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Install deepflow gutters.
High-capacity 115mm+ gutters for large roofs, steep pitches or heavy rainfall areas.
✓ Updated May 2026✓ Free quotes✓ Vetted pros
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Costs, timelines, pitfalls and the right questions to ask before any guttering starts on deepflow Gutters.
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Downpipe undersized
A 125mm deepflow gutter with 68mm downpipes still bottlenecks. Use 80mm or 100mm downpipes.
Wrong bracket spacing
Deepflow brackets are spaced like standard (600mm) — wider centres sag the heavier weight.
Limited fittings range
Deepflow has fewer outlet and corner options than standard. Plan the layout before ordering.
Mixing with standard size
125mm deepflow doesn't join 112mm standard. Use a step adaptor at the junction or upsize the whole run.
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
uPVC deepflow 125mm per metreFloPlast Niagara, Marshall Tufflex
£8–£15
Aluminium deepflow per metrePremium
£22–£45
Cast iron 5" deepflow per metreHeritage equivalent
£55–£100
Brackets and jointsPer fitting
£3–£10
80mm downpipe per metreSized to match deepflow capacity
£10–£20
Install labourPer metre
£25–£50
!
Quote spread is typically ± 18% — always get 3 quotes.
At a glance
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Guttering explained
Deepflow gutters are a deeper-section UK gutter type (typically 125mm) that handles 40–60% more rainwater than standard 112mm. They are required for large roof areas, shallow-pitch roofs, and high-rainfall areas. Expect to pay £8–£15 per metre supply for uPVC deepflow — about 30% more than standard.
What Does the Work Involve?
Install method is identical to standard gutters — brackets at 600mm centres, clipped sections, joint connectors. The difference is the deeper U or square shape that holds more water. Brackets are slightly different to accommodate the depth. Most UK manufacturers offer deepflow alongside standard sizes.
Typical Costs
| Item | Low (£) | High (£) | Notes |
|---|---|---|---|
| uPVC deepflow 125mm per metre | 8 | 15 | FloPlast Niagara, Marshall Tufflex |
| Aluminium deepflow per metre | 22 | 45 | Premium |
| Cast iron 5" deepflow per metre | 55 | 100 | Heritage equivalent |
| Brackets and joints | 3 | 10 | Per fitting |
| 80mm downpipe per metre | 10 | 20 | Sized to match deepflow capacity |
| Install labour | 25 | 50 | Per metre |
| Full house deepflow upgrade | 700 | 1,800 | Typical semi-detached |
How Long Does It Take?
Same as standard gutters — 1–2 days for a semi-detached. No additional time for the deeper profile.
DIY or Professional?
Same as standard gutters. The install procedure is identical.
Choosing the Right Tradesperson
Any guttering contractor fits deepflow — confirm they stock it before signing the quote (some merchants don't carry it). Ask whether they're upsizing the downpipes too — a 68mm downpipe undersizes a deepflow gutter.
UK Regulations
BS EN 12056-3 covers rainwater drainage sizing. The British Standard tables let you calculate the required gutter and downpipe size from roof area and rainfall intensity. Roof areas over 80–100 m² typically need 125mm deepflow. Listed buildings need consent if the look changes (heritage equivalents exist).
Common Problems
- Downpipe undersized: A 125mm deepflow gutter with 68mm downpipes still bottlenecks. Use 80mm or 100mm downpipes.
- Wrong bracket spacing: Deepflow brackets are spaced like standard (600mm) — wider centres sag the heavier weight.
- Limited fittings range: Deepflow has fewer outlet and corner options than standard. Plan the layout before ordering.
- Mixing with standard size: 125mm deepflow doesn't join 112mm standard. Use a step adaptor at the junction or upsize the whole run.
Frequently Asked Questions
When do I need deepflow?
Roof areas over 80 m² per downpipe; shallow-pitch roofs (under 15°) which shed water faster; high-rainfall areas (west Scotland, Lake District, parts of Wales); conservatory roofs which run-off in a concentrated band.
How much more water does deepflow hold?
Roughly 40–60% more than standard 112mm at the same fall. The exact number depends on profile — half-round vs square deepflow have slightly different capacities.
Is deepflow much more expensive?
About 30% more per metre than standard. Total project cost difference for a semi-detached is around £150–£300 — well worth it where capacity is needed.
Can I upgrade just one elevation?
Yes — if only one side has a large roof catchment (e.g. a rear extension). Use a step adaptor at the corner to connect to standard on the lower-load sides.
Does deepflow look bigger from the ground?
Yes — slightly. Most homeowners don't notice. Heritage areas might prefer the standard look or a cast-iron 5" equivalent.
Do deepflow gutters block more easily?
No — actually less. The deeper section means leaves and debris take longer to bridge across, so flow continues longer before a full blockage.
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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