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A guide to surface water drainage.
Combined, separate or SuDS — what drainage your property has, what regs require and what new builds need.
✓ Updated May 2026✓ Free quotes✓ Vetted pros
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Costs, timelines, pitfalls and the right questions to ask before any drain specialist starts on surface Water Drainage.
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Itemised quotes from up to 3 local drain specialists on surface Water Drainage — so you can compare like-for-like, not lump sums.
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Top tips
Hiring a drain specialist, without the regret.
Four moves that separate a smooth job from a nightmare.
Inadequate drainage capacity
Heavy rain overwhelms cheap system. Calculate flow rates properly.
Discharging onto neighbour
Drainage must go to your own soakaway, surface water drain, or licensed watercourse. Never onto neighbour's land.
Front garden paving
Over 5m² non-permeable needs planning. Many infringements.
Soakaway too close
Within 5m of building can cause subsidence. Always 5m+ from buildings.
Costs & timeline
Know what it costs. Know when it ends.
Indicative UK ranges and what affects price.
Cost range
By job type
Inc. VAT · 2026
Source: NMT quotes
Source: NMT quotes
Aco linear drain per metreInstalled at threshold
£120–£350
Permeable paving per m²Material + install
£80–£150/m²
Soakaway installation1-3m³
£500–£2.5k
Rainwater harvesting tank1,500-5,000L
£800–£3.5k
Gully connection to drainPer gully
£200–£600
SuDS planting (swales/rain gardens)Per design
£500–£3k
!
Quote spread is typically ± 18% — always get 3 quotes.
At a glance
Infographic · VideoThe Drain Specialist briefing.
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Drain Specialist quick-view
Video guide
Drain Specialist explained
Surface water drainage handles rainwater from driveways, patios, and roofs. SuDS (Sustainable Drainage Systems) compliance increasingly required. Expect to pay £400–£3,500 for UK surface water drainage.
What Does the Work Involve?
Designer plans drainage strategy. Soakaways, linear drain channels, permeable paving, rainwater harvesting. Connects to existing surface water drain or soakaway. SuDS principles favour on-site infiltration over piped runoff. Compliance with Part H.
Typical Costs
| Item | Low (£) | High (£) | Notes |
|---|---|---|---|
| Aco linear drain per metre | 120 | 350 | Installed at threshold |
| Permeable paving per m² | 80 | 150 | Material + install |
| Soakaway installation | 500 | 2,500 | 1-3m³ |
| Rainwater harvesting tank | 800 | 3,500 | 1,500-5,000L |
| Gully connection to drain | 200 | 600 | Per gully |
| SuDS planting (swales/rain gardens) | 500 | 3,000 | Per design |
| Front garden permeable surface | 500 | 5,500 | Per project |
How Long Does It Take?
Standard drainage install: 2-5 days. Complex SuDS: 1-2 weeks.
DIY or Professional?
Drainage specialist or experienced landscaper. Architect/planner for SuDS strategy.
Choosing the Right Tradesperson
NADC member or APL (Association of Professional Landscapers) for permeable paving. SuDS-trained for compliance.
UK Regulations
SuDS (Sustainable Drainage Systems) policy. Front garden over 5m² with non-permeable surface needs planning permission. Building Regs Part H drainage capacity.
Common Problems
- Inadequate drainage capacity: Heavy rain overwhelms cheap system. Calculate flow rates properly.
- Discharging onto neighbour: Drainage must go to your own soakaway, surface water drain, or licensed watercourse. Never onto neighbour's land.
- Front garden paving: Over 5m² non-permeable needs planning. Many infringements.
- Soakaway too close: Within 5m of building can cause subsidence. Always 5m+ from buildings.
Frequently Asked Questions
What's SuDS?
Sustainable Drainage Systems — managing rainwater on-site through infiltration, rather than piping to drains. Reduces flooding risk.
Permeable paving — when required?
Front gardens over 5m² need permeable or drainage. Block paving with gaps qualifies as permeable.
Linear drain at driveway?
Aco channel drain catches runoff at driveway entrance, directs to soakaway or drain. Prevents flooding into property.
Rainwater harvesting worth it?
Yes for garden watering and toilet flushing. Savings depend on water tariff. 5-10 year payback typical.
Soakaway distance from house?
5m minimum. 2.5m from boundary. Closer can cause subsidence in clay soils.
SuDS compliance check?
Architect or drainage consultant. Local council planning department. For major projects, Environment Agency.
This guide was written with AI assistance and is intended for general information only. Prices are estimates based on UK averages and may vary by region. Always get at least three quotes and consult a qualified professional before starting any work.
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