Repair & maintenance
Render Cleaning
Soft-wash render cleaning and biocide treatment that removes algae without damaging the finish.
Green and black staining on render is almost always biological — algae, lichen and moss establishing on a damp, shaded surface. The instinctive fix is a pressure washer, and it is the wrong tool. High pressure strips the surface off thin-coat render, drives water into the substrate, and leaves an opened-up surface that regrows faster than before.
Soft washing is the correct method. A biocide is applied at low pressure and left to kill the organism at root level, then the residue is gently rinsed. Because the spores are killed rather than blasted off, regrowth is dramatically slower. We also check the cause while we are up there — overflowing gutters, blocked downpipes, overhanging vegetation and failed sills are usually what made one elevation green while the rest stayed clean.
When it is the right choice. Choose soft-wash cleaning to restore a discoloured render without the substrate damage that pressure washing causes on thin-coat systems.
Specification at a glance
| Typical guide price | £12–£26 per m² supplied and installed |
|---|---|
| Applied thickness | Surface treatment |
| Curing / drying | Same day |
| Guarantee | 12 month treatment |
| Category | Repair & maintenance |
Guide prices are indicative only and exclude scaffold, stripping and repairs. Your written quote follows a free survey.
What is included
- Low-pressure soft wash
- Biocide treatment kills spores
- Safe on silicone and acrylic
- No high-pressure damage
- Removes algae, lichen and moss
- Treats staining and streaking
- Gutter and downpipe check
- Restores original colour
- Annual maintenance option
- 12-month treatment guarantee
Get a quote for render cleaning
Tell us about the property and we will call you back to arrange a survey.
What happens next
Four steps from enquiry to finished wall
Free survey
We visit, test the substrate, measure up and identify what caused any existing failure.
Written quote
An itemised fixed price with the system named, materials specified and scaffold included.
Booked in
An agreed start date, scaffold arranged, and a clear run of days set aside for your job.
Finished and guaranteed
Site cleared, scaffold struck, guarantee documents and system warranty issued.
Coverage
Render Cleaning by county
We carry out render cleaning across all 74 counties below. Pick yours to see local detail.
East of England
South East
South West
North West
North East
East Midlands
Yorkshire
London
West Midlands
Wales
Scotland
Northern Ireland
FAQs
Render Cleaning — your questions
Can I pressure wash my render?
We strongly advise against it on thin-coat silicone, acrylic and monocouche. High pressure erodes the finish and forces water behind it. Soft washing is the safe method.
How long does render cleaning last?
Typically two to four years before noticeable regrowth, depending on shading, aspect and nearby vegetation. Annual maintenance treatments extend that considerably.
Will cleaning restore the original colour?
On through-coloured render, usually yes — the colour is intact under the growth. On painted render, cleaning may reveal that the paint itself has faded unevenly.
Why is only one wall green?
North-facing and shaded elevations stay damp far longer, so algae establishes there first. Overhanging trees and leaking gutters accelerate it.
Will you need scaffolding?
For anything above single storey, yes — it is safer and produces a better finish than working off ladders or towers. Scaffold is included and itemised in the quote.
How long before I can paint new render?
Through-coloured systems need no painting at all. Sand and cement should cure for around 28 days before masonry paint goes anywhere near it.
Do you take a deposit?
For most domestic jobs we take a deposit to cover materials and scaffold, with the balance on completion. Terms are set out clearly in the written quote.
Thinking about render cleaning?
Book a free survey and we will confirm whether it is right for your walls before you commit.