Adding a deck to your garden is one of the most rewarding DIY projects you can take on. Not only does it create a practical space for relaxing and entertaining, but it also adds value and appeal to your home. If you’ve never built decking before, the process can feel daunting, but with a little planning and the right materials, it’s very achievable.
This guide will take you through the basics of planning, choosing materials, and installing decking at home, while also highlighting the differences between traditional timber decking and modern composite alternatives.
Table of Contents
Step 1: Planning Your Deck
Before you pick up a saw, take time to plan your project.
- Measure your space – Decide on the size and shape of the deck. A simple rectangular deck is the easiest to start with.
- Consider placement – Think about sun exposure, privacy, and access from the house.
- Check permissions – In most cases, decking doesn’t need planning permission, but if it’s raised above 30cm or covers more than half your garden, check with your local authority.
- Budgeting – Factor in not only the boards but also joists, fixings, weed membrane, and any treatments or finishes.
Good planning prevents wasted materials and makes installation much smoother.
Step 2: Choosing Your Materials
One of the most important decisions is whether to use traditional timber decking or composite boards.
- Timber decking:
- Offers a natural look and feel.
- Affordable and widely available.
- Needs regular maintenance such as staining or oiling to protect against weathering.
- Can last decades if properly maintained, mentioned on UK Construction Blog.
- Composite decking:
- Made from a mix of wood fibres and plastic.Resistant to rot, splintering, and insect damage.Virtually maintenance-free – just a clean now and then.
- More expensive upfront, but can last a long time with less upkeep.
For DIYers, timber can be easier to cut and install with standard tools, while composite often uses hidden fastener systems that create a clean finish. The choice often comes down to your budget, aesthetic preference, and how much maintenance you’re happy to take on.
Whether you prefer the natural look of timber or the low-maintenance benefits of composite, Decking at Harlow Bros includes a range of options suitable for DIY projects, with durable, treated boards designed for outdoor use.
Step 3: Preparing the Ground
A strong, stable base is key to a long-lasting deck.
- Clear vegetation and level the ground.
- Lay a weed membrane to reduce growth beneath the deck.
- Use treated timber joists or a composite subframe to create a sturdy structure.
- Ensure the frame is level and square, as this will dictate the finish of your decking boards.
Step 4: Installing the Decking
Once the frame is in place, you can start laying the boards:
- Leave gaps – For timber, leave 5–6mm between boards for expansion and drainage. Composite boards often come with spacers for precise gaps.
- Fix securely – Use corrosion-resistant screws for timber. Composite systems may use clips that slot into grooves for a neat, screw-free surface.
- Trim neatly – Once boards are laid, cut the edges flush for a clean finish.
- Finish off – Add edging boards or fascia panels to hide the subframe and create a professional look.
Step 5: Aftercare
- Timber decking: Apply stain, oil, or paint to protect against moisture and UV damage. Reapply every year or two depending on exposure.
- Composite decking: Regular sweeping, immediate cleanup of spills, and periodic deep cleaning with a soft-bristle brush and soapy water
Final Thoughts
Building your own decking is a manageable project for most DIYers. The key is careful planning, choosing the right materials, and taking the time to prepare a solid base. Whether you go for the natural charm of timber or the low-maintenance benefits of composite, your new deck will transform your garden into a practical and inviting outdoor space.
