DOFF Cleaning Cost 2026: UK & London Pricing Guide

TL;DR

DOFF cleaning costs between £15 and £40 per square metre across the UK in 2026, with London prices running 25 to 40% higher. The exact price depends on surface type, contamination severity, access requirements, and whether the building is listed. For a typical 100m² facade, expect to pay £1,500 to £4,000. DOFF is more expensive than standard pressure washing, but it is the only method approved by Historic England for use on protected buildings, and it prevents the costly masonry damage that cheaper methods often cause.

What Is DOFF Cleaning?

DOFF cleaning is a specialist method that uses superheated water (up to 150°C) delivered at low pressure to remove dirt, biological growth, paint, and graffiti from building surfaces. Developed by Stonehealth Ltd, the system operates at just 3 to 5 litres per minute, making it far gentler than conventional pressure washing. It is accredited by both English Heritage and the Royal Institute of British Architects for use on protected and historic buildings.

The key distinction: DOFF relies on heat to break the bond between contaminants and the substrate. Pressure washing relies on force. That difference matters enormously on porous stone, aged brick, and heritage masonry where force causes irreversible damage. For a deeper look at the technology, read our guide on how the DOFF system works.

How Much Does DOFF Cleaning Cost?

This is the question most people searching for DOFF cleaning cost actually want answered. Here are the current UK figures for 2026, drawn from multiple contractor sources and public procurement data.

DOFF Cleaning Cost Per Square Metre (2026)

Task Complexity	UK Average	London Average
Basic cleaning (light biological growth)	£10 to £20/m²	£18 to £35/m²
Standard cleaning (moderate dirt, paint, or graffiti)	£15 to £40/m²	£20 to £45/m²
Complex projects (difficult access, heavy contamination, multiple passes)	£40 to £80/m²	Higher still

The average DOFF cleaning cost per square metre across the UK sits between £15 and £28 for standard work. In London, the baseline is £18 to £35.

For a general overview of graffiti removal pricing, including DOFF, see our full UK and London cost guide.

Domestic Benchmarks

Smaller residential jobs follow different pricing logic because minimum call-out charges apply. Cleaning the stonework of a 2 to 3 bedroom cottage typically costs £1,200 to £3,600 including VAT, assuming ground-level access with extension poles. Stone windowsills on a typical home start from around £495 plus VAT.

What About Large Commercial Projects?

For a typical building facade of around 100m², expect to pay between £1,500 and £4,000 depending on complexity. One of the most useful public benchmarks comes from the Isle of Wight Heritage Action Zone, where the Guildhall restoration project budgeted £30/m² for DOFF and JOS cleaning to remove masonry paint across 789m², totalling £23,670. That kind of real procurement data gives facilities managers a credible reference point.

2026 Price Trends

DOFF cleaning prices have risen approximately 8 to 12% from 2025 levels. The main drivers are increased energy costs (superheated water systems are energy-intensive) and tighter environmental compliance regulations. Planning budgets based on 2024 data will leave you short.

The London Premium

London rates run 25 to 40% above national averages. Within London, there is further variation. Central postcodes (EC, WC, SW1, W1) command the highest DOFF cleaning costs due to congestion charges, parking restrictions, and the complexity of working in dense commercial areas. Outer boroughs like Croydon, Bromley, and Barnet typically cost 15 to 20% less than central London.

What Affects DOFF Cleaning Cost?

A flat per-square-metre price can be misleading. One London contractor who consistently ranks among the top search results makes an important point: if an exterior cleaning provider offers a standardised per-square-metre cost, you may also be receiving a standard general clean, regardless of whether your job requires a more bespoke or property-specific method statement. In other words, the cheapest quote might mean the least careful work.

Here are the six main factors that push DOFF cleaning costs up or down.

Surface Type and Texture

Flat, smooth stone cleans faster than rough-cut Cotswold stone or heavily textured brick. The total area matters too, but texture determines how many passes the operator needs and how much water each square metre consumes. Larger areas benefit from economies of scale, bringing the per-metre cost down.

Contamination Severity

Simple biological growth (moss, algae, lichen) is the cheapest to remove. Graffiti, oil stains, bitumen, and multiple layers of paint all take longer and may require additional products like RID paint remover alongside the DOFF system. Practitioners in the graffiti removal industry report that jobs on historic buildings take roughly five times longer than standard graffiti removal because of regulatory requirements and the care needed to protect the substrate.

One case study from a London cleaning firm illustrates a hidden cost many building managers overlook. A commercial project required DOFF cleaning of a stone entrance covered in paint. Once the paint was removed, it became clear the previous management company had simply painted over graffiti instead of removing it. DOFF could have removed the graffiti safely in the first place, avoiding the much larger expense of stripping a botched cover-up. For guidance on avoiding surface damage during stone cleaning, see our article on removing graffiti from stone without ghosting or discoloration.

Access Requirements

This is where costs can spike unexpectedly. Ground-level work with extension poles is straightforward. Anything above that requires scaffolding (adding £300 to £1,000 or more depending on height and area), mobile elevated work platforms (MEWPs), or rope access technicians. Some contractors offer modular pole systems and rope access specifically to eliminate scaffolding costs.

Location

Beyond the London premium discussed above, travel distances to the site, proximity to water supply, and local parking or access restrictions all affect the quote. A job in a pedestrianised zone with limited vehicle access will cost more than one with a clear loading bay.

Heritage and Listed Building Compliance

This is the cost factor that catches many property owners off guard. Listed buildings require method statements, test patches on inconspicuous areas, liaison with conservation officers, and full documentation including before-and-after photography. All of this adds time and professional overhead.

Conservation bodies approve DOFF steam cleaning specifically because it does not damage historic fabric. Pressure washing is not approved for listed buildings because it is too aggressive. If your property is listed or in a conservation area, the DOFF cleaning cost includes this compliance layer, and there is no shortcut around it. For properties in this category, working with listed building specialists is not optional.

Area Size and Bundling

Cleaning 20m² costs more per square metre than cleaning 200m², because setup, transport, and equipment costs are spread across fewer metres. This is why bundling DOFF cleaning with other maintenance work or coordinating with neighbouring properties can reduce the effective rate substantially.

DOFF vs Other Cleaning Methods

Understanding how DOFF cleaning cost compares to alternatives helps determine whether the premium is justified for your specific situation.

Method	Typical Cost/m²	Best For	Risk Level
Standard pressure washing	£10 to £22/m²	Non-sensitive surfaces, general grime	High on heritage surfaces
Chemical cleaning	£15 to £35/m²	Specific stains, controlled environments	Moderate (substrate dependent)
DOFF steam cleaning	£20 to £45/m²	Heritage, graffiti, paint, biological growth	Low
TORC cleaning	£20 to £45/m²	Carbon sulphation, cement, limescale	Low
Paint removal (any method)	£20 to £45/m²	Multi-layer paint on masonry	Varies

For a direct comparison of pressure washing methods and when they are appropriate, see our guide on high-pressure washing for graffiti.

DOFF vs Pressure Washing

Pressure washing is cheaper upfront. But if it damages brickwork, stone, mortar, or roof tiles, the repair costs can far outweigh the price difference. Conservation specialists regularly warn that homeowners who try to save money by pressure washing old brickwork end up spending thousands having the pointing redone afterwards. DOFF cleaning may cost more initially, but it often prevents thousands of pounds in masonry repairs.

DOFF also uses dramatically less water: approximately 2 to 4 litres per square metre versus 20 or more for pressure washing. No chemicals are needed, and the high temperature naturally kills mould, algae, and biological growth without biocides.

DOFF vs TORC

These are complementary systems, not competitors. DOFF excels at removing paint, graffiti, algae, and organic deposits through heat. TORC uses a gentle vortex of low-pressure air, water, and fine granulate to clean carbon sulphation, cement, or limescale. Many comprehensive facade restorations use both. Our TORC system cleaning guide covers when TORC is the better choice.

DOFF Cleaning for Graffiti Removal

Most online discussions of DOFF cleaning cost focus on general stone and brick cleaning. But DOFF is particularly effective for graffiti removal on masonry, and this is where the cost comparison with alternatives becomes most stark.

DOFF removes oil-based and plastic-based spray paint, marker pen, bitumen, wax, chewing gum, and biological matter. On heritage surfaces where chemical strippers pose their own risks to the substrate, DOFF is often the safest and most effective option. The system can also be used in combination with gel-based paint removers for particularly stubborn contamination.

There are limitations worth noting. Deep contamination may require multiple passes, increasing the total DOFF cleaning cost. And acid-etched graffiti on glass requires completely different mechanical methods. DOFF cannot fix scratched or chemically burned glass. If you are dealing with etched glass vandalism, the decision is whether to restore or replace the glass.

For a broader look at masonry-specific methods, our guide on removing graffiti from brick covers the full range of options.

How to Reduce DOFF Cleaning Costs

There are practical ways to bring the total bill down without compromising results.

Schedule off-peak. Booking DOFF cleaning during autumn or winter months (October to February) can yield 10 to 15% discounts. Demand drops and contractors have more availability.

Coordinate with neighbours. If adjacent properties also need cleaning, simultaneous work can secure bulk discounts of 15 to 25%. The contractor mobilises once and cleans multiple facades in a single visit.

Avoid scaffolding where possible. MEWPs, rope access, and extension pole systems are often cheaper than full scaffolding. Ask contractors about their access options.

Bundle maintenance. Combining DOFF cleaning with other work (repointing, gutter clearing, window cleaning) can get package discounts of 10 to 20%.

Invest in prevention. Applying anti-graffiti coatings after cleaning means any future graffiti comes off faster and cheaper. It is a one-time cost that reduces repeat cleaning spend, sometimes dramatically. For a breakdown of coating prices, see our anti-graffiti coating cost guide.

Frequently Asked Questions

Is DOFF cleaning worth the cost?

For heritage buildings, listed properties, and any surface where substrate preservation matters, yes. The upfront DOFF cleaning cost is higher than pressure washing, but it avoids damage that can cost thousands to repair. On sensitive stone and brick, it is not just worth it, it is often the only responsible option.

Is DOFF cleaning safe for listed buildings?

DOFF steam cleaning is approved by Historic England and English Heritage for use on protected buildings. It is one of very few cleaning methods that conservation officers will accept in method statements for listed building work.

How long does DOFF cleaning take?

A typical domestic job (windowsills, small facade) takes half a day to a full day. Larger commercial facades of 100m² or more may take two to five days depending on contamination, access complexity, and the number of passes required.

Can DOFF remove graffiti?

Yes. DOFF effectively removes spray paint, marker, and other graffiti from brick, stone, concrete, and masonry. It is the preferred method for graffiti removal on heritage surfaces. However, it does not work on acid-etched glass graffiti, which requires mechanical polishing or glass replacement.

What is the difference between DOFF and TORC?

DOFF uses superheated water (up to 150°C) at low pressure to remove organic matter, paint, and graffiti through heat. TORC uses a vortex of air, water, and fine granulate to remove mineral-based soiling like pollution crusts and cement. Both are approved for heritage use and are often used together on large restoration projects.

Does DOFF cleaning cost more in London?

Yes, typically 25 to 40% more than UK national averages. Central London postcodes are the most expensive due to higher labour costs, congestion charges, and access restrictions. Outer boroughs cost less but still carry a premium over regional rates.

Should I get multiple DOFF cleaning quotes?

Always. Prices vary significantly between contractors, and the cheapest quote is not always the best value. Look for contractors who provide a site visit, a written method statement, and clear documentation of what the price includes, especially for listed buildings or graffiti work.

How often does DOFF cleaning need to be repeated?

For biological growth, every three to five years depending on the building’s exposure. For graffiti removal, it is reactive rather than scheduled. Applying anti-graffiti coatings after DOFF cleaning significantly extends the interval and reduces future costs.

If you need a DOFF cleaning quote for a graffiti removal or facade cleaning project in London, DUA London provides specialist DOFF and TORC cleaning with same-day availability. Get a free quote for your project.