BRE365 Percolation Testing London, Surrey & Hampshire. Precision Soakaway Design.
Ensure your surface water drainage meets building regulations with our expert BRE 365 infiltration testing. We provide accurate soil permeability data essential for designing effective soakaways and sustainable drainage systems (SuDS).
Why Choose Us?
- Fully compliant with BRE Digest 365
- Detailed infiltration rate calculations
- Comprehensive reports for planning
- Fast turnaround times
What is BRE365 Percolation Testing?
A BRE365 percolation test (also known as an infiltration test) is the standard method used to determine the permeability of soil. This data is critical for designing soakaways and other infiltration-based Sustainable Drainage Systems (SuDS).
If you are planning a new build, extension, or changing the surface water drainage of a property, local authorities and building control will typically require a BRE 365 test to ensure the ground can absorb the surface water runoff effectively without causing flooding.
Determine Soil Permeability
Accurately measure how quickly water drains into the surrounding soil.
Soakaway Sizing
Calculate the exact dimensions required for your soakaway to handle storm events.
Planning Compliance
Provide the necessary documentation and calculations required by building control.
The Testing Process
- 1
Trial Pit Excavation
We excavate a trial pit to the exact dimensions specified in the BRE Digest 365 guidelines.
- 2
Pre-soaking
The pit is filled with water and allowed to drain to saturate the surrounding soil, mimicking storm conditions.
- 3
Timed Drainage
The pit is refilled, and we carefully record the time it takes for the water level to drop between 75% and 25% full.
- 4
Calculation & Reporting
We calculate the soil infiltration rate (v) and provide a comprehensive report for your soakaway design.
Frequently Asked Questions
Common questions about BRE365 percolation testing.
How much does a BRE365 percolation test cost?
The cost of a BRE365 percolation test depends on the site location, access, and the number of trial pits required. Contact us on 01932 544 095 for a precise, no-obligation quote tailored to your project.
How long does the test take?
The testing process usually takes 1 to 2 days. The exact duration depends heavily on the permeability of your soil. Clay soils drain much slower than sandy soils and will require more time for the water levels to drop.
Can I do a percolation test myself?
While the concept is simple, building control and local authorities usually require the test to be carried out and certified by a competent professional to ensure the calculations are accurate and comply strictly with BRE Digest 365.
What happens if the soil fails the test?
If the soil is too impermeable (like heavy clay) and water does not drain fast enough, a standard soakaway will not work. In these cases, we can advise on alternative surface water drainage solutions, such as attenuation tanks or discharging to a watercourse.