Cost guide
How much does a Ground investigation cost?
Thinking about a building project? Understanding the ground beneath your feet is a really smart first step. A ground investigation helps you do just that. It tells you what kind of soil you're building on, how stable it is, and if there are any hidden surprises. This information is vital for designing safe, long lasting foundations for your new extension, home, or commercial building. It also helps your architect and structural engineer make the best choices from the start.
Typical price
£1,000 to £5,000
What changes the price
Project Size
Larger building plots or more complex projects naturally need more extensive investigation work.
Site Access
Difficult access for machinery or personnel can add to the overall time and cost of the work.
Soil Complexity
If the ground has many different layers or unusual conditions, more testing will be needed.
Testing Type
Some specialist tests, like looking for contamination, are more involved and cost more.
Urgency
If you need the report very quickly, firms might charge a bit more for a faster turnaround.
Report Detail
A very detailed report for a complex foundation design will naturally be more comprehensive and cost more.
Prices by region
| Region | Low | Typical | High |
|---|---|---|---|
| London | £1,800 | £4,500 | £7,000 |
| South East | £1,500 | £3,800 | £6,000 |
| South West | £1,300 | £3,200 | £5,200 |
| East of England | £1,400 | £3,500 | £5,500 |
| Midlands | £1,200 | £3,000 | £5,000 |
| North West | £1,200 | £2,900 | £4,800 |
| North East and Yorkshire | £1,100 | £2,700 | £4,500 |
| Scotland and Wales | £1,000 | £2,600 | £4,400 |
Questions people ask
Why do I need a ground investigation?
It helps your engineer design the correct foundations, ensuring your building is safe and stable for decades to come. This avoids costly problems later down the line, saving you time and money overall.
What does a ground investigation involve?
It typically includes taking soil samples from boreholes or trial pits, then testing them in a lab. You'll then receive a detailed report with recommendations for your foundation design.
How long does a ground investigation take?
The site work usually takes a few days, depending on your project's size and ground conditions. The full report can then take a few weeks to be completed after lab testing.
Will it damage my property?
Reputable firms take great care to minimise disruption and leave your site tidy. Any small holes are filled in, and they will discuss access with you beforehand.
Can I skip this step to save money?
Skipping this step is not recommended and can lead to serious and very expensive issues with your building's foundations later. It is a vital investment in your project's long term success.
What happens after the investigation?
You'll receive a detailed report with recommendations that your structural engineer will use for the foundation design. This report is crucial for planning permission and building control applications too.