Short answer
Render cleaning starts from £195 with CPAGM in Chester. Across the UK, cleaning render is usually priced per elevation or per square metre — roughly £4 to £8 per m² soft washed — so a small home is often a few hundred pounds and a large detached house more. Render is soft washed with a biocide, never pressure washed, and house size, access, height and render type drive the price.
What render cleaning costs and why
The honest answer to "how much to clean render" is that it is priced on the wall area, the height and access, and the render type — not just the hours on site. With CPAGM, render cleaning starts from £195, soffit and fascia cleaning from £125, and a full exterior refresh from £295. Because render greens up unevenly and every house is a different size and height, the exact figure is confirmed after you send a few photos rather than guessed over the phone.
As a UK market guide, render cleaning is normally quoted either per elevation (per wall) or per square metre of render, working out at roughly £4 to £8 per m² for a proper soft wash. That means a single stained wall is often £150 to £350, a small terraced or semi-detached house comes in a few hundred pounds, and a large detached property with high or awkward walls sits higher. Modern silicone, K-Rend and painted renders tend to land at the top of any range because they have to be cleaned gently and carefully rather than blasted.
Across Chester, Hoole, Handbridge, Upton and the wider Cheshire and Wirral area there are a lot of rendered and pebbledashed homes, and our damp North West climate is hard on them. North-facing walls that barely see the sun, frontages near the Dee, and anything shaded by trees or hedges green over fast. The green and red film and the black streaking running down from the gutters are living algae and lichen, which is why a rendered wall comes back looking tired within a season or two of a rushed clean that only rinses the surface.
Render & exterior cleaning — CPAGM prices
| Job | Guide price | What affects it |
|---|---|---|
| Render cleaning | From £195 | Render soft washed with a low-pressure biocide; final price set by wall area, height, access and render type |
| Soffit and fascia cleaning | From £125 | Fascias, soffits and bargeboards brought back up — ideal added to a render clean so the whole frontage is done in one visit |
| Full exterior refresh | From £295 | Render plus soffits, fascias and gutters cleaned together for the biggest visual lift in a single visit |
These are our real starting prices for typical Chester and Cheshire homes. Every job is confirmed after you send a few photos or we take a quick look, because the render type, wall area, height, access and level of staining all change the scope. We do not add a charge for the quote itself.
Typical UK render cleaning prices (market guide)
| Job | Guide price | What affects it |
|---|---|---|
| Soft wash by wall area (per m²) | £4–£8/m² | The most common way render cleaning is priced; heavier staining and difficult finishes sit at the top |
| Single elevation / one wall | £150–£350 | One face of the house, priced per elevation — the usual minimum for a soft wash visit |
| Terraced or small semi (all render) | £400–£700 | Whole house soft washed all round, standard two-storey height and reasonable access |
| Larger detached (all render) | £700–£1,500 | Bigger wall area and more elevations; three storeys, tight access or height push it up |
| K-Rend, silicone or coloured render | Top of range | Through-coloured and painted renders need careful low-pressure work, so they are priced towards the higher end |
Clearly-labelled typical UK guide ranges, not a CPAGM quote — render cleaning is usually priced per elevation or per m², and house size, height, access and render type drive the figure. For a firm price on your home, send photos for a real quote from £195.
Why render must be soft washed, not pressure washed
Render is a thin decorative and weatherproofing coat over the wall behind it. A soft wash cleans it the way it is meant to be cleaned: a specialist biocide is applied at very low pressure across the whole elevation, left to break down the algae, lichen and black spotting at the root, then rinsed gently. The chemistry does the work, not the water pressure — which is exactly why the result lasts and why the finish is not marked or stripped.
A pressure washer does the opposite. High-pressure water blasts the surface off render, opens up hairline cracks and drives water into the wall behind, and on silicone, monocouche, K-Rend and painted render it can permanently scar the texture or blow patches clean off. The green also comes straight back, because jetting only rinses the top film and leaves the algae roots alive in the surface. Soft washing costs a little more than a quick blast because it uses a biocide, but it is the only safe method for render and it is the reason the wall stays clean for years rather than months.
There is a safety and damp angle too. If a wall is already cracked, or the render sounds hollow when tapped, forcing water behind it is a fast route to damp inside the house. Part of a proper visit is checking for that and flagging any repair worth doing before cleaning, rather than washing over a problem.
What a professional soft wash render clean involves
- 1
Inspect the render and protect the area
We check the render type and condition, look for cracks or blown or hollow-sounding areas, and protect windows, doors, plants and borders before any treatment goes on.
- 2
Apply a low-pressure soft wash biocide
A specialist biocide is applied at low pressure across the whole wall. It is the treatment that kills the algae, lichen and black spotting at the root — not high-pressure water, which render cannot take.
- 3
Let the treatment work and rinse gently
The biocide is given time to break down the growth, then the render is rinsed off gently. Much of the staining keeps lifting in the weeks afterwards as the dead growth weathers away, so a wall can look better a month on than on the day.
- 4
Check the finish and tidy up
We check the result, flag any cracked or damaged render worth repairing before damp gets in, and leave the area rinsed down and tidy.
Never pressure wash render
A pressure washer will strip the surface off render, force water into the wall behind it, and on silicone, monocouche or K-Rend it can permanently scar the finish or blow it off in patches — a repair that runs into thousands. Render must be soft washed with the right biocide, not jet washed. If a wall is already cracked or the render sounds hollow when tapped, get it looked at before anyone cleans it, because water driven behind failing render causes damp inside the house.
K-Rend, silicone and painted render — why they need extra care
The type of render is the single biggest factor in both method and price. Older sand-and-cement render and traditional pebbledash are relatively forgiving, but modern through-coloured finishes are not. K-Rend and other silicone renders carry their colour all the way through and rely on a water-repellent surface, so blasting them removes exactly the layer you are paying to keep — the colour goes patchy and the wall can start holding water instead of shedding it. Monocouche is similar. Painted render adds another catch: too much pressure lifts the paint film and you turn a clean into a repaint.
This is why "k rend cleaning cost" and "softwash render cleaning cost" are effectively the same question — K-Rend has to be soft washed, and soft washing is what protects it. Through-coloured and painted renders sit at the top of any price range not because they take longer to blast, but because they demand a careful, correctly judged low-pressure treatment that leaves the colour and texture exactly as they were. When you send photos, telling us the render type (K-Rend, silicone, monocouche, pebbledash, painted or older sand-and-cement) lets us price it right first time.
Pressure washing vs professional soft washing for render
| DIY or pressure washing | Professional soft wash | |
|---|---|---|
| Surface safety | High pressure strips and scars render and blows it off in patches | Low-pressure biocide cleans without damaging the finish |
| How long it lasts | Water alone leaves the algae roots, so it greens back within months | Biocide kills growth at the root, so the result lasts far longer |
| Risk to the wall | Forces water behind the render and can cause internal damp | Gentle method keeps water out of the wall build-up |
| K-Rend / silicone / painted | Blasting ruins through-coloured and painted finishes | Correctly judged treatment protects colour and texture |
| Height and reach | Hard and unsafe to reach upper walls on a ladder | Upper elevations reached safely with the right equipment |
| Typical cost | Washer hire plus your day, plus the risk of an expensive repair | From £195, insured, with a finish that holds up |
Why north-facing and coastal walls green over faster
Algae and lichen need damp and shade, and some walls give them both. A north-facing elevation barely sees direct sun, so it dries slowly and stays green year-round, while the sunny south face of the same house can look almost clean. Walls shaded by trees, hedges, a neighbouring building or a narrow passage green up faster too, and anything catching splash-back from a blocked gutter or a downpipe streaks black quickly.
Location matters as much as aspect. In our damp North West climate everything greens faster than the national average, and homes nearer water — frontages by the Dee, or exposed coastal walls out towards Ellesmere Port and the Wirral — take the worst of the wind-driven moisture and salt-laden air. Frodsham, Northwich and Tarporley see plenty of it too. If your render is greening every couple of years, aspect and exposure are usually why, and a soft wash on a sensible cycle keeps on top of it rather than letting the growth get established and harder to shift.
Photos that get you an accurate price fast
- A wide photo of each rendered wall so the total area and number of storeys is clear
- A close-up of the worst staining — green or red algae, black streaks under the gutters, or lichen spotting
- A photo showing the render type if you know it (silicone, K-Rend, monocouche, pebbledash, painted or older sand-and-cement)
- A note on how the sides and rear of the house are accessed — gates, passages, parking and any height issues
Frequently asked questions
How much does render cleaning cost?
Render cleaning starts from £195 with CPAGM in Chester. Across the UK render cleaning is usually priced per elevation or per square metre — roughly £4 to £8 per m² soft washed — so a small home is often a few hundred pounds and a large detached house more. The price depends on the wall area, the height and access, the render type and how much algae has built up.
What are typical render cleaning prices in the UK?
In the UK, render cleaning prices are typically quoted per wall (elevation) or per square metre. As a rough guide expect around £4 to £8 per m² soft washed, roughly £150 to £350 for a single elevation, £400 to £700 for a small semi or terrace, and £700 to £1,500 for a whole large detached house depending on its size, height and access. K-Rend, silicone and coloured renders sit at the top of the range because they need careful low-pressure work.
How much does it cost to clean render on a house?
The cost to clean render on a whole house depends mostly on its size and height. As a UK guide, a small semi or terrace is often £400 to £700 and a larger detached house £700 to £1,500, because render is priced by wall area or per elevation. With CPAGM, render cleaning starts from £195 and the figure for your home is confirmed after a few photos.
How much is soft wash render cleaning?
Soft wash render cleaning costs from £195 with CPAGM, and across the UK usually falls in the £4 to £8 per m² range. Soft washing costs a little more than a quick pressure blast because it uses a biocide that kills the algae at the root — but it is the only safe method for render and the finish lasts far longer.
How much does K-Rend cleaning cost?
K-Rend cleaning is priced towards the top of the render-cleaning range because it must be soft washed, never pressure washed — high pressure damages the through-coloured silicone surface. As a UK guide that often means the higher end of £4 to £8 per m², or several hundred pounds for a typical K-Rend house. With CPAGM, K-Rend cleaning starts from £195 and is confirmed after a few photos.
Will pressure washing damage my render?
Yes — high pressure can strip, scar or blow off render and drive water into the wall, especially on silicone, monocouche, K-Rend and painted finishes. That is exactly why we soft wash with a biocide instead, and why the green stays away for far longer than after a quick blast.
How often should render be cleaned in Chester?
Most rendered homes benefit from a soft wash every two to four years. North-facing, shaded, coastal or tree-lined walls in our damp climate green over faster and sometimes need doing more often to stay on top of it.
Does the green come straight back after cleaning?
Not if it is soft washed properly. The biocide kills the algae and lichen at the root rather than just rinsing the surface, so the wall stays cleaner for far longer than a quick water blast — which leaves the roots alive and greens back within months.
Can you clean coloured silicone and monocouche render?
Yes. Through-coloured renders need a gentle, correctly judged treatment so the colour and texture are not affected — that is the whole point of soft washing rather than blasting them. Painted render is treated the same careful way so the paint film is not lifted.
What makes the price go up?
A larger wall area, extra storeys and height, restricted or rear-only access, a delicate render type such as K-Rend or painted finishes, heavily established algae and lichen, and adding fascias, soffits and gutters to the same visit.
Do you cover Cheshire and the Wirral as well as Chester?
Yes. CPAGM covers Chester and roughly a 45-minute radius, including Hoole, Handbridge, Upton, Saughall, Frodsham, Northwich, Tarporley, Ellesmere Port and across the wider Cheshire and Wirral area, plus parts of Wrexham and Flintshire.
