How is a spec home built? (the spec home construction process)

Nobody is waiting on a buyer's decisions when a spec home goes up, because the builder takes on the financial risk alone: it buys the lot, picks the floor plan, chooses every finish, pays for the construction, and only then sells the finished house. The U.S. Census Bureau calls this a home "built for sale," which it defines as a house "built on builder's land with the intention of selling the house and land in one transaction." That is the core of the spec home process, and it means the build runs on the builder's schedule from start to finish.

This page walks the actual steps, from the builder's first bet on a lot to the day you close. It is about the process, not the spec-versus-custom choice. If you want the side-by-side comparison of the two paths, see spec home vs custom home.

Step one: the builder picks the lot and the plan

The spec home process starts with the builder, not a buyer, making two bets at once: which lot to buy and which plan to build on it. The builder studies the local market, decides what kind of home will sell in a given area, then buys a lot that fits that home. In the Phoenix and Scottsdale metro, that might mean a four-bedroom single-story in Cave Creek or a larger two-story near Fountain Hills, depending on what buyers in that pocket want.

The builder then selects a floor plan. On a spec home the builder owns this decision completely. It chooses the room count, the ceiling heights, the garage size, the roofline, and how the house sits on the lot to handle the Arizona sun and monsoon drainage. The goal is broad appeal. A spec home is built to suit a typical buyer in that area, not one specific family, because the buyer does not exist yet.

This is the opposite of a custom build, where you bring the lot and the plan. On a spec home, the builder's read of the market is the whole starting point. A good builder gets this read right, and the home sells fast. A bad read leaves a home sitting unsold, which is the builder's risk to carry, not yours.

Step two: the builder finances and carries the build

The builder pays for a spec home up front, usually with a construction loan it carries until the house sells. This is the single biggest difference from a custom build, where the buyer's construction loan funds the work in draws. On a spec home you are not paying interest during construction and you are not signing draw approvals. The builder fronts the money and absorbs the carrying cost.

That financing reality shapes the timeline. A builder paying interest every month wants the house finished and sold quickly, so spec homes tend to move at a steady, efficient pace. There are no long pauses for a buyer to pick tile or change a wall, because there is no buyer yet. The builder also locks in its own pricing on materials and labor, so the cost is the builder's problem, not a moving target you have to manage.

Because the builder holds the loan, it also holds the title to both the land and the house until closing. The Census Bureau's definition is exact on this point: the house and land are sold "in one transaction." You buy them together at the end, as a finished package, the way you would buy any completed home on the market.

Step three: design choices get locked early

On a spec home, the finishes and layout are locked early, before or near the start of construction, because the builder is designing for the market rather than for you. The builder selects the cabinets, countertops, flooring, paint, fixtures, and appliances during planning. These choices are made to please a wide range of buyers, which usually means current, popular, mid-to-high finishes rather than bold or unusual ones.

How much a buyer can still change depends on timing. If you find a spec home early, when it is still framed and open, a builder may let you pick a few remaining items like paint color, a countertop, or a backsplash. If you buy a spec home that is already complete, the choices are done and you take it as built. This is why two buyers can have very different experiences with the same builder: one caught the home early, one bought it finished.

The trade-off is real and worth naming. You give up control over layout and finishes in exchange for speed and a known product. You are buying a house you can walk through, not a set of plans and allowances. For many buyers, especially those who do not have a strong opinion on every finish, that is a fair trade.

Step four: the same build process and inspections as any home

A spec home is built to the same code, with the same permits and inspections, as a custom home. The construction process itself does not change just because no buyer is attached yet. The builder pulls a permit from the city or county, builds to the locally adopted codes, and passes the same inspections at each stage: foundation, framing, mechanical, electrical, plumbing, and a final inspection before a certificate of occupancy is issued.

In Arizona, the builder must hold the proper license from the Arizona Registrar of Contractors (ROC) to build a home for sale. The residential class is a B General Residential Contractor license. A licensed builder is bound by the ROC's workmanship standards whether the home is custom or spec, so the quality bar set by code and licensing is identical. The home also carries the same implied warranty of workmanship that Arizona law gives new-home buyers.

This matters because a common worry is that a spec home is somehow built to a lower standard. It is not, at the code and inspection level. The foundation, the framing, the post-tension slab common on Arizona's expansive soils, and the systems all have to pass the same checks. For more on how that holds up, see are spec homes good quality.

Step five: the builder lists and sells the finished home

The final step is the sale, which can happen at any point from mid-construction to fully complete. A builder often lists a spec home once it is far enough along that buyers can see what they are getting, sometimes when drywall goes up. Whoever buys it gets a finished or nearly finished home and a known price, and can usually close in weeks rather than waiting out a full design and build.

This is also where the spec model serves the market. Nationally, 71.5 percent of single-family homes started in 2023 were built for sale, the category that includes spec homes, while custom homes (contractor-built plus owner-built) made up just 18.8 percent, about 177,850 homes. So most new homes follow this build-then-sell path. The spec process exists because most buyers want a finished home they can see, not a year of decisions.

We build spec homes when we see clear demand for a plan in one of our areas, from Scottsdale and Phoenix to Casa Grande and Apache Junction. The process gives a buyer a quality, move-in-ready home without the time and decision load of a ground-up build. If you would rather control the design and the lot, a custom build is the other route, and we do those too. Start with whether you want to pick the house or pick every detail of it.

Building with Jematell Homes

We build for the Sonoran Desert, not a generic climate. Reach out and we will talk through how this applies to your specific lot and plan.

Sources

• U.S. Census Bureau, Survey of Construction: Housing Construction Definitions (built for sale, contractor-built, owner-built)
• NAHB / Eye on Housing: Custom Home Building Share Declines in 2023
• U.S. Census Bureau, Survey of Construction (SOC)
• Arizona Registrar of Contractors