Prefab House Assembly: the Erection Day Hour by Hour
In just a few hours the shell stands: the erection day is the highlight of every prefab house project. This guide describes a realistic sample sequence hour by hour, shows what owner-builders must prepare beforehand, which delays are typical and what matters in the first inspection of the shell.
Months of planning, selecting fittings and factory prefabrication — and then the house goes up in a few hours. For many clients, assembly day (the "erection day", Stelltag) is the emotional highlight of the entire prefab house project: an empty foundation in the morning, a weatherproof, closed shell by the evening. So that this day runs smoothly, you should know what happens hour by hour, what you have to prepare in advance and which delays are typical. This guide describes a realistic sample sequence of the erection day for 2026 and explains what matters in the first inspection of the shell.
What happens on assembly or erection day?
Short answer: On erection day, the wall, ceiling and roof elements prefabricated in the factory are delivered by truck and mounted with a mobile crane onto the already-finished base slab or basement. A well-rehearsed assembly team puts the components together piece by piece, aligns them and screws them together. With a single-storey house, the shell is often "under roof" in one day; with larger houses, erection takes two to three days. The interior fit-out then follows over several weeks.
Erection day marks the transition from the factory to the building site. All the load-bearing components of your house — the exterior and interior walls, the floor slabs and the roof structure — were manufactured weather-protected in the production hall and, depending on the degree of prefabrication, already contain insulation, windows, conduits and sometimes even the façade surface. On the building site, these large elements are merely joined together. This is the central time advantage of timber-frame construction over solid construction. How the two construction methods differ economically is shown by the prefab house versus solid construction comparison. How this construction method works in principle is explained by the prefab house overview page.
Erection day hour by hour: a sample sequence
Short answer: A typical erection day in 2026 begins early in the morning with the setup of the crane and the delivery of the first elements. By late morning the exterior walls of the ground floor are usually up; in the early afternoon the floor slab follows, then the upper floor and finally the roof structure. In the late afternoon the shell is ready for the topping-out and is provisionally protected against rain. The exact times depend on house type, number of storeys, crane location and weather.
Sample sequence of an erection day (guide values, two-storey house)
| Time | Work step | Note for clients |
|---|---|---|
| 07:00–08:00 | Set up crane, secure site, deliver first elements | Keep access and setup area clear |
| 08:00–11:00 | Set and align ground-floor exterior and interior walls | Keep your distance, avoid the hard-hat area |
| 11:00–13:00 | Lay and screw down the floor slab | Plan for the team's lunch break |
| 13:00–15:30 | Erect upper-floor walls | Photos possible from a safe distance |
| 15:30–17:30 | Mount roof structure/roof elements | Highlight: the house is 'under roof' |
| 17:30–18:30 | Provisional rain protection, tidy up the site | Brief look at obvious anomalies |
This sequence is a guide value. A bungalow without an upper floor is often already finished in the early afternoon, while a large two-family house with an elaborate roof shape can easily take two to three days. How long the entire build takes from erection day to handover, you can read in the build time for a prefab house guide.
What must clients prepare before erection day?
Short answer: Before erection day, the base slab or basement must be finished, cured and precisely measured, because the elements are set onto it to the millimetre. In addition, the crane and truck need a load-bearing, wide access route and a sufficiently large setup area. Construction electricity and construction water should be available, the neighbours informed and the site secured. The manufacturer takes on many tasks — clarify in the contract exactly who organises the crane, access and securing.
- Base slab/basement finished, cured and released by the manufacturer — the most important milestone before erection day.
- Check the access for heavy trucks and the mobile crane: width, load-bearing capacity, turning space and mind low branches or lines.
- Ensure a sufficiently large, level crane setup area within reach of the foundation.
- Have construction electricity and water connected in good time — details are clarified by the servicing guide.
- Inform neighbours early about noise, the crane and possibly a short-term road closure.
- Clarify whether a traffic-law permit is needed for setting up the crane in public space.
- Record contractually who provides the crane, securing and disposal of packaging material.
The base slab is the decisive precondition: if it is not exactly square and to the correct dimensions, the prefabricated elements cannot be set cleanly. So check whether the manufacturer provides the foundation or whether you commission it separately — details on who is liable for what are clarified by the checking the construction contract guide. How erection day fits into the overall project sequence is shown by the construction process guide.
The crane is the day's most expensive cost factor
A mobile crane is usually billed by the hour or day. If it stands idle because of missing access, an unresolved permit or an unreleased base slab, that quickly costs several hundred euros extra. So clarify in writing beforehand who orders the crane, who is responsible for the access and what happens if the appointment has to be postponed due to weather.
Compare fixed-price quotes with a clear scope of services
Anyone who has cleanly regulated the crane, access, base slab and assembly in the contract experiences no nasty surprises on erection day. Request, free and without obligation, comparable quotes from suitable manufacturers in our network — with a transparent construction and service description.
Typical delays on erection day — and how to prevent them
Short answer: The most common delays on erection day arise from bad weather, an unreleased or imprecise base slab, an access route too narrow for the crane and truck, and missing permits for setting up the crane in public space. Delivery delays of the elements or an assembly team reduced by illness can also stretch the schedule. In case of a storm, continuous rain or frost, the erection day is postponed for safety reasons — this is normal and not a building defect.
Many of these points can be defused by good preparation. Weather is the only factor no one can control: in strong wind the crane may not lift large surfaces, and in wet and frost the workmanship suffers. A postponed erection day is therefore no cause for concern but a safety measure. Record in the contract how weather-related postponements and the associated costs are handled. What you can do if the build is delayed beyond that is explained by the build time guide together with the contract check guide.
No reason to panic over small deviations
That not every detail sits perfectly straight away on erection day is normal: small readjustments, provisional coverings and still-open connections are part of the shell. What is decisive is that load-bearing components are set professionally and the shell is closed weatherproof. Serious anomalies such as visible damage to elements, however, you should photograph and report immediately to the site management.
Inspection after erection day: not a formal acceptance
Short answer: Erection day is expressly not a building acceptance. The shell is erected, but the interior fit-out is still pending, and the legal acceptance takes place only at the end of the project. A first visual inspection is sensible, however: check the shell for obvious transport damage, poorly set elements or penetrating moisture and document anomalies with photos. The binding acceptance with a protocol takes place only at the handover of the finished house.
Do not confuse the enthusiastic viewing of the freshly erected shell with the legally significant building acceptance — only the latter triggers the warranty periods and brings the reversal of the burden of proof. How the formal acceptance proceeds and what you must pay attention to in the protocol is explained by the selection (Bemusterung) guide as a supplement to the actual handover. A structured viewing already before signing the contract — for example in the show home — prepares you for all these appointments; use the checklist for the show-home viewing for this.
How do things continue after erection day?
Short answer: After erection day, the interior fit-out begins, which for a turnkey prefab house in 2026 usually takes 8 to 14 weeks. In this phase, building services, screed, drywall, sanitary, electrical, floor coverings and painting work are carried out. With a self-finish house you take on part of these trades yourself. At the end comes the formal building acceptance, with which the warranty begins and the house is handed over ready to move in.
How much of this work the manufacturer takes on depends on the chosen fit-out level. An overview of the differences between turnkey, self-finish house and kit house helps with the calculation — see the fit-out levels guide and the own labour guide. Anyone who wants to calculate the total costs of their project uses the cost calculator.
From erection day to moving in — with the right manufacturer
A smooth assembly begins with a reputable provider and a clear service description. We put you in touch, free and without obligation, with suitable prefab house manufacturers so that you can compare build time, services and prices before you sign.
What does your dream house really cost?
Request suitable quotes from vetted manufacturers for free and compare the prices per square metre for your construction project.
Compare house prices nowImportant questions briefly explained
The most common price questions around Prefab House Assembly – answered concisely by the Prefabricated House editorial team (as of 2026).
