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

Garden decking is one of the most popular ways to create outdoor living space in the UK. It works on sloped gardens where a level patio would be impossible, raises the entertaining area to a more comfortable height, and can be built around obstacles like trees or existing features.

Decking costs vary significantly depending on the material, size, and complexity of the build. This guide explains all the main cost factors for 2026.

Average Decking Costs in the UK

For a standard deck of around 15-20 square metres:

• Pressure-treated softwood (pine): £1,800 – £3,500 (supply and install)
• Hardwood (Ipe, Bangkirai): £3,000 – £6,000
• Composite decking: £3,500 – £7,000
• PVC/plastic decking: £2,500 – £5,000

Decking Material Costs Per m2

Softwood decking boards (treated pine):

• Supply only: £15 – £30 per m2
• Supply and fit: £80 – £130 per m2

Hardwood decking boards (Ipe, Cumaru, Bangkirai):

• Supply only: £40 – £100 per m2
• Supply and fit: £130 – £200 per m2

Composite decking (TimberTech, Trex, Millboard):

• Supply only: £50 – £130 per m2
• Supply and fit: £120 – £220 per m2

What Affects Decking Costs?

Height and Structure

Ground-level decks (under 300mm above ground) are straightforward and use less timber framing. Raised decks require a more substantial subframe, potentially concrete footings or screw piles, and may need more complex construction. A raised deck 600-900mm above ground can cost 30-50% more than an equivalent ground-level deck.

Complexity and Shape

Simple rectangular decks are the cheapest to build. Decks with multiple levels, curves, built-in seating, planters, or steps add significant labour time and cost. Built-in seating typically adds £300 – £800. Steps cost £150 – £400 each depending on width and construction.

Material Quality

Pressure-treated softwood is the most affordable option but requires staining or oiling annually and has a 15-20 year lifespan with maintenance. Hardwood decking lasts 25-30 years with less maintenance but costs 50-100% more. Composite decking has the lowest ongoing maintenance cost typically just annual cleaning and a lifespan of 25-30 years, but the highest upfront cost.

Decking Fascia and Finishing

Fascia boards to finish the edges of the deck add a professional look and conceal the structure. Budget £200 – £600 for fascias depending on deck perimeter length.

Labour Costs for Decking Installation

Labour typically makes up 40-55% of the total decking cost.

• Day rate (experienced carpenter/decking fitter): £200 – £350 per day
• Standard 15m2 softwood deck: 3-5 days labour = £800 – £1,750
• Standard 15m2 composite deck: 4-6 days labour = £1,000 – £2,100

Composite and hardwood decking generally take longer to install because of more precise cutting requirements and hidden fastener systems.

Planning Permission for Decking

Decking under 300mm in height and covering less than 50% of the total garden area generally falls under permitted development in England. However:

• Decking over 300mm high typically requires planning permission
• Properties in conservation areas may have restrictions on any decking
• Listed buildings require listed building consent for external changes

Always check with your local planning authority if in doubt. An enforcement notice to remove unapproved decking is an expensive outcome to avoid.

Ongoing Maintenance Costs

Softwood decking: Annual cleaning (£50-£150 for a 15m2 deck) and oiling or staining every 1-2 years (£100-£300 in materials if DIY). Boards may need replacing after 10-15 years without good maintenance.

Hardwood decking: Annual oiling (£100-£200) to maintain colour. Hardwood will naturally silver to a grey patina if left untreated many owners prefer this look.

Composite decking: Annual cleaning with a decking cleaner or pressure washer (£30-£100). No staining or oiling required. Highest upfront cost but lowest lifetime maintenance cost.

Is Composite Decking Worth the Extra Cost?

If you plan to stay in your property for 10+ years and want genuinely low maintenance, composite decking delivers. Over 20 years, the lower maintenance cost often offsets the higher upfront price compared to softwood. For a rental property or a home you plan to sell soon, pressure-treated softwood gives a better cost-to-value ratio.

Getting the Best Value on Decking

• Obtain three quotes and check if the quoted spec is like-for-like
• Ask about the timber source and guarantee for composite boards
• Check if footings and fixings are included in the price
• Visit completed installations if possible
• Consider timing late summer and autumn quotes are often more competitive