Business · 4 min read · Updated 6 November 2026
Render cleaning for blocks of flats: a guide for managing agents
Why blocks and commercial buildings are different
Cleaning the render on a single house is a quick job agreed between a homeowner and a contractor. On a block of flats, retirement development, office or retail parade, more people are affected and there are more rules to follow. Costs are usually shared through service charges, the work is often at height on several elevations, and residents, tenants or customers need to be kept informed and safe.
Section 20 consultation for leasehold blocks
Under Section 20 of the Landlord and Tenant Act 1985, as amended, landlords in England and Wales must consult leaseholders before carrying out qualifying works where any one leaseholder's contribution will be more than £250. Render cleaning across a whole block can easily pass that threshold, especially if scaffolding is needed.
The process normally involves a notice of intention, a period for leaseholders to comment and nominate contractors, obtaining estimates, and a further notice with the estimates. Each stage has its own consultation period, so allow time in the programme. Many managing agents bundle render cleaning with other cyclical work, such as gutter clearing or decoration, to share access costs.
This is a summary only. Managing agents should follow current legal guidance or take advice on their specific leases and obligations.
Choosing the right access
| Building | Common access approach |
|---|---|
| Two to three storey block with open grounds | Water-fed poles or a cherry picker |
| Four storeys or more | Cherry picker, scaffold or rope access |
| Building on a pavement | Licence for equipment on the highway, signage, barriers |
| Block with balconies | Coordinate with residents, protect balcony items |
| Car parks below walls | Arrange for cars to be moved or covered |
Access is often the largest part of the cost. Sharing scaffolding or a cherry picker with other planned work can reduce the overall charge to leaseholders.
Health and safety duties
On commercial and residential blocks, the managing agent or freeholder acting as a business client has duties under the Construction (Design and Management) Regulations 2015 for construction work, and the definition of construction work can include cleaning that uses water or abrasives at high pressure or substances classed as hazardous. Clients should provide relevant information about the building, such as asbestos surveys, roof access arrangements and fire safety information.
- Share the asbestos register and any known hazards
- Confirm the contractor's risk assessment and method statement
- Agree exclusion zones around access equipment
- Keep fire exits and escape routes clear at all times
- Plan how residents with limited mobility will be kept safe
Communicating with residents
Residents are far more tolerant of work they know about. A clear notice two to four weeks before the work, and a reminder a few days before, avoids most complaints.
- Dates and expected working hours
- Which elevations are being cleaned on which days
- Requests to close windows and remove items from balconies and sills
- Arrangements for parking and moving cars
- Advice for residents with pets, plants or bird feeders on balconies
- A contact for questions during the works
Planning render cleaning into the maintenance cycle
Many blocks are redecorated on a cycle of around five to seven years, often set out in the lease. Aligning render cleaning with that cycle, or with roof and gutter work, keeps access costs down and makes service charge budgeting more predictable. A reserve fund contribution for exterior cleaning avoids large one-off bills.
- Inspect the elevations each year and photograph them for the maintenance file
- Clean shaded and north facing elevations more often than the rest if budgets are tight
- Combine with gutter clearing so overflow does not restain clean walls
- Record the products and methods used, so future contractors can follow the same approach
Getting comparable quotes
To compare quotes fairly, give every contractor the same specification. Include the render type if known, approximate wall areas, number of storeys, any areas excluded, the cleaning method required, whether a protective treatment is wanted, and how access will be achieved. Ask for prices broken down by elevation or block if the work may be phased.
It also helps to agree what result is expected. Some treatments clean instantly, while others improve gradually over several weeks. Agreeing this upfront prevents disputes when the work is signed off.
Ask each contractor to confirm in writing how they will protect windows, cars, balconies and landscaping, and how runoff will be managed. For blocks with communal gardens or ponds, this matters as much as the cleaning method itself. Keep these details with the Section 20 paperwork, so leaseholders can see what was specified and why the chosen quote represented value.
Frequently asked questions
Does render cleaning need Section 20 consultation?
It does if the work counts as qualifying works and any leaseholder's contribution will be more than £250, in England and Wales. Cleaning a whole block, especially with scaffolding, often reaches that level. If consultation is not carried out properly, the landlord may only be able to recover £250 per leaseholder unless a tribunal grants dispensation.
How often should a block of flats have its render cleaned?
There is no fixed rule. Many blocks are cleaned every three to seven years, depending on render type, orientation, nearby trees and whether a protective treatment was used. North facing walls and buildings in damp or wooded areas need cleaning more often. Including render cleaning in a planned maintenance schedule helps spread the cost through service charges.
Can render be cleaned while residents are at home?
Yes. Residents usually stay in their homes during render cleaning. They should be asked to keep windows closed while their wall is being treated, move items off balconies and sills, and avoid areas around access equipment. Fire escape routes must stay clear throughout. Clear notices beforehand make this straightforward.
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