in 2025. You pay for the builder’s profit, overhead and sales costs in the price, but avoid construction-loan interest and overrun risk.
Pros and cons of buying a spec home
Pros: a known price, a finished or nearly finished house, a builder warranty and no construction loan.
Cons: little or no say over the layout and finishes, and the lot is the one the builder chose.
Should you build a spec home as an investor?
Spec building means carrying land, construction and holding costs until the house sells, so it suits experienced builders with financing in place. Construction lenders usually want a strong track record before lending on spec homes.
More on the building process
- Steps to building a house
- Home building checklist
- How long it takes to build a house
- Build vs buy
- Cheapest way to build a house
- How to choose a home builder
- Being your own general contractor
- What is a spec home?
Sources
- NAHB: Cost of Constructing a Home in 2024 (survey published January 2025)
- NAHB: Custom home building expanded in 2025 (March 2026)
- NAHB: Lot values slip for the first time since 2019 (July 2026)