Professional Roof Cleaning
Across London & Surrey
That Lasts for Years
Our soft wash system removes moss, algae and lichen without damaging your tiles — then we apply a biocide treatment that prevents regrowth for up to 5 years. No pressure washing. No cracked tiles. Just a roof that looks and performs like new.
★ 5-Star Rated · 20+ Years Experience · Fully Insured
What Is Professional Roof Cleaning and Who Needs It?
Roof cleaning is the controlled removal of moss, algae, lichen and organic debris from your roof tiles using specialist low-pressure soft wash techniques. Unlike amateur pressure washing — which can crack tiles, strip granules and force water under flashings — professional soft washing uses calibrated equipment and biodegradable biocide solutions to clean without causing damage.
If your roof has visible green or black patches, moss growth between tiles, or dark streaks running down the surface, it needs professional attention. Moss holds moisture against your tiles, accelerating freeze-thaw cracking in winter and encouraging damp penetration year-round. In London and Surrey, the combination of mature tree cover, urban pollution and damp climate creates ideal conditions for rapid moss colonisation.
Homeowners preparing to sell, landlords maintaining rental properties, and anyone who has noticed moss lifting their ridge tiles or blocking valleys and gutters should act before the damage compounds. The longer moss is left, the more expensive the repair bill becomes.
Our service is suitable for all tile types — concrete, clay, slate and flat roofing membranes. We assess each roof individually and adapt our methods to match the material, pitch and condition of your specific property.
What Happens If You Ignore Moss on Your Roof?
Moss is not just an aesthetic issue — it is an active threat to your roof's structural integrity. Each clump of moss acts like a sponge, holding rainwater against your tiles long after the rain stops. This constant moisture exposure accelerates tile degradation, particularly through freeze-thaw cycles in colder months where trapped water expands as it freezes, cracking tiles from the inside out.
As moss thickens, it pushes under tile edges and lifts them from the battens beneath. This creates gaps where wind-driven rain can penetrate into the roof space, causing damp in loft insulation, staining on ceilings, and eventually structural timber rot. Repairs at this stage typically run into thousands of pounds.
Blocked gutters are another direct consequence. Moss debris washes into your guttering system, creating blockages that cause rainwater to overflow down external walls. This leads to damp patches, render damage, and in severe cases, foundation erosion from uncontrolled water runoff.
Many homeowners make the mistake of attempting DIY pressure washing. Standard pressure washers operate at pressures far too high for roof tiles, stripping protective coatings, breaking tile nibs, and driving water under the tile surface. The roof may look clean temporarily, but the underlying damage shortens the roof's lifespan by years.
The average cost to replace a roof in London ranges from £5,000 to £15,000. Professional cleaning and treatment costs a fraction of that — and extends the working life of your existing roof by a decade or more.
Our Proven System
How We Deliver Results
Free Roof Inspection
We visit your property, assess the moss growth, tile condition and any existing damage. You receive a detailed report and transparent quote — no obligation, no hidden costs.
Preparation & Protection
We protect your garden, windows, and external areas before work begins. All access equipment is set up safely and checked before anyone goes on the roof.
Soft Wash Cleaning
Using our calibrated low-pressure system, we remove all moss, algae and lichen from every tile surface. No high-pressure jets. No risk to your tiles, mortar or flashings.
Biocide Treatment Application
Once the roof is clean, we apply a professional-grade biocide treatment across the entire surface. This penetrates tile pores to kill remaining spores and inhibit regrowth for up to 5 years.
Final Inspection & Clean-Up
We inspect the completed roof with you, clear all debris from gutters, pathways and garden areas, and leave your property spotless. Your roof is now protected.
Why It Matters
What You Get
Extends Roof Lifespan
Regular cleaning and treatment adds 10–15 years to your roof's working life, saving you thousands in premature replacement costs.
Prevents Water Damage
Removing moss eliminates the moisture trap that causes tile cracking, damp penetration and timber rot in your roof space.
Increases Property Value
A clean, well-maintained roof signals to buyers and surveyors that the property has been properly cared for — directly impacting valuation.
No Tile Damage
Our soft wash method operates at safe pressures, unlike DIY pressure washing which cracks tiles and strips protective coatings.
Clears Blocked Gutters
We remove all moss debris from your guttering system during the clean, preventing overflow and water damage to external walls.
Long-Lasting Treatment
Our biocide treatment is designed to prevent regrowth for years. We use professional-grade products that deliver lasting results.
Roof Cleaning Methods, Materials & What to Expect
We use a two-stage soft wash system that combines mechanical moss removal with chemical biocide treatment. Stage one involves manually clearing the bulk of moss growth using specialised scraping tools designed to lift moss without scratching or chipping tile surfaces. For concrete tiles, we work with the grain of the surface texture. For clay tiles, we use softer nylon tools to protect the fired glaze.
Stage two is the soft wash itself — a low-pressure application of biodegradable cleaning solution that breaks down remaining organic matter, kills algae at the cellular level, and lifts embedded dirt from tile pores. The solution is applied at pressures below 100 PSI, compared to the 2,000+ PSI output of standard pressure washers. This is the critical difference between professional soft washing and amateur methods.
The biocide we apply is a professional-grade formulation based on benzalkonium chloride, which is approved for use on building surfaces and breaks down safely in the environment. It bonds with the porous surface of tiles and continues working for months after application, killing new spores before they can establish visible growth.
For slate roofs, we adapt our approach to account for the natural layering of the stone. Slate is more fragile than concrete or clay, and we use even lower pressures with wider spray patterns to avoid lifting or cracking individual slates. We also pay particular attention to the fixings, as slate nails can corrode over time and may need flagging during inspection.
Flat roof membranes — whether felt, EPDM rubber or fibreglass (GRP) — require a different methodology. We use soft bristle cleaning with compatible solutions that will not degrade the membrane material or compromise waterproof seams. This is an area where DIY attempts frequently cause leaks.
On residential properties, a typical semi-detached house roof takes one full day to clean and treat. Larger detached properties or roofs with complex geometry (dormers, valleys, multiple pitches) may take up to two days. We schedule work during dry periods wherever possible, as the biocide treatment needs 24 hours without rain to fully bond with the tile surface.
Commercial properties, including blocks of flats, industrial units and listed buildings, require separate assessment. We hold public liability insurance to £5 million and can provide method statements and risk assessments for property management companies and freeholders.
Common Questions