Prefab wall panels are built in a shop, but the project they go into is still a normal building project with a permit, an inspection schedule, an energy target and a stack of trades behind the framers. The questions below come up on almost every panelized build. Ask them early, while changes are still a conversation instead of a change order.
Permits: Who Applies and What Gets Reviewed
A building permit is issued for the building, not for the panels. The drawings your building department reviews are the permit set, and the panels are built from drawings that must match it. Ask who submits the permit, who answers plan-review comments, and how a revision during review reaches the panel shop. A comment that changes a wall after the layout is approved is far cheaper to absorb before fabrication starts than after.
It also helps to know how long each stage tends to take locally. A phase-by-phase range for Greater Victoria projects, from design through occupancy, is laid out in ACAP LTD's build timeline planner, and our own build timeline estimator shows how framing method shifts the framing portion. Use either as a rough guide, then replace it with dates from your own permit office.
The Step Code: What Should Be Decided Before Layout
The Province describes the BC Energy Step Code as part of British Columbia's path to net-zero energy ready new buildings by 2032, and its page on the Step Code is the place to start for the framework: BC Energy Step Code, Province of British Columbia. Which level applies to a given permit depends on the local government and the code edition in force, so ask your building department and your energy advisor rather than assuming.
For a local reading of how the Step Code and the Zero Carbon Step Code are applied across several Greater Victoria municipalities, this builder's overview is a useful second view: BC Energy Step Code and Zero Carbon Step Code for New Homes in Victoria. Treat it as a starting point and confirm current requirements with your own municipality.
What matters for panels is the wall assembly. Cavity depth, insulation strategy and any exterior insulation are set by the energy model, and they decide the panel thickness and what is built in the shop. Our wall effective R-value estimator shows why framing lowers the real performance of an insulated wall, and our primer on wall assemblies and framing tolerances covers the questions to put to the panel supplier.
Who Does the Rough-Ins
Panels are framing. Wiring, plumbing and ducting still have to get through them, and the work is done by licensed trades on a schedule that has to fit the inspections. Settle three things before the layout is approved: which openings and chases the shop should provide, which penetrations the trades will drill on site, and who confirms the engineer is comfortable with both. Our guide to wiring and plumbing in prefab wall panels goes through the details.
Questions for the Panel Supplier
- ✓What do you need from me to produce a layout, and what is your process for approving it? Our checklist of what to send a panel shop is a starting point.
- ✓What is in your scope: layout and shop drawings, fabrication, delivery, setting and bracing? Ask for it in writing.
- ✓What happens to cost and timing if a drawing changes after fabrication starts?
- ✓Are panels delivered open or closed, and what does that leave for the trades?
- ✓What tolerances do you build to, and what do you need from the foundation or floor deck to hit them?
- ✓How are panels labelled, sequenced and delivered, and what access and crane do you assume?
Questions for Your Builder, Engineer and Energy Advisor
- ✓Who verifies the as-built foundation dimensions before panels are released? See coordinating foundations and panel delivery.
- ✓Who owns the crane booking and the weather call on delivery day? Our wall panel weight estimator gives a rough lift weight to start that conversation.
- ✓Who signs off on envelope changes made once the walls are up?
- ✓When is any mid-construction airtightness check scheduled, and what must be finished before it?
- ✓Who coordinates the responsibilities in the first place? Who does what on a prefab framing job lays out a typical split.
Put the Answers in Writing
Good relationships carry a project a long way, and then a schedule slips or a drawing changes. A one-page scope that states what the shop supplies, what the builder verifies and who pays for the crane removes most of the arguments in advance. If you are ready to put numbers to your own drawings, send your plans for a written panel quote.
Frequently Asked Questions
Do prefab wall panels need a separate permit?
No. The building permit covers the building. The panels are built to match the permitted drawings, so confirm that the panel shop is working from the same revision your building department approved.
Does prefab framing automatically meet the Step Code?
No. The Step Code is a whole-building performance target. Wall assembly and build accuracy help, but compliance depends on the full design, modelling and testing by an energy advisor.
Who installs the wiring and plumbing in prefab walls?
Licensed trades do, as they would in site-built walls. What changes is the coordination: openings and chases may be set up in the shop, and the trades need to know where before the layout is approved.
Can I change the design after panels are ordered?
It depends on how far fabrication has gone. A change after fabrication starts can mean rework, so decide wall assemblies, openings and rough-in routes before the layout is approved.
How long will my project take?
Timelines depend on design, permit review, trade availability and weather. Use a planner for a rough range, then rely on dates confirmed by your builder and your building department.
Planning a build with prefab wall panels? Send your drawings and we will come back with questions and a written quote.
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