How to Clean a Patio or Driveway Without Damaging It

Algae, moss and lichen do not damage paving but they do make it slippery. Regular brushing does most of the work to keep surfaces safe, while pressure washing is quick but can mark soft stone and strips the sand from block paving joints. If you hire a professional for patio cleaning, the work typically costs about £2 to £8 per square metre in 2026, with a minimum charge of around £80 to £120.

Do you need to clean your patio at all?

Algae, lichens, liverworts and mosses on hard surfaces are common across the UK. They do not damage the surfaces they grow on, so from a structural perspective, leaving them alone is perfectly fine. The main reason to manage them is as a safety measure on surfaces that are walked on, because they make patios, drives, paths, decking and steps slippery.

Algae thrive in wet, shady conditions with poor air circulation. They build up heavily after wet winters when the paving stays damp for months at a time. Changing the environment around the paving is the most effective way to stop the growth returning.

Because non-chemical methods are effective, the Royal Horticultural Society says there is no need for mosskillers or chemical patio cleaners. Any growth returns if the damp and shady conditions stay the same, so scrubbing the paving with a chemical cleaner is a temporary fix that does not solve the root cause.

Brushing and other gentle methods

To control growth and keep surfaces safe, brush the paving regularly with a stiff broom or a wire brush. You can use a pointed weeding tool or an old knife to scrape out moss in the cracks between paving slabs. If you have gravel paths or a gravel driveway, rake the gravel regularly to disrupt weed growth and keep the surface looking smart.

You can also change the environment around the patio to keep it dry. Prune overhanging plants to let more light and air reach the ground. Check that your paving has a slight fall so that rainwater runs off rather than standing in puddles. A fall is a slight slope built into the hard landscaping that sheds water. If paving is laid poorly with no fall, water pools on the surface or runs towards the house, creating the perfect damp conditions for algae to grow.

You can improve drainage along the edges of the patio by digging shallow gravel-filled channels. Keep all your drains clear so that water flows away quickly. If you are planning a new patio or driveway, choose permeable paving. A permeable surface lets water soak through into the ground beneath, which reduces puddles. An impermeable surface blocks water, meaning the rain must run off into a drain or a flowerbed.

Pressure washing without damage

A pressure washer removes growth quickly, but you should use it with care where drainage is poor. The extra water can make damp problems worse for your house or garden. Pressure washing uses a lot of water and energy for a temporary result, and you must always wear goggles to protect your eyes from flying debris.

High pressure suits hard surfaces such as concrete, block paving and most standard slabs. However, it is the wrong tool for render, soft pointing, painted surfaces and some natural stone. Freehand passes with a high-pressure lance can leave visible stripes across the paving, and the fierce jet can pit or etch soft sandstone and limestone to leave permanent damage.

High pressure can also blow out ageing mortar joints between the slabs. Where high pressure is too aggressive, a low-pressure soft wash is the professional alternative used by cleaning contractors.

Natural stone, concrete and block paving need different care

Different materials require different cleaning methods to avoid damage. Concrete slabs and concrete driveways are hard and can usually withstand standard jet washing. Natural stone such as sandstone, limestone or granite is softer and more porous. It needs lower pressure and more care to clean without etching the surface.

Tarmac should be washed at a lower pressure to avoid stripping the surface layer of asphalt away. Block paving is robust enough for pressure washing, but the process causes a separate problem with the joints that needs fixing after the clean.

If you are hiring a professional, ask them to confirm the surface type and the pressure they plan to use. A good contractor adapts their equipment to suit the material, rather than blasting every driveway with the same machine.

Refilling the joints and sealing the surface

A block paving driveway or patio relies on kiln-dried sand brushed tightly into the joints. This dry sand creates friction between the blocks and stops them from moving when a car drives over them. Jet washing blasts this kiln-dried sand straight out of the joints.

Skipping the re-sand loosens the blocks over time, so the sand should be replaced once the paving is dry, before weeds take hold in the empty gaps. A good block paving cleaning job always re-sands the joints afterwards. Our guide to how much a block paving driveway costs explains what goes underneath the blocks.

Sealing the surface is an optional extra. It slows down the return of weeds and helps to prevent staining from oil or organic matter. A full clean, re-sand and seal is typically done every three to five years to maintain the paving.

How much professional patio and driveway cleaning costs

Landscapers and cleaning contractors price the work based on the area to be cleaned and the type of surface. Natural stone costs more to clean because it takes more time and care. Published rates for patio slabs, flags and Indian sandstone priced together are usually £2 to £5 per square metre.

The table below shows typical professional rates per square metre for different surfaces.

These are typical published prices for 2026, and local quotes will differ. Most firms have a minimum call-out charge to cover their travel and setup time.

The total price depends heavily on the size of your patio. London and the South East cost more than the rest of the UK.

These are typical published prices for 2026, and local quotes will differ.

Driveway cleaning covers larger areas and the costs reflect this. For a small patio or a front path measuring up to 40 square metres, pressure washing costs £120 to £200. An average patio or driveway of 40 to 80 square metres costs £200 to £350. A large driveway over 80 square metres costs £350 to £600 or more.

When looking at a typical 40 to 60 square metre driveway, a pressure wash only costs £120 to £300, which breaks down to £3 to £6 per square metre for block paving, concrete or tarmac. A concrete driveway or path usually costs £2 to £4 per square metre to clean. Tarmac also costs £2 to £4 per square metre and must be washed at a lower pressure to avoid stripping the surface.

Re-sanding block paving joints on a typical 40 to 60 square metre drive adds £200 to £500 to the bill, which is £5 to £10 per square metre. Sealing block paving or imprinted concrete adds £150 to £400, working out at £3 to £8 per square metre. A full clean, re-sand and seal on a typical driveway costs £300 to £700. For a larger block paving driveway, a full clean, re-sand and seal can reach £600 to £900. If the surface needs a specific weed or moss treatment, this adds £40 to £100. London rates run about 25 to 30 per cent above the UK average.

Citizens Advice suggests getting written quotes from at least three different traders. A quote is a fixed price, while an estimate is a rough guess, so you might end up paying more. Ask for two or three recent examples of similar work and the contact details of those customers. Check the trader's insurance and your own buildings insurance. Get a written contract covering timings, tidying up, materials and payments. Pay by card rather than cash, pay in stages, and avoid deposits. If a deposit cannot be avoided, do not agree to pay more than 25 per cent upfront. You might be able to cancel within 14 days of telling the trader you want the work done or signing a written contract.

Runoff, drains and chemicals

Cleaning a patio or driveway produces a lot of dirty water. The runoff of sand, dirt and any cleaning chemicals should not be allowed to enter watercourses or storm drains. Many driveways slope towards a road gully that leads straight to a local watercourse.

Government rules state that surface water drains discharge directly to the environment. A business must make sure that contaminated water from activities such as yard cleaning goes to the foul drain, is recycled, or is removed by a registered waste carrier. Only clean water should go into a surface water drain or soakaway.

In England, a business that causes pollution could get an unlimited fine, go to prison for up to five years, or both, and have to pay for the clean-up. Ask the cleaning contractor how they handle the runoff water before you hire them. A trader who carries waste away from your property must be a registered waste carrier, and you can check this public register online.

Doorstep offers to clean your drive

You might get a knock at the door from someone offering cheap paving cleaning. These doorstep callers often propose a cash deal to jet wash a drive cheaply, with no written specification or contract.

Citizens Advice says that if you arranged the work somewhere other than the business's premises, for example at your home or in the street, you have a cooling-off period of at least 14 days to cancel and get a refund. The business must give you details of how to cancel. If they do not, the cooling-off period is extended by 14 days from when you receive them, up to a maximum of one year. If you asked for the work to start within the 14 days, you might have to pay for some or all of it.

Under the Consumer Rights Act 2015, any work you pay for must be done with reasonable care and skill. If a contractor damages your paving or leaves the job unfinished, you can ask for it to be put right or seek a partial or full refund. A reputable contractor provides a written quote, a clear price and details of your cancellation rights so that you are protected.

What to ask a cleaning contractor

Before you agree to a professional clean, ask the contractor these questions to understand exactly what they are pricing for:

• What is the surface type and what pressure will you use to clean it?
• Is re-sanding included in the price for block paving?
• Does the quote include sealing the surface afterwards?
• Do you have a minimum call-out charge?
• Will you need to use my water supply and is that factored into the cost?
• How do you handle the dirty runoff water to keep it out of surface water drains?
• Do you have the correct insurance in place?
• Can you provide a fixed written price rather than an estimate?

Common questions

How to clean patio slabs without a pressure washer?

The most effective non-chemical method is regular brushing with a stiff broom or a wire brush to remove algae and moss. You can scrape out the joints with a pointed weeding tool. Improving the drainage and pruning overhanging plants stops the damp conditions that allow algae to thrive.

Can you jet wash Indian sandstone?

You can clean Indian sandstone, but high pressure can pit or etch the soft and porous surface. A low-pressure soft wash is the safer professional method. Because it needs more care, natural stone costs more per square metre to clean than concrete slabs.

What is the best time of year to clean a patio?

Cleaning once a year suits most patios, and doing this in the spring removes the algae and moss that builds up over the wet winter months. Cleaning in the autumn is also an option to clear fallen leaves before they rot and stain the paving.

How often does a driveway or patio need cleaning?

An annual clean is usually enough to keep the surface safe. If your patio is heavily shaded or stays damp throughout the winter, it may need cleaning twice a year to stop algae making the surface slippery.

Why do weeds keep coming back in my block paving?

Weeds grow in the sand between the blocks. When a driveway is pressure washed, it strips the kiln-dried joint sand away. If the joints are not correctly re-sanded, weeds return quickly in the empty gaps and the blocks eventually loosen. Sealing the surface after re-sanding slows down weed growth.

Next steps for your patio or driveway

Before you decide how to tackle a slippery patio or a dirty driveway, decide on the best approach for the materials you have.

• Identify your paving material to see if it needs a low-pressure wash or standard jet washing.
• Try brushing the surface and clearing the joints with a weeding tool first.
• Check whether poor drainage or heavy shade is causing the damp conditions that algae prefer.
• If you have block paving, budget for re-sanding the joints after the wash.
• Ask contractors for three written quotes that state the pressure used and how runoff is handled.

Once you know what the job requires and whether you need a simple wash or a full re-sand and seal, you can find a landscaper near you to provide a firm written quote.