How Much Does Decking Cost in the UK? (2026 Guide)

Decking is one of the most popular garden projects in the UK — and one of the most misunderstood when it comes to cost. Many homeowners budget for materials and forget about groundwork, balustrades, and the sheer range in quality between timber types.

This guide covers the full picture: what decking actually costs in 2026, the difference between timber and composite, what affects your final quote, and how to get the most from your budget.

Average Decking Costs in the UK (2026)

Here's a breakdown of typical installed costs, including materials and labour, for different decking specifications:

For a typical 20m² deck — roughly 4m x 5m — you're looking at:

• Softwood: £2,400–£3,600
• Hardwood: £3,500–£5,000
• Composite: £4,000–£7,000

These figures assume a straightforward ground-level installation with no steps or raised sections. Add steps, balustrades, or lighting and costs increase accordingly.

What Affects the Cost of Decking?

Material Choice

Pressure-treated softwood (typically pine) is the most affordable option and perfectly adequate for most gardens. It needs treating every 2–3 years to maintain its appearance and resist rot. Hardwood decking — oak, Ipe, or Cumaru — costs more upfront but lasts significantly longer and weathers more gracefully. Composite decking is the premium option: it looks similar to timber, requires almost no maintenance, and most manufacturers offer warranties of 20–25 years. The higher upfront cost often makes financial sense over a 15–20 year horizon.

Size and Shape

A simple rectangular deck is the cheapest to build. L-shapes, curves, and multiple levels all add to labour time and material waste. If you're working to a budget, a clean rectangular design will always give you the most deck for your money.

Height and Ground Conditions

Ground-level decks require the least groundwork. A raised deck — built over a slope, above an existing hard surface, or elevated to match a door threshold — needs a more substantial frame and potentially concrete footings. Each extra 30cm of height typically adds 15–25% to the structural cost.

Steps, Balustrades, and Lighting

Each flight of steps adds roughly £300–£600 depending on width and material. Balustrades — required by building regulations for decks over 600mm above ground — typically cost £150–£350 per linear metre installed. Built-in LED deck lighting adds £50–£150 per fitting, depending on the system chosen.

Labour Costs

Decking installation is skilled carpentry work. Day rates for experienced decking contractors typically run at £250–£400 per day. A 20m² deck usually takes 2–4 days to install depending on complexity — so labour alone can be £500–£1,600 before you've bought a single board.

Timber vs Composite Decking: Which Is Better Value?

The honest answer depends on your time horizon. Softwood decking costs less upfront but requires annual cleaning and treatment every two to three years — factor in 20 years of that, and you've spent a significant amount in ongoing maintenance and materials. Composite decking costs roughly twice as much to install but requires little more than an occasional wash with soapy water.

If you're planning to stay in your home for more than ten years and don't want the hassle of annual maintenance, composite often works out cheaper in the long run. If you're selling within five years, softwood makes more financial sense.

Do You Need Planning Permission for Decking?

In most cases, no — but there are conditions. Decking is generally covered by permitted development rights if:

• The deck is no more than 300mm above ground level
• It and any other outbuildings cover less than 50% of the garden
• It's not on the roof, balcony, or in front of the house

Raised decks over 300mm may require planning permission. If your property is listed or in a conservation area, additional restrictions may apply. Always check with your local planning authority before starting work.

How to Save Money on Decking

• Get three or more quotes — labour costs vary widely between contractors
• Choose pressure-treated softwood if budget is your primary concern
• Keep the design rectangular — complex shapes add cost without adding usable space
• Buy materials directly and hire a day-rate carpenter — can save 15–25% vs a full supply-and-fit package
• Avoid built-in lighting if possible — it adds cost and creates future maintenance headaches
• Time the work for autumn or winter — many deck installers are quieter then and may offer better rates

Decking vs Patio: Which Is Right for Your Garden?

Decking and patios serve similar purposes but suit different situations. Decking is often easier to install over uneven or sloping ground. A patio — whether block paving, slabs, or resin — is typically lower maintenance long-term and may add more value to the property. If your garden is level and you want a low-maintenance surface, a patio is often the better investment. If you have a slope, a raised deck, or a strong preference for the look of timber, decking may be the right call. For a full comparison of patio costs, see our guide to patio costs in the UK.

Finding a Decking Installer

Decking work ranges enormously in quality. Ask to see examples of previous projects and check online reviews before hiring. A good installer will advise on the correct joist spacing for your chosen board type, ensure adequate ventilation beneath the deck to prevent rot, and use stainless steel or galvanised fixings throughout.

Platforms like Checkatrade and Rated People list vetted local contractors with verified reviews and can help you collect multiple quotes quickly.