Render Cleaning and Maintenance

Wash render with a biocide and a soft brush or low pressure, not a pressure washer held close: high pressure can blow the surface off. Keep gutters and sills sound, and seal gaps around windows, and a good render lasts decades.

Algae and stains, how to wash each finish, and the small jobs that stop big ones.

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Free, no obligation. One local contractor prices it, not five.

Low pressurenever a lance held close
Biocidekills algae at the root
Guttersthe usual cause of streaks
Decadesa sound render's life

Washing render without damaging it

Find the cause: green streaks under a sill or a leaking gutter will come back until the drip is fixed.
Apply a biocide made for masonry and leave it to work.
Rinse with low pressure or a soft brush. A pressure washer held close can strip a thin coat and drive water behind it.
Leave it to dry before judging the result: algae stains fade over weeks.

Finish	Upkeep
Silicone	Stays cleanest; a gentle wash every few years
Acrylic	Can hold dirt; wash and treat algae
Monocouche	Wash gently; lime bloom often weathers off
Sand and cement	Repaint as the paint fades
Lime	Limewash renewed every few years if limewashed

Once a year, look along the walls: cracks, hollow patches, sealant gone hard around windows, and gutters overflowing. Small fixes now save a re-render later.

More on rendering

Every job is priced by the contractor after a look at the walls.

€200–€300a day for a plastererRender repairCracks, hollow patches and stains, and when to re-render instead.Repairs →€55–€80per m²Silicone renderThin, through-coloured and water-repellent. Never painted.Silicone render →€50–€75per m²Monocouche renderOne coat with the colour in the mix, scraped to a sandy finish.Monocouche →€1,500–€4,000to re-dash a semiRendering over pebble dashCover it, paint it or remove it: which suits your walls.Pebble dash →€35–€60per m²Sand and cement renderThe traditional two coats, then masonry paint.Sand and cement →€8,000SEAI grant, detachedInsulate and renderExternal wall insulation finished in render, with the grant.External insulation →

Rendering in every county

One contractor per county. Pick yours for local prices, the weather and the council.

Every guide, calculator and county page

Jump straight to any specification guide, our interactive calculator, the technical glossary or your county page.

Questions we get asked

How do you clean render?

A masonry biocide, left to work, then a soft brush or low-pressure rinse. Fix the drip that caused the stain.

Can I pressure wash my render?

Not close up. High pressure can blow off a thin coat and push water behind it. Use low pressure and a biocide.

Why is my render going green?

Algae, where water runs or the wall stays damp: under sills, by gutters, on the shaded side. Treat it and fix the water.

Who comes out?

One rendering contractor who covers your county. Your number isn't sent to a list. They ring you, look at the walls and give you a fixed price. Nothing is booked until you say yes.

Get a free rendering price

One contractor who covers your county rings you. Nothing is booked until you say yes.

See your house rendered Get a price, no photo

Render Cleaning and Maintenance

See your house rendered, then get a price