Decking Cleaning in Norwich: Costs, Methods & Restoration

Decking is brilliant when it's clean — a warm, inviting extension of your living space into the garden. But after a year or two of Norfolk weather, most decking turns into a grey, algae-coated slip hazard that nobody wants to walk on barefoot. This guide covers everything you need to know about decking cleaning in Norwich and Norfolk: what it costs, the best cleaning methods for different deck types, and how to protect your investment year-round.

Why Decking Gets So Dirty in Norfolk

Norfolk's combination of moisture, mild temperatures, and tree cover creates ideal conditions for algae and moss growth on timber surfaces. Wooden decking is particularly vulnerable because it's horizontal (water sits on it), textured (algae clings to the grain), and often shaded by the house or garden boundaries.

The result? Within 12–18 months of installation, most untreated softwood decking in Norwich develops a green biofilm that makes it dangerously slippery when wet. This isn't a sign of bad decking — it's just what happens to wood in our climate. The question isn't whether your deck will need cleaning, but how often and by what method.

Beyond algae, decking also suffers from UV greying (the timber loses its colour and turns silver), tannin staining (brown streaks from oak leaves or metal fixings), and general ground-in dirt from foot traffic, barbecues, and garden debris. A proper clean addresses all of these.

How Much Does Decking Cleaning Cost in Norwich?

Professional decking cleaning services in Norwich and Norfolk charge based on the deck area and whether you want additional treatment (oiling, staining, or anti-slip coating) after cleaning:

• Small deck (up to 15m²): £100–£180
• Medium deck (15–30m²): £180–£280
• Large deck (30m²+): £280–£400+
• Decking oil/stain application (additional): £4–£8 per m²
• Anti-slip treatment (additional): £3–£5 per m²

These prices typically include a chemical pre-treatment, pressure washing, and a thorough rinse. The clean alone transforms the look — but adding oil or stain afterwards is what makes the results last. Think of cleaning as restoring the surface and oiling as protecting it.

Cleaning Methods: What Actually Works

Pressure Washing (with care)

Pressure washing is the most effective method for removing ground-in grime and algae from decking — but it needs to be done carefully. Too much pressure, and you'll gouge the wood grain, splinter the surface, and create a rough texture that actually holds more dirt and algae than before.

For softwood decking (pine, spruce — the most common in Norwich), use under 1,500 PSI with a fan nozzle (25° or 40°). Keep the nozzle at least 20cm from the surface and always work along the grain, never across it. A rotary surface cleaner attachment is ideal — it distributes the pressure evenly and prevents the striping effect you get from a handheld lance.

Hardwood decking (oak, ipe, cumaru) is denser and can tolerate slightly more pressure, but the same principles apply — work with the grain and let the chemical pre-treatment do the heavy lifting rather than relying on pressure alone.

Chemical Pre-Treatment

This is the step that separates a mediocre clean from a professional result. A specialist deck cleaner — typically an oxygen-based or alkaline formula — is applied to the decking and left to dwell for 15–30 minutes. It breaks down algae, kills moss at the root, and lifts stains from the wood surface. By the time you pressure wash, most of the grime practically rinses off. This means you can use lower pressure, which protects the wood.

Avoid household bleach on wood decking — it's too harsh, strips colour unevenly, and can damage the wood fibres. Purpose-made deck cleaners are formulated to clean without damaging.

Scrubbing (Low-Tech but Effective)

For small decks or areas where pressure washing isn't practical, a stiff brush and a specialist deck cleaning solution can do a surprisingly good job. It takes longer — expect a full afternoon for a medium deck — but you eliminate the risk of pressure damage entirely. This approach works well for composite decking, which doesn't respond well to high-pressure water.

Wooden vs Composite Decking: Different Approaches

Wooden Decking

Most decking in Norwich is softwood — typically pressure-treated pine. It's affordable and looks great when maintained, but it needs annual cleaning and treatment to stay that way. After pressure washing, allow the wood to dry completely (48–72 hours in good weather), then apply a decking oil or stain. Oil feeds the wood, prevents drying and cracking, and restores the warm colour that UV exposure strips away. Stain adds both colour and a protective layer.

Popular oil colours for Norwich gardens include natural cedar, medium oak, and dark teak — though clear oil is also an option if you like the silvered look but want UV protection.

Composite Decking

Composite decking (Millboard, Trex, Cladco) is marketed as "low maintenance" — and it is, compared to wood. But it still needs cleaning. Algae grows on composite just as readily as on timber, especially in shaded areas. The good news: composite doesn't need oiling or staining. Clean it with a soft brush, mild detergent, and a low-pressure rinse (under 1,200 PSI), and it'll look like new. Avoid abrasive cleaners or stiff wire brushes, which can scratch the surface.

DIY vs Professional Decking Cleaning

DIY Can Work If...

• You have a small deck (under 10m²)
• It's composite or hardwood (more forgiving surfaces)
• You're comfortable with a pressure washer and know the right settings
• You're prepared to spend a full day on it (cleaning + drying + oiling)

Go Professional When...

• Softwood decking — the margin between "clean" and "damaged" is narrow with consumer machines
• Heavy algae — needs proper chemical pre-treatment, not just pressure
• You want oiling/staining too — professionals apply it evenly and quickly; DIY application often leaves lap marks and pooling
• Large deck — a 25m² deck takes a professional 3–4 hours including oiling; DIY takes a full weekend
• Elevated or multi-level decks — access and safety considerations make these a job for professionals

How to Keep Your Deck Clean Longer

• Oil annually. Decking oil is the single most effective thing you can do. It prevents algae taking hold, stops UV greying, and keeps the wood supple. Apply in spring after cleaning.
• Sweep regularly. Leaves and debris that sit on the deck decompose and create a damp, nutrient-rich layer — perfect for algae. A weekly sweep prevents this. In autumn, combine with a leaf removal service if your deck is under trees.
• Improve airflow. If your deck is enclosed on multiple sides, airflow underneath and across the surface is restricted, keeping it damp longer. Trimming back hedges or shrubs near the deck improves drying.
• Move furniture periodically. Planters, furniture legs, and BBQs create damp patches underneath where algae thrives. Move them occasionally to let the wood dry.
• Treat spots early. If you see a green patch forming, hit it with diluted deck cleaner and a brush. Five minutes of spot-cleaning saves a full pressure wash later.

When to Book Decking Cleaning

March to May is the sweet spot — you clean off the winter grime, oil the wood while it's dry, and have a pristine deck ready for the first warm weekend. GreenRun's pressure washing service covers decking across Norwich and Norfolk, with fixed pricing and professional aftercare.

Whether you're restoring a neglected softwood deck in Hellesdon, refreshing composite decking in Hethersett, or maintaining a hardwood entertaining area in Golden Triangle — a proper annual clean and treatment keeps your decking safe, attractive, and long-lasting. Neglect it, and you're looking at a replacement bill of £50–£100 per m² instead of a cleaning bill of £6–£10 per m². The maths is obvious.