Short answer
Most render cleans in Chester cost from around £350 for one or two walls of a smaller home, from £550 for a typical semi-detached house, and from £850 for a larger detached property. Render is soft washed with a low-pressure biocide treatment, never jet washed, and the price depends on the wall area, the height and access, and how much green and black algae has built up.
What actually changes the price
Render cleaning is priced on the wall area, the height and the condition — not just the time spent on site. A single render panel on a bungalow is straightforward. A three-storey rendered townhouse stained green from gutter to ground, with tight side access, takes longer, needs more reach equipment and uses more treatment.
Across Chester, Hoole, Handbridge and the wider Cheshire and Wirral area there are a lot of rendered and pebbledashed homes, and our damp 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. That 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.
The type of render matters too. Modern through-coloured silicone and monocouche renders, older sand-and-cement render, K-Rend and pebbledash all behave differently, so the right method and the right strength of treatment protect the finish rather than mark or strip it.
Render cleaning — guide prices in Chester & Cheshire
| Job | Guide price | What affects it |
|---|---|---|
| One or two walls — smaller home | From £350 | Single or two-storey, limited render area, easy access |
| Whole house — typical semi-detached | From £550 | Full render soft washed all round, standard access both sides |
| Whole house — larger detached | From £850 | Bigger wall area, more elevations, access or height raises this |
| Render plus fascias, soffits and gutters cleaned | From £125 | Add-on so the whole frontage is done in one visit |
| Heavy algae, lichen or red staining | From £75 | Where growth is well established and needs a stronger treatment |
Treat these as guide prices for typical Chester homes. The job is confirmed after a few photos or a quick visit, because the render type, wall area, height, access and level of staining all change the scope.
What a professional render clean involves
- 1
Inspect the render and protect the area
We check the render type and condition, look for cracks or blown 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.
- 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.
- 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.
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 |
| 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 £350, insured, with a finish that holds up |
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, monocouche, K-Rend, pebbledash or older sand-and-cement) and how the sides of the house are accessed
Frequently asked questions
How often should render be cleaned in Chester?
Most rendered homes benefit from a soft wash every two to four years. North-facing, shaded or tree-lined walls in our damp climate green over faster and sometimes need doing more often to stay on top of it.
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 and K-Rend finishes. That is exactly why we soft wash with a biocide instead.
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.
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.
What makes the price go up?
A larger wall area, extra storeys and height, restricted or rear-only access, heavily established algae and lichen, and adding fascias, soffits and gutters to the same visit.