Compare septic tank survey & inspection quotes
Buying or selling off mains drainage? A survey tells you the condition of the tank, whether the drainage field works, and whether the system is legal — in writing, before you commit.
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A septic tank is the one part of a rural property that a standard homebuyer survey will not look inside. It is also the part that can cost five figures to put right. An inspection empties and examines the tank, tests and assesses the drainage field, and produces a written report on condition, capacity and legal status — the document a conveyancer will ask for and a buyer can rely on.
Sellers must provide the system details
Under the General Binding Rules, a seller must give the buyer written details of the sewage treatment system and its maintenance, and a non-compliant system must be brought up to standard as a condition of sale. A survey before you market the property means you find that out while you still have time to price it in.
Typical cost
Inspection and written report; tank emptying to allow access is usually charged separately
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What’s involved
Septic Tank Survey
Chambers, baffles, inlet and outlet are checked for cracking, root damage, leakage and sludge depth. The tank normally needs emptying first so the internals can actually be seen.
The field is the part that fails first and costs the most to replace. Its extent, condition and any surface breakout are assessed, with a percolation test where the ground is in question.
The report states where the system discharges, whether that is lawful under the 2020 General Binding Rules, and what — if anything — would be needed to make it compliant.
FAQs
Septic Tank Survey questions
Do I need a septic tank survey when buying a house?
It is strongly advisable. A standard homebuyer or building survey does not inspect the tank or the drainage field, and a failed field or a non-compliant discharge can cost £5,000 to £15,000 to resolve. A survey before exchange gives you the condition, the compliance position and a figure to negotiate with.
What is the difference between a septic tank survey and a compliance check?
A survey is a physical inspection of the tank and drainage field, producing a condition report. A compliance check is an assessment against the 2020 General Binding Rules — principally where the system discharges to. A good survey covers both, and if it finds a problem the fix is usually a drainage field or an upgrade to a treatment plant.
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