Guide
Prefabrication saves money where work repeats. Walls built flat in a shop, electrical assemblies wired before they reach the site, bathrooms built as pods and set by crane: each pays when the same piece is built many times, when the site can take the deliveries, and when the drawings are final early enough for a shop to build to them. On a single house with one of everything, most of that saving never appears.
I am Sebastian Moreno Rivera, the owner of Build And Decor Construction. This page is the test I run before putting prefabrication in a brief, and the reasons it usually passes on a building and fails on a house.
Three places, and only three. Repetition: the shop sets up once and builds the same piece again and again, so the second one is cheaper than the first and the fiftieth is cheaper still. Conditions: a shop floor is dry, level and lit, and a crew that builds the same assembly daily is faster than a crew building it once. Schedule: pieces built while the foundation cures arrive when the site is ready for them, and the roof closes sooner.
Decisions frozen early. A panel is built to final drawings; a window moved after the shop has built the wall is a rebuilt panel, not a redline. A site that can take the deliveries: a crane with somewhere to stand, a street that takes the truck, a schedule the shop can hold. And tolerance: where the shop-built piece meets the field-built foundation, someone measures twice, and the brief names who.
One house has one of everything. Panelized walls can still save framing time on a simple plan with crane access and a crew that has set panels before, and a pre-wired assembly can pay where the same detail repeats, a row of identical bedrooms, say. A bathroom pod for one bathroom pays for a crane to set a room you could have framed in place. The brief usually says: panels maybe, pods no, and it says why for your plan.
Many units with the same plan are where prefabrication earns its name. The repeated walls, the repeated bathrooms, the repeated electrical runs are exactly the pieces a shop builds well, and the schedule saving compounds across floors. The costs (the frozen design, the crane, the tolerance work) are real on a building too, and the brief counts them. The answer on a building is usually yes, with conditions.
Count the repeats. Count the crane days and whether the site can take them. Count the decisions you are willing to freeze before the shop starts. If the repeats are few, the saving is small and the flexibility you give up is large. If the repeats are many, the saving is real and the discipline is the price. The consultation runs the count for your project and writes the answer with its reasons; the framing half of the question is on steel framing vs wood framing.