Build your whole deck around our walnut boards here. The calculator walks you through each part, from subframe and joists to clips, starter clips, fascia and edging trims. Enter your length and width in metres and skip any step for parts you already have. People who ask us about walnut want the closest thing to real timber, and they usually compare it with our ipe and light oak boards. All three use a mixed-colour wood grain to get a true wood look, so review them side by side and order samples before you commit — the relaxed, earthy brown needs to be right in your garden, not just on screen.
Walnut Composite Decking Board
- Type: Wood Fibre & HDPE Plastic.
Size:
How Many Walnut Boards Do You Need?
Quick Board Calculator
Just need to know how many walnut boards your project takes? Enter your length and width to get an instant board count and cost estimate for your area.
Calculate Boards Only ↓Full Project Calculator
It’s easy to overlook hidden clips, starter clips, edging trims or joists. Build your full project around our walnut boards, step by step, and skip anything you don’t need.
Build Full Project ↓Total
£ 23.39
Quantity
Bring nature’s depth and warmth into your garden with our Walnut Decking Board from the Exclusive Natural Collection. Each board blends rich walnut tones with a realistic woodgrain texture for a finish that looks just-milled but requires none of the upkeep.
Built from premium composite material, it’s reversible, with a choice of rustic woodgrain or modern grooves for added grip. Slip- and fade-resistant, this board is made for barefoot mornings and family barbecues—moments that matter on decking made to last. For more design inspiration and to see all available finishes, explore our entire contemporary composite decking collection.
Please Note: Order Your Free Samples
We highly recommend ordering our free samples to confirm the colours before placing an order, as digital photos can vary significantly between screens.
Authentic Dual Sides
Exclusive Natural Design
Rich Walnut Finish
Expert Advice On Our Walnut Composite Decking
Want to know more? Our in-house expert, Allan, gives his take on our Walnut Composite Decking, and we’ve selected some of our best guides to help you decide if this is the right choice for you.
A Word from Our Expert, Allan Jeffrey BSc. Eng. (Hons), Composite Materials Specialist, Environmentalist, and CEO of Ultra Decking:
Walnut is the board people stop and touch. We blend lighter and darker browns through every length rather than settling on one shade, so the surface has the streaks and shifts you’d find in a plank of real walnut, and no two boards are quite the same. That variation is what gives a finished deck the look of an exotic hardwood rather than a composite trying to pass for one.
The feedback we get on it says more than I can: customers tell us it looks exactly like natural wood, and more than once a visitor has had to be told it isn’t. If you want the warmth and depth of a dark timber deck with none of the oiling, sanding or splinters, this is the one I’d point you to.
Key Benefits of Our Walnut Boards
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Authentic Walnut Appearance
Our most realistic wood-grain effect uses multi-tonal colouring to perfectly replicate the rich, deep charm of natural walnut timber.
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Walnut Finish
A rich, mixed-tone colourway inspired by exotic hardwood, ideal for pairing with both earthy neutrals and bolder landscape designs.
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Sustainable Design
Manufactured using recycled materials, offering an eco-friendly alternative to timber without compromising style or strength.
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DIY-Friendly
Lightweight and easy to fit with our hidden fastening system, making it a smart solution for first-time fitters and seasoned pros alike.
Walnut Decking Board Specifications
Check the Walnut Decking board’s dimensions below before you measure up, so steps, borders and any features in your design work out exactly. If you’re working the boards out by hand rather than with our calculator, An expert tip is: allow for the gap between boards: a 148 mm board needs a 3 mm side gap, so count each board as 148 + 3 mm across.
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Length
3600mm
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Width
148mm
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Board Coverage
0.533m²
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Finish
Mixed Colours, Wood Grain
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Thickness
25mm
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Colour
Brown | Chocolate | Walnut
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Installation
Grooved (requires decking clips)
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Weight (per board)
Approx. 9kg
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Material
High-Density Polyethylene & Wood Fibre Composite
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Warranty
15 Years Residential
Quick Calculator: How Many Walnut Boards Do You Need?
You may already have your build planned out. If so, our quick calculator works out just the boards you need, with recommended accessories like our trims listed below so you can add them if needed. Customers choosing walnut are buying it for the brown, so the accessories should disappear into it. Use our slim decking clips, which leave no fixings on show, and finish the edges with our chocolate trims — a shade off the boards, enough to define the edge without breaking the colour.
Area
0 m²
Required Boards:
0
Recommended Products
Composite Joists – Size: 3m x 100mm x 50mm
C24 Timber Floor Joist 47mm x 100mm x 3.6m
Composite Posts
Timber Posts Treated 100mm x 100mm
Slim Hidden Fasteners – Decking Clips
Plastic Decking Fasteners
Ultra Composite Decking Clip
Full Project Calculator: Every Material and Accessory for Your Walnut Deck
Calculate
What Are the Delivery Options for Walnut Decking?
Delivery options and times for waknut decking boards are below. Free delivery is on our own vans, with orders grouped by area, and is estimated at 5 to 7 working days. Urgent delivery is £79.99 and estimated at 1 to 4 working days. Clips, trims and other small items are delivered with your boards, and you can collect from our warehouse free of charge. If you won’t be in on the day, tell us where the boards can be left; otherwise a redelivery may be needed.
| Delivery Type | How Long? | Delivery Cost |
|---|---|---|
| Urgent | Estimated 1-4 Working Days | £79.99 |
| Normal* | Estimated 5 to 7 Working Days* | FREE |
| Royal Mail Standard (Small Parcels) | 3–5 Working Days | £8.00 |
| Royal Mail Standard (Large Parcels) | 3–5 Working Days | £29.95 |
| Collection | Collection from our warehouse | FREE |
| Sample Packs | 3–5 Working Days | FREE |
| *Normal | Distance Deliveries Can Exceed Estimate | FREE |
FAQ About Our Walnut Boards
1 Will the walnut boards fade in sunlight?
Some fading is natural with all composite products, up to around 20% on this shade. Our enhanced surface treatment increases UV resistance, so the change is gradual and settles into an aged timber finish rather than a bleached one.
2 Can I install this wood grain decking myself?
Yes. With a grooved edge that works with hidden fasteners, these boards are designed for straightforward installation. No specialist tools or trades are required; our installation guide walks through each step.
3 Are the boards slippery when wet?
No. Our Exclusive Collection has enhanced slip resistance, even in rainy conditions. Whether you’re barefoot or in boots, the deck stays safe underfoot.
4 How do I choose between the two sides?
It’s up to you. The reversible board offers a woodgrain finish for a natural, rustic look and a grooved side for a modern, linear one. You can also mix the two in your layout for added interest.
5 How many walnut boards will I need?
Use the quick calculator on this page: enter your deck’s length and width for a board count, and tick the 5% cutting margin to cover trimming and cuts. Each 3.6m board covers roughly 0.533 m²; if you’re working it out by hand, this board is 148mm wide, so count each one as 151mm across with its 3mm gap.
6 Is this decking eco-friendly?
Yes. Our composite boards are made from a blend of recycled wood fibres and plastic, reducing demand for new timber and lowering your environmental footprint.
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