Is pressure washing safe for all surfaces?

No, and this is crucial. High-pressure jets (over 150 bar) can damage soft materials like render, lime mortar, and some brick. They can also force water behind flashings and under roof tiles, causing leaks. Pressure washing works well on concrete, modern brick, and sealed stone, but softer or older surfaces need a gentler touch. A good trader assesses the surface first and may recommend soft washing (lower pressure, with chemical treatment) instead. Always ask what method they'll use and why before agreeing to the job.

How often should I get my gutters cleaned?

Most Cardiff homes benefit from gutter cleaning at least twice a year — spring (April–May) and autumn (September–October). If you're surrounded by trees or have a slate roof that sheds debris, you might need it three times a year. Blocked gutters lead to water overflow, which damages fascias, soffits, and the walls below. It's one of the most common sources of damp in older properties. If you notice water spilling over the sides during rain, or you see moss and algae growth, that's a sign gutters need clearing. Some traders offer quarterly contracts, which spreads the cost and keeps your gutters consistently clear.

What's the difference between soft washing and pressure washing?

Pressure washing uses high-velocity water jets (usually 150–250 bar) to blast away dirt, grime, and sometimes moss. It's fast and effective on tough surfaces but can damage delicate materials. Soft washing uses lower pressure (under 100 bar) combined with biodegradable chemical cleaners. It takes longer but is gentler and often more effective at killing algae and moss at the root, preventing regrowth for longer. For Cardiff's older housing stock with render, lime mortar, or slate, soft washing is often the better choice. It costs slightly more but prevents damage and lasts longer. Ask which method suits your specific surfaces.

Can exterior cleaning prevent damp problems?

It can help but isn't a cure-all. Regular gutter cleaning prevents water overflow that leads to damp in walls. Cleaning render and brickwork removes moss and algae that trap moisture. However, if damp is caused by rising damp from soil, missing damp-proof course, or structural cracks, cleaning alone won't fix it. That requires professional damp assessment. Exterior cleaning is part of good maintenance — it removes water from where it shouldn't be and prevents small problems becoming big ones. If you have persistent damp, get a damp specialist to diagnose it properly before assuming cleaning will solve it.

Should I seal my driveway after cleaning?

It's a good investment, especially in Cardiff's wet climate. Sealing protects concrete and block paving from water ingress, weathering, and staining. Unsealed driveways deteriorate faster and become slippery in wet weather. Cost is typically £200–£400 for a typical driveway, applied after cleaning. The sealant lasts 2–5 years depending on traffic and weather. Some traders include sealing in their quote; others offer it as an add-on. If your driveway is heavily stained or over 10 years old, sealing after cleaning is sensible. For newer or lightly soiled driveways, it's optional but worthwhile if budget allows.

Cardiff exterior cleaning 2026

What exterior cleaning covers and why it matters

Exterior cleaning isn't just about making your house look nice — though that's part of it. It's about protecting your investment. Over time, dirt, algae, moss, and weathering damage the surfaces of your home. Your driveway gets slippery and dangerous. Gutters clog and stop draining properly. Fascias and soffits rot because water isn't running away cleanly. Windows become hard to see through. All of this can lead to costly repairs if left unchecked.

Exterior cleaning services in Cardiff typically cover several areas: pressure washing driveways and patios, cleaning roof surfaces, clearing gutters and downpipes, washing windows and frames, and cleaning rendered or brick walls. Some traders offer softer wash methods for delicate surfaces like conservatory roofs or rendered finishes. Others specialise in high-access work using cherry pickers or rope access for tall buildings.

The key is choosing the right method for each surface. Pressure washing works well on concrete and brick, but blast a soft render with high pressure and you'll damage it. A good trader knows the difference and won't push a one-size-fits-all approach. They'll assess what your home needs and recommend the safest, most effective clean. That's what separates the competent operators from the cowboys.

Before you hire anyone, walk around your property and note what needs cleaning. Is it algae or just dirt? Are gutters blocked? Is the driveway slippery? This information helps traders quote accurately and shows you're serious about the work.

How much exterior cleaning costs in Cardiff

Pricing varies widely depending on what you need and the size of your property. Here's what you can realistically expect in 2026:

Driveway and patio cleaning: £150–£400 for a typical semi-detached house. Larger driveways, multiple patios, or heavily stained surfaces push into the £400–£600 range. If you need sealing after the clean, add £200–£400.

Gutter cleaning and clearing: £80–£200 for a straightforward job on a two-storey semi. If gutters are heavily blocked, leaves are thick, or access is tricky, expect £200–£350. Some traders charge per metre of guttering instead.

Roof wash or moss removal: £300–£700 depending on pitch, size, and coverage. Delicate or sloped roofs cost more because access and safety equipment are needed. Terraced roofs in Cardiff's Victorian and Edwardian stock can run towards the upper end.

Window cleaning: £80–£150 for a typical semi. Regular cleaning contracts (monthly or quarterly) often cost £40–£80 per visit.

Full exterior package: If you're getting your driveway done, gutters cleared, roof treated, and windows cleaned all at once, expect £800–£1,800 depending on property size and condition.

Factors that increase cost: difficult access, multiple storeys, heavy contamination, specialist equipment needed (cherry picker, water-fed poles), and post-treatment sealing or protective coatings.

Always get three quotes. Cheapest isn't best — a trader undercutting by hundreds of pounds may cut corners on safety or quality. Mid-range quotes from established traders usually offer the best value.

Accreditations and standards to look for

When you're vetting exterior cleaning traders, check for these recognised accreditations. They show the trader has met proper standards and carries insurance.

TrustMark: This is the government-backed quality scheme you should prioritise. TrustMark traders are vetted, insured, and must follow a code of conduct. If something goes wrong, there's a dispute resolution process. Ask for the trader's TrustMark number and verify it on the TrustMark website — it takes 30 seconds.

CHAS and Safe Contractor: These are health and safety vetting schemes. They don't replace TrustMark but show the trader takes safety seriously, especially relevant for high-access work like roof cleaning or gutter work from ladders.

Industry bodies: Some exterior cleaning traders belong to the British Academy of Pressure Cleaning (BAPC) or similar trade associations. Membership suggests they've trained properly and follow industry best practice. It's not a guarantee, but it's a good sign.

Public Liability Insurance: At minimum, the trader must have public liability cover (£1–£10 million). If they damage your property or a neighbour's during the work, this covers it. Always ask to see proof before work starts.

Water quality certification: If they're using a water-fed system (common for window cleaning), some traders carry certification showing they understand water quality and environmental regulations.

Don't assume accreditations mean higher prices. Many honest, skilled traders are TrustMark registered and competitive on cost. If a trader has none of these and can't explain why, or gets defensive when asked, that's a red flag. A professional trader expects these questions.

Why Cardiff homes need regular exterior cleaning

Cardiff's climate and housing stock make regular exterior cleaning practical, not just cosmetic. The city gets plenty of rain, high humidity, and damp — perfect conditions for moss, algae, and mould growth. If you've got a north-facing roof or walls shaded by trees, you'll see green growth faster than someone in a sunnier town.

Much of Cardiff's housing stock is Victorian and Edwardian terraces and semis. These older properties have lime mortar, soft brick, and render that respond badly to high-pressure washing. You need a trader who understands these materials and uses softer wash methods. The Welsh Slate roofs common in Cardiff need careful handling too. Blast one with pressure and you'll push water under the slates. A knowledgeable local trader will know this.

Cardiff's location also matters. Proximity to the Bay and the Taff means salt spray can accelerate weathering and corrosion on metal gutters and downpipes. That's why regular cleaning isn't optional for homes near the water. Further inland in areas like Llanishen or Cathays, it's less of an issue, but algae and moss still thrive.

The city's tree-lined streets are beautiful but a nightmare for gutters. Leaves, seeds, and debris clog gutters constantly. Winter and spring are the worst months. Regular clearing — at least twice a year — keeps water running freely and prevents damage to fascias and soffits.

If you're hiring a trader, pick someone familiar with Cardiff properties. They'll know about the lime mortar, soft stone, and slate. They'll have the right equipment and methods for local conditions. A trader who's worked across South Wales understands what your home needs.

How to find and hire an exterior cleaning trader

Start by asking neighbours and friends for recommendations. They'll tell you honestly whether someone was reliable and did good work. Word of mouth is the strongest signal in trades.

Use BestTrades Wales to search for exterior cleaning traders in Cardiff. Filter by location, check accreditations, and read feedback from other homeowners. The directory shows you which traders are verified and what others have experienced with them.

Getting quotes: Contact at least three traders. When you do, give them the same information. Describe the work clearly: 'Three-bed semi, driveway, patio, gutters, and windows.' Include photos if possible. A trader who asks detailed questions before quoting is taking it seriously.

What to ask in the quote: It should include what's being cleaned, the method used, any treatments applied afterward, timeline, and total cost. Watch out for quotes that are vague or don't specify what's included.

Check before committing: Ask for proof of insurance, verify accreditations (TrustMark number, etc.), and ask for recent references. A confident trader will happily provide these. Request a contract or written agreement — no verbal promises. It should outline the work scope, cost, payment terms, and start/end dates.

Payment terms: Reputable traders typically ask for a deposit (25–50%) when you agree, with the balance due on completion or shortly after. Don't pay the full amount upfront. If a trader insists on 100% payment before work starts, that's a risk.

Insurance and guarantees: Confirm they carry public liability insurance and ask if there's a guarantee on the work (many offer 6–12 months, meaning if growth returns quickly, they'll retreat it at no charge).

Once work is complete, take photos for your records. If you're unhappy, raise it immediately while the trader can make it right.

Questions to ask before hiring

Here are the specific questions that separate competent traders from the rest:

1. What method will you use for my driveway/patio/roof? Listen carefully. If they say 'pressure wash everything' without asking about surface type, be wary. They should ask about material, condition, and age before recommending a method. Soft wash, pressure wash, and chemical treatment all have their place.

2. Are you TrustMark registered? Can you provide your number? Ask and verify it on the TrustMark website. This is the single biggest proof of legitimacy.

3. Can you show me proof of public liability insurance? They should produce a certificate without fuss. Minimum £1 million cover, but £6–10 million is better. Check the certificate hasn't expired.

4. What happens if the growth comes back within three months? A confident trader will offer to retreat the area at no extra cost or reduced cost. This shows they stand by their work.

5. Do you use filtered/deionised water for window cleaning? If they say yes, they understand water-fed systems and won't leave streaks or mineral deposits on your windows. If they're unclear or dismissive, they may be using tap water.

6. How long have you been doing this, and do you have recent references? Experience matters. Ask for two or three references from work done in the last 12 months, ideally in Cardiff.

7. Will you access my gutters from a ladder or do you use a gutter vac? Gutter vacs are safer and cleaner. Some traders still use ladders and hand-clearing. Both work, but understand the method.

8. What's included in the price, and what's extra? Get specifics. Is sealing included? Do they remove moss with a biocide first, or just wash? Are fences, walls, or other features included? A clear scope prevents surprises later.

If a trader gets defensive or evasive about any of these, move on. Transparent traders welcome scrutiny.

Cardiff exterior cleaning — the complete homeowner guide (2026)