Why it matters more than the finish
Water needs a suitable route through or away from the surface. Drainage problems can affect use and contribute to deterioration, so levels, supporting construction and outlets are considered together.
The routes water can take
Water may pass through a permeable construction, be collected for infiltration where ground conditions allow, or be managed through a designed drainage arrangement with an appropriate outlet. The right approach depends on the site, available capacity and any permissions required.
A surface layer alone does not establish the performance of the complete system. Your proposal should explain the proposed water route, included channels or connections and any checks still required.
What we look at during your assessment
- Where the water goes now when it rains hard.
- Existing falls and whether they run towards the property.
- Inspection chambers, manholes and any drains already on the plot.
- Levels against the property, including the damp-proof course.
- Whether there is room for a soakaway, and where the outfall would be.
What your proposal should answer
- Which drainage method is being used and why.
- Whether channel drainage is included, and over what length.
- Whether connections to an existing drain or outfall are included.
- What is not included, so nothing arrives later as a surprise.
If we can't see enough on the day
Sometimes the answer isn't obvious from the surface — a blocked drain, a hidden run or a soakaway that has already failed. In that case we say the estimate is incomplete and arrange the check that resolves it, rather than guessing a figure.