Soakaway Installation Cost

Soakaway drains are a great way to keep water away from your home, but how much do they cost to install?

The average cost to install soakaway drainage is typically around £850 for a typical, medium-sized domestic soakaway, although smaller soakaways can start from £660 and larger driveway soakaways often exceed £1,000.

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Check out our guide to find out what impacts the cost and what you have to consider before installing a soakaway.

How Much Does a Soakaway Cost?

The average cost of installing a soakaway is around £850 for a typical domestic system, although smaller soakaways for patios or roof drainage can start from around £660, while larger driveway systems often cost £1,000 to £1,200+.

The final price depends mainly on the size of the soakaway, ground conditions, and whether any reinstatement is needed afterwards. Soft ground with easy access keeps labour costs lower, while clay soil, deeper excavation, or breaking through an existing driveway will increase the total cost.

Soakaways must also be installed correctly to ensure water drains away safely from your property. If pipes are poorly aligned or undersized, water can build up underground and eventually lead to costly problems such as collapsed drain repairs.

If paving, tarmac, or drainage channels need to be lifted and reinstated during installation, labour costs will rise further, which is why itemised quotes are important before work begins.

Soakaway Installation Prices

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Soakaway Material Costs

Material costs for a soakaway typically range from £160 to £260 for the core components, depending on the size and system type chosen.

Modern plastic crate systems are the most common choice for domestic installations. They consist of interlocking polypropylene cells wrapped in a geotextile membrane, and are designed to maximise void space for water storage while being quicker to install than traditional alternatives. A 190-litre crate system costs around £160 in materials, while a 950-litre system runs closer to £260.

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Traditional rubble-filled pits use broken bricks, gravel, or hardcore instead of crates. Materials are cheaper — often little more than the cost of the aggregate — but the excavation required is usually larger, which increases labour costs and can offset any saving on materials.

Other materials included in most quotes are the inlet pipe, drainage membrane, and pea shingle or sharp sand for the base layer. Longer pipe runs from downpipes or guttering will add to materials costs.

Soakaway Labour Costs

Labour is typically the largest part of a soakaway installation quote, ranging from £500 for a small system in easy-access ground to over £950 for a larger installation.

Most soakaway installers charge a day rate of around £200 to £350 per worker, depending on location. A straightforward job with good access usually involves a 2-person team and a mini digger, completing the work in 1 day. Larger systems, clay soil, or restricted access can push this to 2 to 3 days with a bigger crew.

Access is one of the biggest variables in labour pricing. In properties where a mini digger can reach the installation area, excavation is fast. In narrow or terraced gardens — or where materials need to be carried through the house — manual digging significantly increases the time and cost involved.

If you're searching for soakaway installers near you, MyJobQuote lets you compare free quotes from local soakaway specialists. Getting at least 3 quotes is advisable, as labour rates can vary between contractors and regions.

What Affects Soakaway Installation Costs?

There are a few key factors that influence the cost of installing a soakaway:

• Size of the drainage area - Larger areas require bigger soakaways as they usually produce more runoff, meaning more materials and labour are needed.
• Depth of installation - Deeper installations may require additional excavation and support structures, increasing costs.
• Soil type & permeability - Clay soils drain poorly and may require larger or more complex soakaway systems, while sandy soils are easier to work with. More excavation may also be required for difficult soil conditions.
• Accessibility - Costs rise if contractors need to remove paving, cut through tarmac, work in tight spaces, or if the installation site is difficult to access.
• Permits and regulations - Some projects require a percolation test, building control approval, or extra drainage checks.
• Soakaway method used - Modern plastic crate systems are usually quicker to install, while traditional rubble-filled pits can involve more excavation.
• Distance from downpipes or guttering - Longer pipe runs mean more materials and labour.
• Existing underground services - The presence of underground utilities (pipes, drains, or cables) can complicate installation and increase costs.

Additional Soakaway Drain Costs

As well as the installation itself, there are a few other costs involved when fitting a soakaway drainage system.

Building Control Application

Your council needs to approve any soakaway drainage installation. Some installers handle the paperwork but charge you the council fee plus admin on top. Some soakaway installations require building control approval, particularly where new drainage connections or significant groundworks are involved.

Percolation Test

You can't just guess what size soakaway you need. Someone's got to dig test holes, fill them with water, and time how fast it drains. Some installers include it in their survey but some don't, so it's worth checking. Skip it and you risk the whole system failing because it's the wrong size for your soil type.

Waste Removal and Skip Hire

Digging out an 800-litre soakaway creates about 3-4 tonnes of soil, so you have to consider the cost to hire a skip or grab lorry, unless your quote specifically says "including muck away".

Ground Reinstatement

Installation quotes usually cover backfilling the hole, but not restoring your garden to its original presentable state. Depending on what's going on top of the excavation site, costs can vary.

Driveway Repairs

If you have front gutters, the pipes probably need routing under your driveway, which means cutting through and patching up after. Tarmac repairs add £300 to £600, while lifting and relaying block paving properly costs £500 to £1,000.

ACO Drain and Channel Drain Installation Cost

An ACO drain, also called a channel drain or trench drain, is a linear drainage solution often installed alongside or instead of a soakaway. It collects surface water across a linear run and directs it into an underground drainage system, making it a popular choice for driveways, patios, and the base of garage doors.

Materials for the channel and grate typically cost £15 to £60 per metre, depending on whether you choose a standard plastic domestic channel or a heavier-duty metal grate. Labour usually makes up the bulk of the cost, running from £250 to £600 or more, bringing most domestic installations to a total of £400 to £1,500.

Retrofitting a channel drain into an existing driveway typically costs £450 to £950 for a standard 3 to 4 metre garage threshold run. Cutting through block paving or concrete adds more to the cost than tarmac, which is quicker to reinstate.

Channel drains still need somewhere to discharge water. If there's no existing drain to connect to, a new soakaway will be needed alongside, which brings the combined cost to around £1,000 to £2,500 in total.

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How Do I Know If I Need a Driveway Soakaway?

If you're a property owner, UK Building Regulations state that you're responsible for the surface water drainage around your home.

This means there must be adequate drainage systems in place to avoid standing water issues and flooding either on your property or on the roads surrounding it as a result of rainwater accumulation.

Making a soakaway drain is one way of managing excess water if you live in an area with poor drainage. Soakaways deal with surface water issues by collecting and containing rainwater so it can gradually drain into the ground instead of contributing to waterlogging.

If you have any of the following at your property, you'll likely need to install a soakaway:

• High volume of impermeable surfaces - The fewer natural surfaces there are, the more chance there is for standing water issues on patios, pavements, drives, and roads.
• Existing drainage issues - If you live in an area where there is already an issue with standing water, you're likely to need soakaways installed as a solution.
• Building regulations - New-build properties are generally required to have driveway soakaways.

Your soakaway specialist will carry out a percolation test to assess the soil to see how quickly water drains from it.

Heavy clay soils and closely compacted soils won't drain well and won't be suitable for soakaways, but sand, chalk, gravel, and clay and sandy loam will mostly all be suitable for soakaways.

What to Consider When Installing Soakaways

Before hiring a contractor to install a soakaway, you first need to consider what you need and if a soakaway is the right solution for your property:

• Check whether a soakaway is suitable for your soil – A percolation test will show how quickly water drains and whether your ground can support a soakaway system.
• Think about where the water will come from – Roof runoff, patios, and driveways all create different drainage loads, which affect the soakaway size required.
• Allow enough distance from buildings – Soakaways should normally be installed at least 5 metres away from your home to protect foundations.
• Consider access for excavation – If the installer needs to break through paving or work in a tight area, labour costs will rise.
• Combine driveway work where possible – If you're already replacing paving or adding drainage channels, doing both jobs together usually reduces labour costs.
• Check whether existing drainage can be reused – In some cases, an existing drain or pipe run can be adapted instead of installing a completely new system. A drain survey can help determine what is needed.

Soakaway Maintenance Costs

Soakaways are largely low-maintenance, but they do require occasional attention to stay effective. The main cost to budget for is unblocking, which is typically needed when silt or debris builds up in the inlet pipe or the crate system itself.

The most common fix is high-pressure water jetting, carried out by a drainage specialist. This flushes accumulated silt through the system and usually takes a few hours. Jetting a blocked soakaway typically costs between £100 and £400, depending on the severity of the blockage and ease of access.

If jetting doesn't resolve the issue, it usually means the soakaway has silted up beyond recovery and needs replacing. A full replacement costs broadly the same as a new installation — around £660 to £1,200 for most domestic systems.

To reduce the risk of blockages, keep gutters and downpipes clear of leaves and debris. This is the single most effective way to prevent silt entering the system in the first place.

Warning signs that your soakaway needs attention:

• Water pooling around gullies or drainage points after rainfall.
• Slow drainage that takes more than 48 hours to clear.
• Soggy patches of ground above the soakaway location.
• Unpleasant smells coming from standing water near drainage points.

Soakaway vs Permeable Driveway

It's worth considering whether a permeable driveway might solve your drainage problems instead. While soakaways cost around £850, permeable paving runs £70 to £100 per square metre, but replaces your driveway at the same time.

If you're already planning driveway work, permeable surfaces could prevent the need for a separate soakaway and increase your property's value. However, if your existing driveway's in good condition, adding a soakaway makes more financial sense and is the more cost-effective option.

Here are some comparisons between soakaway costs and permeable driveway costs to help you make an informed decision:

Doing It Yourself

Driveway soakaway installation is not a simple DIY job. It is best left to professional plumbers and soakaway specialists to ensure the installation is done correctly and in compliance with local codes and regulations once the drain system is installed.

Your installer will take the following steps to install a soakaway:

• Site assessment - Before any installation begins, your soakaway fitter will assess the land. The soil will be tested to see how it drains, and the system's positioning will be determined by local regulations, avoiding underground services like electrical cables, gas, or water supplies. Soakaways must be at least 5 metres away from any structures.
• Excavation - Your installer will then start excavating the land, creating a pit for making a soakaway. Different calculations will be made to determine the depth and volume depending on your type of soakaway system. Any natural debris, such as roots or rubble, will be cleared.
• Base preparation - Once cleared, the pit will have a layer of pea shingle or sharp sand added and levelled out.
• Add soakaway crates and connect the inlet pipe - Soakaway crates will then be installed as per the manufacturer's instructions, and the inlet pipe will be connected.
• Backfilling - The soakaway will then be backfilled to stabilise the system.

Checklist: Hiring a Soakaway Drain Installer

When you start looking for soakaway installation near you, keep the following in mind to ensure you're hiring the right contractor for the job:

• Choose a specialist – Look for companies with experience in soakaway and drainage installations rather than general groundwork alone.
• Get at least 3 quotes – Comparing several installers helps you understand your local price range and spot unusually high or low estimates.
• Ask for an itemised quote – Make sure labour, materials, waste removal, and any survey or approval costs are clearly listed.
• Check previous work – Ask to see photos, reviews, or examples of similar soakaway projects they have completed.
• Understand regulations – Your installer should be aware of drainage rules, including minimum distances from buildings and boundaries.
• Check whether reinstatement is included – If paving, tarmac, or lawn needs restoring afterwards, confirm whether this is part of the quote.

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