---
title: "Designing a Workshop Shed: Power, Light, Insulation and Mezzanine"
description: A storage shed only has to keep things dry. A workshop has to be a good place to spend a Saturday or a working week. That means thinking about the floor, power, light, temperature and air before the building is…
url: "https://steelspan.co.nz/advice/designing-a-workshop-shed-power-light-insulation-and-mezzanine/"
updated: "2026-11-09"
category: "Planning & Design"
---

# Designing a Workshop Shed: Power, Light, Insulation and Mezzanine

A storage shed only has to keep things dry. A workshop has to be a good place to spend a Saturday or a working week. That means thinking about the floor, power, light, temperature and air before the building is designed, not after it’s up.

## The floor

A power-floated concrete slab is the standard for a workshop: easy to sweep, roll trolleys on and bolt machines to. If you’re planning a car hoist or heavy machinery, the manufacturer will specify a minimum slab thickness and strength, so tell us before the slab is designed. A slight fall towards the door helps if you’ll wash down.

## Power

- Plenty of outlets around the walls and at the bench.
- Dedicated circuits for welders, compressors and big machines.
- Three-phase power if you’re running industrial equipment. Check what’s available at your boundary early.
- All wiring must be done by a licensed electrician. We can put you in touch with one, and on design & build projects we arrange the electrician and talk the details through with you.

## Light

Roof skylights give free daylight across a deep building. Add good LED lighting for winter evenings, and task lights over the bench.

## Insulation and linings

Uninsulated steel sheds can be cold in winter, hot in summer and prone to condensation dripping from the roof. Roof insulation and an anti-condensation layer make a workshop far more comfortable. Lining the walls protects the cladding from knocks and gives you somewhere to hang tools. When we line a Steelspan building, the ply can be screwed directly to the steel, and your shelving and hooks then screw straight into the ply. Timber battens are an option if you prefer.

## Air

Welding, grinding, painting and running engines all need ventilation. Plan opening windows, vents or extraction fans, and think about dust extraction for woodworking.

## Storage up high

A mezzanine over the bench or along one wall uses height you’d otherwise waste. It needs to be engineered for what you’ll store on it, with stairs and a balustrade, and it’s normally part of the building consent. See our mezzanine post.

## Doors and layout

Put the big door where vehicles come and go, and a separate access door near the bench so you aren’t opening the roller door every time. Keep the bench out of the line of the vehicle bay.

## Consent triggers

A toilet, a sink or a kitchenette means plumbing, and plumbing in a shed takes it outside the small-shed exemptions. Heating an office or lunchroom brings in energy-efficiency (H1) requirements for that space. Most workshops are over 30 m² anyway, so they’ll need consent.

## Talk to Steelspan

Tell us what you make, fix or build, and we’ll design a workshop around the work. Use our Easy Shed Quote or call 0800 787 726.