Northern Ireland's Roof Cleaning Specialists
Expert moss, algae & lichen removal using advanced compressed air & soft wash technology. Protect your roof, extend its lifespan, and restore your home's kerb appeal.
Why Roof Cleaning Matters
Protecting your biggest investment starts from the top
Northern Ireland's damp, mild climate creates the perfect breeding ground for moss, algae, and lichen on rooftops across the country. From the coastal homes of Bangor and Carrickfergus to the suburban streets of Newtownabbey and Belfast, virtually every property is affected. Left unchecked, these biological growths cause serious, costly damage to your roof — and they're far more than just an eyesore.
Moss acts like a sponge, absorbing and retaining rainwater directly against your roof tiles. During Northern Ireland's cold winter months, that trapped moisture freezes and expands, gradually cracking and splitting even the hardiest tiles. Over time, moss roots penetrate beneath tile edges, lifting and loosening them until wind can dislodge tiles entirely — leading to expensive emergency repairs and the risk of water ingress into your home.
Heavy moss growth also adds significant weight to your roof structure, blocks gutters, and traps debris. Blocked gutters cause rainwater to overflow, running down walls and pooling at foundations — a recipe for damp, mould, and structural problems. Meanwhile, algae and lichen break down the protective surface coatings on tiles, dramatically shortening the overall lifespan of your roof.
Freeze-Thaw Damage
Trapped moisture expands in cold weather, cracking tiles and degrading mortar joints across your roof.
Wind Dislodgement
Moss roots lift tile edges, making them vulnerable to wind. One storm can cause thousands in damage.
Surface Degradation
Biological growth breaks down protective tile coatings, dramatically shortening your roof's useful life.
Gutter Blockage
Heavy moss blocks gutters and downpipes, causing water backup, damp walls, and foundation damage.
DIY roof cleaning is risky and often makes things worse. Pressure washers — the most common home approach — force water under tiles, break protective surface coatings, and push contaminants deeper into tile pores. The result? Faster re-contamination, potential leaks, and a roof that deteriorates even quicker than before.
Professional roof cleaning by Whitehouse Outdoor Services uses advanced techniques — compressed air technology and specialist biocide treatments — that safely remove moss, algae, and lichen without damaging your tiles. Our methods prevent regrowth for 3–5 years and can extend your roof's lifespan by 5–10 years, saving you thousands compared to a premature roof replacement. With over 20 years of experience serving homes across Northern Ireland, we know exactly which approach works best for every roof type.
Our Roof Cleaning Services
Advanced technology, proven results — the right solution for every roof
Advanced Compressed Air Cleaning
Marshall Air Pro System
Uses powerful compressed air (Marshall Air Pro system) to blast away moss, algae, and lichen without water. Completely dry process — no water forced under tiles, no moisture damage. Biocide follow-up kills spores and prevents regrowth for 3–5 years. Faster and more effective than manual removal, safer than pressure washing.
Ionics Roof Wand System
Low-Pressure Specialist
Specialist low-pressure roof cleaning system where the cleaning head hovers just above the roof surface. Water always flows DOWN the pitch — like rainfall — never forced under tiles. Ideal for sound concrete and clay tile roofs. Ground-based operation reduces roof foot traffic. Perfect pre-treatment before biocide application.
Professional Biocide Treatment
Certified Softwash Solutions
Specialist biocidal solution kills algae, moss, and lichen at cellular level. Treatment continues working for months after application. Prevents regrowth for 3–5 years (vs 6–12 months with pressure washing). Eco-responsible formulations used. Applied after every roof clean for lasting results.
Moss, Algae & Lichen Removal
Tailored Assessment
Every property is individually assessed — the right method for the right roof. Manual preparation, debris clearance, and gutter protection included. Comprehensive treatment report provided. Safe for clay tiles, concrete tiles, natural slate, fibre cement, and metal roofing.
The Transformation
See the dramatic difference professional roof cleaning makes
This Northern Ireland home had years of moss and algae buildup removed using our advanced compressed air system, followed by a professional biocide treatment to prevent regrowth for 3–5 years. The result? A roof that looks years younger, drains properly, and will last significantly longer.
Our Work
Real roof cleaning projects from across Northern Ireland
Why Choose Whitehouse?
Northern Ireland's most trusted roof cleaning specialists
20+ Years Experience
Established in 2003, we bring over two decades of professional roof cleaning expertise to every job.
4.8★ Google Rated
30+ five-star reviews from homeowners across Northern Ireland. Our reputation speaks for itself.
£5M Fully Insured
Complete peace of mind with £5 million public liability insurance covering every project we undertake.
Advanced Technology
Marshall Air Pro compressed air, Ionics Roof Wand, and certified Softwash Solutions — the best in the industry.
Heritage Approved
English Heritage approved DOFF system operator. Certified Softwash Solutions applicators for professional-grade treatment.
Free No-Obligation Quotes
Honest, transparent pricing with no hidden fees. Every quote includes a full property assessment.
What Our Customers Say
Trusted by homeowners across Northern Ireland
“First class job on my PVC, gutters and paving. Everything cleaned to a very high standard.”
Michael K.
Roof Cleaning • Newtownabbey
“Absolutely fantastic service! Graham and his team transformed our house render which was covered in green algae. It looks like a brand new house now.”
Sarah M.
Roof & Render • Belfast
“Reliable, punctual and always do a thorough job. Great communication and payment options make everything easy.”
Emma W.
Regular Customer • Newtownabbey
“20+ years of experience really shows. Professional team, competitive pricing, and the results speak for themselves.”
Robert T.
Roof Cleaning • Antrim
“My stone walls were looking really shabby after years of weathering. Graham knew immediately what the problem was and has done a marvellous job.”
Jennifer R.
Exterior Cleaning • Lisburn
Areas We Cover
Professional roof cleaning across Northern Ireland and surrounding areas
… and surrounding areas across Northern Ireland
Frequently Asked Questions
Everything you need to know about professional roof cleaning
Get Your Free Quote
Tell us about your roof and we'll provide a free, no-obligation quote within 24 hours