For a rainwater soakaway, our BRE365 test measures how quickly water enters the ground. Your report records the test details and infiltration coefficient for your drainage designer, with any incomplete results or limitations explained.
Percolation testing from a family-run Farnham business.
Planning an extension, a new home or a rainwater soakaway? We carry out BRE365 percolation tests across Surrey and Hampshire, with a fixed price and a clear infiltration report for your drainage designer.
See how our percolation testing works →Trusted by homeowners and businesses across Surrey & Hampshire
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BRE365 Percolation Testing
Selected pages from our reports.
The useful result is the infiltration coefficient: how quickly water enters the ground at the tested location and depth. The report brings together the pit details, repeat readings and calculation so your designer can use the evidence.
10+
Years experience
50+
5-star reviews on Google
1500+
Surveys completed
50+
Km of drains surveyed
Ground testing first. Drainage expertise alongside it.
Start with the infiltration rate your designer needs. We also investigate ground conditions, survey drains and carry out repairs, so you can ask us about the rest of the site too.
01Investigation
Percolation Testing
BRE365 soakaway testing, from excavation and repeat fills to the measured infiltration coefficient and a report for your designer.
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02Drainage
CCTV Drainage Surveys
High-definition camera inspections to identify blockages, structural damage and root ingress - including pre-purchase homebuyer surveys.
Quoted individuallyRead more
03Drainage
Jetting & Drain Cleaning
Booked jetting that strips silt, fat and root debris from the bore, so the camera returns clean, gradeable footage of the pipe wall itself.
Quoted individuallyRead more
04Drainage
Drain Repairs & Relining
No-dig patch and full-length liners, or excavation and replacement where the grade demands it - specified from the survey, not a guess.
Quoted individuallyRead more
05Investigation
Site Investigation
Trial pits and boreholes, foundations exposed and measured, shear vane testing and opening-up works - logged and reported to BS 5930.
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06Design & install
Soakaway Design & Installation
Sizing from your measured infiltration rate, SuDS-compliant design, then installation of the crates, membranes and pipework.
Read moreIllustrative draining
How the Percologger monitors a trial pit, illustrated
We follow the water, however long it takes.
We designed and make our own Percologger to record the falling water level. It relays progress to the office so we can plan return fills around your test.
01
An agreed testing scope
Pit locations, depths, access, water and reinstatement are agreed in your fixed-price quotation.
02
Readings you can follow
Water levels and test progress are shared with you. Live updates depend on the connection at the site.
03
A result for your designer
The report sets out the measured infiltration rate, the readings behind it and any limitations. Soakaway sizing and approval are separate.
Areas we cover
Percolation testing and planned drainage work from our Farnham base, across Surrey and Hampshire. Send us the site postcode and your designer's requirements so we can confirm access and scope.
Planning a percolation test?
Still not answered? Ring the office on 01252 917235
Why we do this
An infiltration figure is only useful when you can follow the evidence behind it. We measure the pit, record the falling water level and explain the calculation, so you and your designer can see how the result was reached.
What our local customers say
Real reviews from homeowners and businesses across Farnham and Surrey.
★★★★★
“Really useful report received for my flat purchase, my solicitor has informed me "it is worth its weight in gold". I was lucky to come across this company - they have saved me a lot of potential major issues with the purchase.”
Rachel Abbey
★★★★★
“Top rate service. Professional, thorough, and immaculate when it came to regard for the property. They managed to remove tiles without damage, complete surveys and assist with potential future needs. Outstanding level of service, detail and care.”
Samuel Nash
★★★★★
“Used this company for my extension build over agreement with Thames Water and I was extremely impressed with their knowledge, service and effort. Looking forward to using them again!”
Thomas Duffy
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Tell us about your test site.
Send the site postcode, proposed test locations and anything your designer has requested. We will confirm the testing scope and give you a fixed quotation.
Fixed quotation before booking
Report for your drainage designer
Prefer to talk?01252 917235