Build order is one of those things that seems flexible until you've done it wrong once — insulating before finishing electrical rough-in, or building cabinets before finalizing plumbing runs, both lead to redoing finished work. Here's the sequence that avoids the most common rework.

The Recommended Build Order

1. Inspect & repair (rust, mechanical) → 2. Plan layout fully → 3. Electrical & plumbing rough-in
→ 4. Insulation → 5. Wall/ceiling paneling → 6. Flooring → 7. Cabinetry & furniture
→ 8. Final electrical/plumbing connections → 9. Finishing details & testing

Step 1: Inspect and Repair First

Address any rust or mechanical issues before building anything on top of them (see our rust repair guide) — this is the step most likely to be skipped in excitement to start building, and the most expensive to go back and fix later once everything's built over it.

Step 2: Finalize Your Full Layout Before Touching Anything

Every downstream decision — where wiring runs, where plumbing goes, where windows and vents get cut — depends on a settled layout. Changing your mind about bed placement after electrical rough-in is a real, common cause of rework.

Step 3: Rough-In Electrical and Plumbing

Run wiring and plumbing lines through walls, floor, and ceiling before insulation and paneling go in, while everything is still fully accessible. This includes running lines to their final locations even if final connections (to appliances, fixtures) happen later — it's much easier to fish wire through open framing than through finished walls.

Step 4: Insulate

With rough-in wiring and plumbing lines already placed, insulation goes in around them (see our insulation guide) — full coverage, including ribs and cavities, not just flat panel areas.

Step 5: Wall and Ceiling Paneling

Cover the insulated surfaces with your chosen paneling material (see our plywood thickness guide for weight-appropriate choices by location).

Step 6: Flooring

Flooring typically goes in after wall/ceiling paneling is complete, giving you a finished, clean surface to build cabinetry and furniture on top of.

Step 7: Cabinetry and Furniture Construction

Build cabinets, the bed platform, and other furniture on top of the finished floor and against finished walls (see our cabinet building guide) — by this point, the wiring and plumbing behind these areas should already be roughed in and known, so cabinet design can account for planned access panels where needed.

Step 8: Final Electrical and Plumbing Connections

Connect appliances, fixtures, the water pump, and finish out the electrical panel/fuse block — the rough-in wiring and plumbing from Step 3 gets its final connections now that cabinetry provides mounting points and covers.

Step 9: Finishing Details and Full System Testing

Trim work, hardware installation, and a full test of every system (electrical circuits, water system, any heating/cooling) before considering the build complete — catching an issue now is far easier than discovering it on a first real trip.

Why Skipping Ahead Causes Real Problems

  • Building cabinets before finishing electrical rough-in commonly leads to cutting into finished cabinetry to fix a forgotten wiring run.
  • Insulating before finalizing layout risks insulation needing to be disturbed later if wall-mounted components move.
  • Skipping rust/mechanical inspection buries problems that get dramatically more expensive to address once cabinetry and paneling cover them.

This Order Isn't Rigid — But Deviating Should Be Deliberate

Some overlap between steps is normal and fine (e.g., finalizing some cabinetry details while still doing final electrical connections) — the point isn't rigid sequencing for its own sake, it's avoiding the specific, common mistake of building finished surfaces over incomplete rough-in work that becomes expensive to access later.

Frequently Asked Questions

What should I do first in a van conversion? Inspect and repair any rust or mechanical issues before anything else — building over an unaddressed problem is the single most expensive mistake to fix later in a build.

Should I run electrical wiring before or after insulation? Before — rough-in wiring and plumbing while framing and cavities are still fully open and accessible, then insulate around the completed rough-in.

Can I build cabinets before finishing electrical work? Not recommended — cabinetry built before electrical rough-in is complete commonly needs to be cut into or modified later to accommodate wiring that wasn't planned for in time.