How to Build a Garden Shed: Step-by-Step Guide

Building your own shed saves money and lets you customize every detail. Most DIYers can erect a wooden shed in a day with a helper; metal kits take longer due to numerous parts, while plastic models assemble in hours.

Preparation

• Treat floor joists with oil-based wood preservative (water-based won't stop rot). Apply two coats 24 hours apart.
• Level the site thoroughly—tamp soil with a sledgehammer or fence post.
• Measure the actual floor dimensions; don't trust advertised specs.
• Lay a paving-slab base on soft sand, exactly matching the floor footprint. Oversized bases trap rainwater.

Wall Assembly

1. Position the floor panel.
2. With a helper, raise the back wall and one side wall. Align corners precisely.
3. Secure panels with 75 mm coach screws (10–14 gauge) and washers—from inside so screws can't be removed by intruders.
4. Attach remaining side and front panels the same way.

Roofing

1. Cover roof panels lengthwise with roofing felt, allowing overhangs at each end.
2. Nail felt with large-headed, rust-proof clout nails spaced 10–15 cm apart. Press nails into felt with thumb before hammering to avoid splitting.
3. Add a center row of nails to prevent solar bubbling.
4. Overlap lower felt strips 5 cm under upper strips; cut V-notches at corners for neat eave folding.
5. Install ridge felt strip with overhangs, then attach barge boards.
6. Nail corner fillets (protective wood strips) to seal vertical edges.
7. Fit decorative finials—tradition says they deter the devil!

Guttering (Optional but Wise)

Install gutters with brackets ≤1 m apart, sloped toward a downpipe feeding a raised water butt. Overflow pipe prevents splash-back on shed walls. Free water for the garden!