A deck is essentially an open-air extension of your living space. Free-standing or attached to a house wall, decking creates a space that's ideal for outdoor entertaining, as a play area for the kids or simply somewhere to relax outdoors. It also offers an inspired solution to common garden problems such as slopes, or spots where the grass won't grow.
Decking is flexible, allowing you to extend, or update the features over time, as well as allowing you to work around fixtures such as trees or posts that you cannot, or don’t want to, remove from the area.
And you don't need to be a carpenter to build a deck - a few power tools, a basic tool kit and some woodworking skills are needed, so in most instances you can undertake the work yourself. Just be sure to plan carefully and check all your measurements, both at the planning stage and as you build. A second pair of hands will be useful too.
Interested in adding some decking to your outdoor space? Read on for our expert advice to help you kickstart your decking project.
Are you looking to create a place to entertain and socialise? An area where your children can play without getting dirty? Or do you want decking for your hot tub or pool? Knowing what you want to use your decking for will determine everything from location to what type of deck boards you should choose.
Check out our buyer's guide to decking. This covers the different materials available and some of the extra accessories that you may or may not need, depending on your decking structure.
When it comes to the size of your deck, think about the size of your garden. How much of your space do you want to cover with decking? Perhaps you love the idea of decking as a low-maintenance alternative to a lawn. Or maybe you want it to complement and work with your other landscaping such as paving and turf, and so are looking to achieve a balance that doesn't overwhelm your space. If in doubt, go conservative when it comes to size – you can always extend at a later date.
If you're looking to entertain on your decking, arrange your garden furniture in the space you're considering for decking. This will give you a rough idea of how much space you might need - and don't forget to allow room to move any chairs around.
Draw up a simple plan of your house and garden, and mark where you want to build your deck.
If your decking is to trim another garden feature such as a hot tub or pool, then your location is already set. However, if you have your pick, there are a few things to think about when choosing your site:
Rent a cable avoidance tool (CAT) to check for any pipes or cables beneath the proposed decking area. If found, we suggest reconsidering your decking plans.
Building regulations, planning permission and local byelaws can be complicated, subject to change and vary from place to place. Because of that, we can't advise on these issues in detail.
We do recommend that you:
There are many options when it comes to decking structures. We're going to run through the three most popular ones:
There are different ways of configuring your deck boards. Here are some of our favourite designs explained.
For the traditional decking look, choose to have your boards laid horizontally. For standard right-angled timber decking, measure a maximum of 450mm between the centre of one supporting joist and the centre of the next.
A more contemporary, yet still classic option, boards laid diagonally need joists spaced 300mm centre-to-centre for the structure to be secure.
For a decorative chevron pattern that is reminiscent of a parquet floor, your joists should measure 300mm centre-to-centre and you must lay a double joist where the boards meet in order to have space to fix them securely.
Another attractive option for those who want something a bit more decorative, the picture frame pattern has boards creating a border within the main design. You will need to adjust the framing to support the surface pattern in the corners. Decks are designed to take advantage of the angles of the joists for maximum stability, as illustrated.
When it comes to laying boards, reversible deck boards can be laid smooth or ridged side uppermost, or you can combine the various finishes for decorative effect. The easiest way to arrange them is at right angles to the supporting joists in a horizontal design – but you don’t have to. Decide on the pattern before you start, as the choice will affect the spacing and number of joists.
Once you’ve decided on the size and design of your decking, you’ll need to work out how many deck boards you’re going to need to complete your project.
To do this, we offer two easy-to-follow solutions - a decking calculator table or a simple equation. You don't need to do both, just choose your preferred method. Both options don't work for all calculations, so be sure to check which one best suits your project.
The table is based on our most popular timber board size – 2.4m long and 144mm wide - and includes the expansion gaps for timber (the calculations will be slightly different for Grassedeck, Walksure or solid composite deck boards). Just cross-reference your size of decked area (for example, 2 by 3m) and it presents the number of deck boards you will need.
If you're not opting for timber decking, or are looking to use timber boards in a different size than that referenced in the table, have a go with our decking equation.
For either option, you'll need to know:
Deck boards are laid with a gap between each individual one - both along their length and their ends. These are known as expansion gaps as they allow rainwater to easily run through the decking (rather than pool in an unwanted puddle) and for the deck to expand and contract due to changes in the weather.
Unlike with timber decking, solid composite deck boards don't allow for any flexibility with the size of the expansion gap running along the length of the deck boards, as the fixings used in laying only allow for one single size.
Ensure all measurements are in the same units.
Multiple the length (L) of your decking area by the width (W).
L x W = Decking Surface Area (DSA) in m2
Add the deck board width (W) to the Expansion Gap Length (EGL).
Add the deck board's Length (L) to the Expansion Gap Width (EGW).
Multiple these numbers together.
(W + EGL) x (L + EGW) = Single Board Coverage (SBC) in m2.
Multiple the Single Board Coverage (SBC, as calculated in step 2) by 1.1.
Divide the Decking Surface Area (DSA, as calculated in step 1) by the Single Board Coverage (SBC).
DSA / SBC x 1.1 = Total number of boards needed including wastage
Now that you've completed the planning process. it's time to start laying your decking and we have a number of articles to help you every step of the way. So, depending on your project, choose from the following how to guides to take your decking project to the next stage.