Is pressure washing safe for all surfaces?

No, and this is important. High-pressure washing — anything over 150 bar — can damage older brick, natural stone, and render. It drives water into mortar joints and can cause serious damp problems. Modern concrete, block paving, and composite materials handle it fine. Softer washing (using lower pressure with chemical cleaners) is safer for delicate surfaces but takes longer and costs a bit more. A good contractor will assess your specific surfaces and recommend the right method. If they just say "I'll pressure wash everything," they're not the one to hire. Ask what pressure (measured in bar or PSI) they'll use. Below 100 bar is generally safe for most masonry; 150+ bar is for tough concrete only.

How often should I have my exterior cleaned?

It depends on your location, property age, and which surfaces. In Newport's damp climate, most homeowners benefit from a full exterior clean every 12-18 months. North-facing walls and roofs get moss and algae faster — sometimes annually. South-facing, sheltered walls might go 2+ years. Driveways accumulate dirt faster if you park on them daily; patios less so if they're under cover. After a professional clean, a light rinse with a hose every few months keeps things fresher longer. Some traders offer maintenance plans where they return quarterly or biannually. This is worth considering if your property's in a bad spot for growth. The longer grime sits, the harder and more expensive it is to remove — so regular cleaning is cheaper long-term than letting it build up.

What's the difference between cleaning and treating moss?

Cleaning removes the moss that's already there. It's the visible job — pressure washing it off or scrubbing it away. Treatment uses a biocide (moss killer) that either prevents regrowth or slows it significantly. A clean alone typically means moss returns within 6-12 months because spores are still present in the mortar or roof surface. A clean plus treatment costs maybe £100-£300 extra but can give you 2-3 years before serious moss returns. In Newport, where moisture is constant, treatment is genuinely worth it. Ask your contractor what they use — it should be environmentally approved for outdoor use. After treatment, they might recommend a follow-up clean 2-4 weeks later once the moss has died and loosened. Some traders include this in the price; others charge separately. Clarify this before you hire.

Do I need to be home while the work's happening?

Not necessarily, but it's sensible to do a walkround with the contractor before they start to confirm which areas need work and agree on the approach. Once they've started, you don't need to hover. Most exterior cleaning is straightforward and doesn't need constant supervision. However, be available by phone in case they find damage (like rotting gutters or cracked render) and need your decision on repairs. For roof work or high-level access, the site should be cleared of people below for safety. Some contractors will ask you to move parked cars or park elsewhere for the day. Agree this in advance. If you're not home, make sure gates are unlocked or provide access beforehand. A good contractor respects your property — they'll put down protective coverings, be tidy, and leave your garden as they found it.

What should I do after the cleaning is finished?

Not much, but a few things help. If they've applied moss treatment, keep off newly treated surfaces for 24-48 hours if possible — the biocide works better when it's not washed off by rain or walked on. Any sealant they've applied needs the same drying time. After that, your property should be maintenance-free for a while. Some traders recommend a light rinse with a hose every few months to shift loose dust and slow regrowth, but it's optional. If you notice repairs they've recommended (like repointing mortar or fixing gutters) don't rush into the first quote you get — shop around. Keep any paperwork, guarantees, or warranties they've given you. If moss or algae comes back faster than promised, contact them. A reputable trader will stand behind their work. Take photos of the finished job from the same angles as before — it's great for your records and helps with future claims if you ever sell.

Newport exterior cleaning 2026

What exterior cleaning covers and why it matters

Exterior cleaning isn't just about making your house look nice — though it does. It's about protecting your investment. Dirt, algae, moss, and grime build up on walls, roofs, driveways, and patios over time. Left alone, they can cause real damage: moss traps moisture against brickwork, leading to dampness; algae staining gets harder to shift the longer it sits; and slippery surfaces become a safety hazard.

A professional exterior cleaning usually covers:

Driveway and patio cleaning using pressure washing or softer methods depending on the surface
Facade and brickwork cleaning to remove algae, lichen, and general grime
Roof cleaning where moss and debris accumulate, particularly in Wales where moisture is high
Gutter and fascia cleaning to keep water flowing properly
Window cleaning as part of a wider job

The key thing is knowing which method suits which surface. High-pressure washing is brilliant for concrete driveways but can damage older brick or natural stone. That's why hiring someone who knows what they're doing matters.

In Newport, the climate — damp, often rainy — means exterior surfaces get filthy faster than in drier parts of the UK. A good clean every 12-18 months is realistic for most homes. If you've got a south-facing wall or an older property with porous brickwork, you might need it more often.

What exterior cleaning costs in 2026

Pricing varies based on what you're cleaning and how dirty it is. Here's what you should expect to pay in early 2026:

Driveway and patio cleaning Small patio (under 50 sq m): £150-£300 Large driveway (100-150 sq m): £300-£600 Pressure washing is generally the cheapest option, but softer methods for delicate surfaces cost a bit more.

Facade and brickwork cleaning Small terraced house: £400-£800 Larger detached property: £800-£1,500 This depends heavily on how many storeys, whether you need scaffolding, and the condition of the brick.

Roof cleaning £500-£1,200 depending on pitch, accessibility, and whether moss treatment is included. This often needs specialist equipment and insurance, which pushes the price up.

Gutter cleaning £150-£300 for a typical semi or detached. More if you need the roof raked or gutters unblocked.

Window cleaning As a standalone job: £100-£250 per visit, often done monthly or quarterly. As part of a larger clean: usually included or discounted.

Combination packages Many traders offer "full exterior clean" deals: driveway, patio, facade, and gutters together. You might pay £1,200-£2,500 depending on property size and condition.

Always get at least two quotes. Ask whether the price includes any treatments (like moss killer or sealant) and whether follow-up visits are included. Some traders charge separately for gutter clearing if it's heavily blocked.

What to look for in accreditations

Not every exterior cleaning job needs formal accreditation, but the right credentials show a trader is insured, trained, and operating to industry standards.

TrustMark: The government-backed scheme. If a trader is TrustMark-registered for external cleaning or property maintenance, they've been vetted for insurance, qualifications, and trading standards compliance. It's a solid sign.

CHAS (Contractor Health & Safety Assessment Scheme): Shows they've been assessed on health and safety. Important if they're doing roof work or working at height.

FMCA (Fenestration, Maintenance and Allied Trades Association): Relevant for window and facade cleaning specialists. They set standards for safe working at height.

ISO 9001 or similar quality management certification: Indicates they follow consistent processes. Not essential, but it shows professionalism.

Public liability and employer's liability insurance: Not an accreditation, but absolutely essential. Ask to see proof. Minimum £1 million public liability is standard; £6 million if they're working at height on scaffolding.

Pressure Equipment Directive (PED) certification: If they use pressure washers above a certain power threshold, they should be compliant. This is technical but shows they know regulations.

Honestly, TrustMark or CHAS is the gold standard. Many smaller local traders won't have these but will have solid insurance and references. Ask for proof of both before you hire. A trader who can't show insurance documents is a red flag — even if they're cheaper.

Newport-specific factors that affect your exterior

Newport's housing stock is mixed: Victorian and Edwardian terraces, 1930s semis, and modern estates. This matters because different properties need different cleaning approaches.

The terraced properties common in central Newport — many built with softer brick and lime mortar — need gentler cleaning methods than modern concrete-rendered homes. Pressure washing the original brickwork on a 100-year-old terrace can actually damage the mortar and let water in. You need someone who understands period properties.

Newport's location in South Wales, close to the Severn Estuary, means higher moisture levels year-round. That salt-laden air encourages algae and moss faster than inland areas. Your roof, gutters, and north-facing walls will get green or black staining quicker. This also means you'll benefit from moss treatments or biocides that slow regrowth — the extra cost pays for itself.

The town's industrial heritage — proximity to the Docks and former steel works — means some properties have picked up industrial fallout over decades. This greasy, stubborn grime often needs different cleaning chemistry than standard algae or weathering. A trader familiar with Newport's specific conditions will know how to handle it.

Roads and pavements in Newport can be quite steep in some areas (like Stow Hill). If your driveway or patio slopes significantly, drainage and water control during cleaning becomes important. You need someone who'll manage runoff properly and not flood your neighbour's garden.

Local drainage into the Usk and Severn means environmental regulations are tighter. Any cleaner worth their salt will use biodegradable products where possible and manage wastewater responsibly. Ask about this — it's not just regulatory compliance, it's about being a good neighbour.

How to find and hire an exterior cleaner

Start by asking for recommendations locally. Neighbours, friends, and local Facebook groups are goldmines for honest feedback. Someone who cleaned three houses on your street has proven themselves in your specific environment.

Use BestTrades.wales to find registered traders in Newport. The directory lists businesses by trade, so you can see who specialises in exterior cleaning and check their details.

When you've got a shortlist of 3-4 traders:

Get written quotes. Email photos of the areas needing cleaning. A proper quote should itemise what they're cleaning, the method (pressure wash, softer clean, chemical treatment), what's included, timescale, and price. Be wary of vague quotes like "full clean — £1,500 ono."

Check insurance. Ask for proof of public liability cover. It should be current and in writing. Don't accept verbal promises.

Ask for references. A local trader should happily give you contact details of 2-3 recent customers. Ring them. Ask if the job was done on time, within budget, and to standard.

Verify TrustMark or CHAS status if they claim it. You can check online on the official websites.

Discuss what happens if you're not happy. Will they return to fix issues? Is there a warranty on moss treatment or sealant? Get this in writing.

Agree payment terms. Typically, 50% upfront and 50% on completion is standard. Don't pay everything before the work is done.

Get a contract or signed quote. Even a simple email confirming dates, work, and price is protection for both of you.

Eight questions to ask before hiring

1. What method will you use on my brickwork/driveway? Don't accept vague answers. They should explain whether they're using pressure washing, softer wash, or chemical treatment — and why it's right for your surface.

2. Do you have public liability insurance? Non-negotiable. Ask for proof. Minimum £1 million; £6 million if working at height.

3. Are you registered with TrustMark or CHAS? Not essential but a strong indicator of standards. If they say yes, verify it.

4. What's included in your price, and what costs extra? Some traders charge separately for gutter clearance, moss treatment, or sealant. Get clarity upfront.

5. How long will the job take, and what happens if weather delays it? Rain or wind might stop work. Understand what "completion" looks like for payment purposes.

6. Do you treat moss or algae to prevent regrowth, or just clean it? A quick clean without treatment means the algae returns in 6-12 months. Treatment costs more but lasts longer. Know what you're paying for.

7. Can you provide references from local customers? Someone local who's had similar work done is worth their weight in gold. Actually call them.

8. What's your cancellation or rescheduling policy? Life happens. Know where you stand if you need to postpone or if they cancel.

Newport exterior cleaning — the complete homeowner guide (2026)