BRE 365 Soakaway Testing

Fast, reliable infiltration testing for drainage design and planning compliance.

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If you're planning to use soakaways or other infiltration drainage systems, most local authorities require soakaway testing in accordance with BRE 365. We carry out compliant testing and provide quick-turnaround reports to support planning applications and detailed drainage design.

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What We Do

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✔ Assess the Site – We confirm suitability for soakaway testing, review ground conditions, and check site constraints.
✔ Excavate Trial Pits – Using plant machinery, we excavate test pits to the required depth (typically to proposed invert level of the soakaway).
✔ Conduct Percolation Testing – We carry out timed infiltration tests using clean water, in accordance with BRE Digest 365.
✔ Analyse the Results – We calculate infiltration rates and provide advice on soakaway design capacity.
✔ Report for Planning & Design – You receive a clear, compliant report suitable for submission to planning authorities, SuDS approval bodies, or drainage engineers.

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Typical Outcomes

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✔ Calculated infiltration rate (m/s) to inform soakaway sizing and design.

✔ Confirmation on groundwater levels encountered.

✔ Compliant test report to support planning or SuDS approval.

✔ Early warning of ground conditions that could require alternative drainage solutions