Clean a building.

In the UK's damp climate, moss, algae, and lichens can quickly take hold on brickwork and walkways, leading to slippery surfaces and potential water ingress. A comprehensive clean not only improves the look of your property but also identifies minor maintenance issues before they become expensive repairs.

What Does the Work Involve?

• Internal Communal Areas: Removal of litter, dusting of fixtures, and clearing cobwebs from high corners and light fittings.
• Floor Maintenance: Thorough sweeping and mopping of staircases, landings, and entrance halls using industrial-grade detergents.
• External Pressure Washing: Deep cleaning of walkways, bin stores, and paved areas to remove slime, moss, and oil stains.
• Window and Frame Cleaning: Washing of accessible ground and low-level windows, including sills and frames.
• Biocidal Treatments: Application of specialist cleaners to kill mould, algae, and fungi, preventing regrowth for up to 24 months.
• Specialist Fouling Removal: Safe removal and disinfection of bird droppings (guano) using appropriate PPE and sanitising agents.
• Maintenance Reporting: Identifying and reporting blocked gullies, damaged masonry, or failed lighting discovered during the clean.

Typical Costs

Pricing for building cleaning varies significantly based on the size of the property and the level of "soiling." Most UK contractors charge a minimum call-out fee to cover travel and equipment setup.

Factors affecting the final price include the height of the building, the proximity to a water source, and whether specialist "soft wash" equipment is required for delicate heritage masonry.

How Long Does It Take?

• Routine Communal Clean: 1–3 hours for a standard three-storey stairwell and entrance.
• External Pressure Washing: 3–6 hours for walkways, bin stores, and perimeter paths.
• Full Exterior Deep Clean: 1–3 days depending on the use of biocides and steam cleaning equipment.
• High-Rise or Complex Access: 3–5 days if scaffolding or mobile elevated work platforms (MEWPs) are required.

DIY or Professional?

While basic internal vacuuming and mopping are manageable for homeowners, external building cleaning is strictly professional territory. Pressure washing brickwork incorrectly can strip mortar and cause internal damp, while working at height requires specialist training and equipment.

Professional cleaners use regulated biocides and steam systems (like DOFF or JOS) that clean effectively without damaging the substrate of the building.

Furthermore, handling hazardous waste like bird guano or heavy mould requires specific PPE and disposal protocols under UK health and safety legislation that most DIYers cannot meet.

Choosing the Right Tradesperson

• Check Insurance: Ensure they have Public Liability insurance (minimum £2m, though £5m is preferred for communal blocks).
• Ask about COSHH: They should provide Control of Substances Hazardous to Health (COSHH) data sheets for any chemicals used.
• Verify Access Qualifications: If using a cherry picker, the operator must hold a valid IPAF (International Powered Access Federation) licence.
• Waste Licence: Confirm they hold a Waste Carrier Licence from the Environment Agency if they are removing debris from the site.

Questions to ask:

• "Do you use high-pressure water or a low-pressure 'soft wash' system for my type of stonework?"
• "Are you insured to work at heights above two storeys?"
• "Will you provide a RAMS (Risk Assessment and Method Statement) before starting?"
• "How do you ensure the safety of residents or the public during the cleaning process?"

UK Regulations

• Working at Height Regulations 2005: Mandatory requirements for any work performed where a person could fall a distance liable to cause personal injury.
• COSHH: Regulations governing the use of cleaning chemicals and biocides to protect the environment and health.
• Health and Safety at Work Act 1974: The primary legislation covering occupational health and safety in Great Britain.
• Waste Duty of Care: You must ensure the contractor provides a Waste Transfer Note if they take any rubbish away.

Common Problems

• Water Ingress: Using excessive pressure near window seals or vents can cause internal flooding and damp.
• Chemical Staining: Using the wrong pH cleaner on natural stone (like limestone or sandstone) can cause permanent orange or white staining.
• Poor Communication: Failing to notify residents often leads to complaints regarding blocked access or wet paint/floors.
• Inadequate Drainage: Pressure washing without checking gullies first can lead to flash flooding in bin stores or basement areas.

Frequently Asked Questions