Percolation Testing & Drainage Field Design in Portsmouth
BRE 365 percolation testing to confirm whether the ground will drain, and a correctly sized drainage field designed from the result.
Free · No obligation · Under 2 minutes
In short
BRE 365 percolation testing to confirm whether the ground will drain, and a correctly sized drainage field designed from the result. We match you with up to 3 verified local specialists in Portsmouth — a shortlist, not the whole market, so you compare quotes without being bombarded. Local specialists know Portsmouth's drainage and deal with Southern Water regularly.
Local to Portsmouth
What drainage in Portsmouth actually looks like
Your water company
Southern Water serves Hampshire. It's responsible for public sewers and the lateral drains beyond your boundary — including build-over agreements.
Who's responsible? →Local ground conditions
Portsmouth has chalk and gravel soils in places, with soakaway viability that varies by location. A percolation test is essential before any surface-water work.
Soakaway rules & costs →Local housing age
Portsmouth has a high share of Victorian and Edwardian terraces. Older clay drains here are prone to cracks, displaced joints and root ingress — what a CCTV survey pinpoints.
Why drains keep blocking →When to book
Blockages spike in December–January as festive fat and wipes hit the sewers (Water UK). Autumn is the best time to survey — before winter rainfall raises the risk of flooding and backing up.
Drainage questions in Portsmouth
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