Why order matters
A van is built in layers, and each layer hides the one beneath it. Wiring and plumbing disappear behind walls; walls disappear behind cabinets. If you finish a layer before the hidden work under it is done, you pay for it twice. A little sequencing discipline saves days of rework and a lot of frustration.
Everything that hides inside a wall, wiring, plumbing, and insulation, must be roughed in and tested before that wall is closed. Plan your layout so you know where those runs go before you start.
The build sequence
Most successful builds follow roughly this order. Some steps overlap, but the dependencies hold:
- Plan the layout. Lock the floor plan so you know where everything lives.
- Prep and rust treatment. Fix and protect bare metal; it is your only chance to reach it.
- Sound deadening on large panels (optional).
- Electrical and plumbing rough-in. Run wires and water lines to where fixtures will be, before insulation and walls.
- Insulation. Fill the cavities (see insulation).
- Furring / framing to mount walls and cabinets.
- Floor. Subfloor and finished flooring.
- Walls and ceiling paneling.
- Cabinetry and furniture, bed frame, galley, seating.
- Appliances and fixtures, fridge, sink, heater, fan.
- Terminate electrical, connect the battery, panels, and circuits.
- Test everything, then finish and trim out.
Rough-in before you close
The most important discipline: run and label all wiring and plumbing, and test it, before insulation and walls go up. Pull a few spare wires to likely future spots while it is easy. Photograph every wall before you cover it, so you know where the runs and framing are when you drill later.
Dry-fit everything. Position cabinets, the bed, and appliances loosely and live with the layout for a day before you screw anything down. It is far cheaper to move a line on the floor than a wall.
A realistic timeline
DIY builds take longer than anyone expects. A full conversion is commonly 300 to 700+ hours of work. What that means in calendar time depends on your pace:
- Weekends (about 8 hrs/week): often a year or more.
- Part-time (about 20 hrs/week): a few months.
- Full-time (about 40 hrs/week): roughly 8 to 12 weeks.
- A professional shop typically quotes a lead time of a couple of months plus build time.
Add buffer for waiting on parts, redoing your first attempts, and the finish work that always takes longer than expected.
Order-of-operations gotchas
- Set bed height around what the garage must hold, before building the frame.
- Mount the roof fan and any roof penetrations before the ceiling goes up.
- Get heavy items in (batteries, water tanks) before boxing them into a space too small to remove them from.
- Test systems live before the final panels hide the connections.
Common mistakes
- Closing walls before wiring and plumbing are run and tested.
- Skipping rust treatment while the metal is reachable.
- No photos of what is behind the walls.
- Building furniture before the layout is truly settled.
- Underestimating the timeline and the finish work.
Quick checklist
- Lock the layout before cutting anything
- Treat rust and rough-in wiring/plumbing first
- Test hidden systems before closing walls
- Photograph every wall before covering it
- Insulate, then floor, walls, cabinetry, appliances, finish
- Budget realistic hours and add buffer