Is DIY Pressure Washing Safe for Your House Exterior?

House washing looks simple enough — point, spray, done. In practice, the wrong pressure, angle or technique can damage render, timber cladding, mortar joints and paint finishes, sometimes permanently.

Common DIY mistakes

• Using too much pressure on soft surfaces like weatherboard or old render.
• Holding the nozzle too close, which can strip paint or etch surfaces.
• Forcing water behind cladding or into window and door seals.
• Missing mould rather than actually removing it, so it returns within weeks.
• Not accounting for runoff, drainage or nearby plants and garden beds.

When it makes sense to call a professional

If your home has render, older paintwork, timber features or you're simply not confident with pressure equipment, it's worth getting a professional opinion first. We use commercial-grade equipment calibrated for each surface type, so you get a thorough clean without the risk.

The real cost of getting it wrong

Stripped paint, cracked render or water forced behind cladding aren't always obvious straight away — sometimes the damage shows up weeks later as bubbling paint, damp patches or mould growth behind the wall. Repairing that kind of damage typically costs far more than a professional clean would have in the first place.

What professional house washing looks like

• Pressure and nozzle selection matched to the specific wall material — render, brick, weatherboard or cladding all need different handling.
• Pre-treatment for mould and organic growth so it's actually removed, not just rinsed off the surface.
• Careful attention around windows, vents and roof lines to avoid forcing water where it shouldn't go.
• A methodical, even pass across the whole exterior for a consistent finish rather than obvious streaking.

If you've already attempted a DIY clean and you're not happy with the result, or you're just not confident tackling it yourself, get in touch for a free quote — we're happy to assess the property and explain what's involved before any work starts.