Build timelines

We quote a production window of 30 to 90 days rather than a fixed delivery date, and the reason is honest: the date depends on the queue. A fabrication facility has finite capacity, and where your module sits in the production sequence depends on how many orders are ahead of it when you reserve a slot. Material lead times move too — steel, glazing and mechanical equipment all have their own supply cycles, and a shortage in any one of them moves the band.

Seasonal demand is the other factor. Order volume in this category is not flat across the year, and a slot reserved in a slow month will move through production faster than the same order placed at peak. Anyone quoting you a guaranteed date months out without discussing their queue is either carrying enormous spare capacity or telling you what you want to hear.

What compresses the window in practice is preparation on your end. A permit application submitted early, a pad poured and cured before the delivery date, and utilities stubbed in the right place mean the module ships into a ready site. A module that arrives at a site that is not ready waits, and waiting is the most common cause of a project that took longer than the factory quoted.

Factory construction fails to deliver its schedule advantage for a small number of specific and repeatable reasons. None of them are the factory.

Permitting started late. The entire advantage of parallel scheduling depends on the permit application going in while fabrication proceeds. A buyer who waits for the module to be finished before applying has converted a parallel schedule into a sequential one and thrown away the benefit.

The pad was not ready. Concrete needs to cure, and a module cannot be set on green concrete or on a pad that is out of level. This is the single most common cause of a delivery that turns into storage charges.

Utility stubs in the wrong place. They are cast into the foundation. Moving them means breaking concrete, which means a new pour and a new cure.

A change order mid-fabrication. Changing a layout after the module is framed is expensive and slow in a way that changing it during design is not. Factory efficiency comes from committing to a design and building it without interruption.

Utility connection scheduling. The power company works to its own calendar, and a finished module waiting on a meter set is a finished module waiting. Coordinate this early; it is frequently the last item and the one nobody owns.

For a straightforward detached unit on a flat lot with utilities near the property line, the sequence runs roughly as follows.

Weeks 1–3: configuration and design finalisation, site visit, soil and access assessment, firm quote. This is also when the production slot is reserved, and reserving it early is the highest-leverage thing a buyer does.

Weeks 3–5: permit application submitted. Fabrication drawings released to the floor. These two happen simultaneously, which is the whole point.

Weeks 4–10: module in production. Concurrently, site work proceeds — clearing, grading, foundation forming and pour, then cure. Utility trenching completed.

Weeks 10–12: permit issued, module completed and quality-checked, freight scheduled, delivery window confirmed.

Delivery week: module transported and set, typically in a single day. Connections made over the following two to four days. Final inspection.

That is a ten to twelve week calendar on a good site, which sits comfortably inside the 30 to 90 day production window plus site work. The projects that run to the far end of the band are almost always the ones with slope, septic, long utility runs, or a jurisdiction seeing its first factory-built submittal.

A production slot is a place in the fabrication queue, and it behaves the way any finite capacity behaves: the earlier you claim it, the better the date. This is the part of the process buyers most often misunderstand, because in site-built construction there is no equivalent — a general contractor either has a crew available or does not, and the concept of a queue position does not exist.

What reserving early actually buys you is the ability to have fabrication underway while your permit is in review, which is the entire source of the schedule advantage. A buyer who finalises configuration and reserves a slot in week two, then submits for permit in week three, has both clocks running. A buyer who waits for permit approval before reserving has a sequential project with a factory attached, and will be disappointed by the total calendar even though the factory performed exactly as promised.

The corollary is that changes after a slot is reserved are expensive in schedule terms. Fabrication efficiency comes from an uninterrupted run against a fixed drawing set. A layout change in week six does not just cost the rework — it can cost the queue position, because the line moves on to the next order while yours is re-engineered.

Seasonality is the last variable worth planning around. Order volume in this category is not flat, and a slot claimed in a quieter month moves through production faster than the identical order placed at peak demand. If your project has any date flexibility at all, asking directly about current queue depth before committing is a reasonable question and any honest supplier will answer it.