What Size Shed Should I Build?

4 October 2026

Start with what you're storing or doing

Before you think about length and width, list out exactly what the shed needs to hold. A shed for a ride-on mower and garden tools looks nothing like a shed for a boat, a caravan, or a full home workshop. Be specific rather than general.

• Vehicles: cars, utes, 4WDs, trailers, caravans or boats
• Machinery: tractors, excavators, ride-on mowers, farm equipment
• Workshop space: workbenches, tool storage, a work vehicle bay
• General storage: garden gear, outdoor furniture, seasonal items

Once you know what's going in, measure the actual items. Don't guess. A caravan's length and height, a tractor's width with attachments on, or a boat's trailer length all matter more than a rough estimate.

Think about how you'll move around inside

A shed isn't just a box that fits your gear. You need room to walk around a parked vehicle, open car doors fully, swing tools, or manoeuvre machinery without scraping walls. As a rule of thumb, add clearance on every side rather than sizing to the exact footprint of what you're storing.

If you're combining uses, such as vehicle storage plus a workshop bench, plan them as separate zones within the shed rather than squeezing a bench into leftover space. This usually means adding a bay rather than shrinking your work area.

Don't forget height

Height gets overlooked more than length and width, but it matters just as much. Consider:

• Roller door height needed to clear your tallest vehicle or equipment, including roof racks, antennas, or raised trays
• Clearance for a vehicle hoist, mezzanine storage, or overhead shelving
• Headroom for comfortable work if you're using the space as a workshop
• Whether you might store a caravan or boat with a high profile now or in future

Height requirements can be affected by local planning rules, so confirm what's permitted on your site with your local council or a building professional before locking in a design.

Plan doors around real-world use

Door width and placement affect how usable a shed actually is day to day. A single roller door might suit a small storage shed, but a shed used for vehicles or machinery usually needs doors wide enough to drive through without edging in slowly, plus a personal access door so you're not opening the roller door for quick visits.

Build in room to grow

Most people who undersize a shed do it because they size for today's needs only. If there's a reasonable chance you'll add a second vehicle, upgrade machinery, or want a workshop corner down the track, it's worth discussing a larger footprint now. Adding an extra bay during the original build is generally more straightforward than trying to extend later.

This is where custom sizing helps. Rather than picking from a fixed set of kit dimensions, a custom shed can be designed around your block, your budget, and your actual list of uses.

Common shed sizes and what they suit

These are general guides only. Actual sizing should be based on your specific items and site, not a standard chart.

• Small single-bay sheds: garden tools, mowers, bikes, general storage
• Double garage style sheds: two vehicles, or one vehicle plus a workshop bench
• Triple bay and larger: multiple vehicles, boats, caravans, or machinery plus workshop space
• Large span sheds: machinery, commercial use, or acreage properties with multiple equipment types

Get the site checked before you finalise a size

The size you'd like and the size your block can accommodate aren't always the same thing. Boundary setbacks, site slope, and access for trucks during construction can all affect what's achievable. A site visit will confirm what fits and flag anything that needs council approval.