Garden drainage: find the cause first

Record when the problem happens

Photograph wet areas during and after rain and note how long water remains. Explain whether the problem is new, seasonal or linked to recent building work. Look for obvious blocked surface channels from a safe position. These observations help a contractor understand the pattern, but they do not establish the underground cause on their own.

Avoid choosing a solution too early

Standing water can relate to levels, compaction, ground conditions or a drainage defect. A soakaway is not suitable for every property, and a new channel still needs somewhere appropriate to discharge. Ask how the proposed investigation will distinguish between the possible causes before agreeing extensive excavation.

Coordinate levels and outlets

Discuss the house, neighbouring land, paths and existing drainage together. Water should not simply be moved to create a problem elsewhere. Any proposed connection or discharge needs the appropriate checks and permissions. Keep access for future inspection and maintenance in the design.

Agree how success will be assessed

Ask what is included in the quotation, what remains uncertain and how unexpected findings will be handled. Keep records of any installed drainage routes and components before they are covered. After completion, observe the area in suitable weather and follow the maintenance guidance. Avoid judging performance only from a dry-weather photograph.

Related guides

• Site preparation before landscaping
• Work near gas, electricity and water services
• Footings and concrete bases: questions before work starts