Gutter cleaning & rainwater clearance

Gutter cleaning and rainwater clearance: the full guide

Gutters, hoppers, outlets and downpipes carry rain off the building. When they block, water backs up, overflows and finds its way into walls, soffits and flat roof decks. Most of the damp problems we are asked to look at on commercial buildings start with a blocked outlet that nobody could see from the ground.

This guide covers what a gutter clean from SeeForth involves, how often buildings in London, Essex, Hertfordshire and Cambridge need it, the rules we work to, what affects the price, and the questions property managers ask us most.

What the service involves

Every visit follows the same sequence.

1. Survey and RAMS. We look at the roofline, the access options and anything that could fall on people below. A site-specific risk assessment and method statement is issued before anyone goes up.
2. Access. We pick the method that suits the building. That may be rope access from tested roof anchors, a mobile elevating work platform (MEWP) from the ground, or a high-reach gutter vacuum operated from a safe position. Scaffolding is rarely needed.
3. Clearance. Leaves, silt, moss, nesting material and rubbish are removed by hand and by vacuum. Outlets, dome strainers, leaf guards and hopper heads are cleared and refitted where they have moved.
4. Flow check. Where water is available we flush each run to confirm the outlet and downpipe are free-flowing all the way down, rather than clear at the top and blocked at the bend.
5. Report. You receive before and after photographs of every gutter run and outlet, with any defects flagged. Cracked joints, loose brackets, split downpipes and ponding on flat roofs are noted so you can plan repairs.

We clear balcony channels, parapet gutters, valley gutters, box gutters, flat roof outlets and hopper heads as well as standard eaves gutters. Waste is bagged and taken off site.

How often gutters need clearing

Twice a year is the usual starting point for a commercial or residential block. One visit after the autumn leaf fall, and one in spring to clear winter silt and any moss that frost has brought down off the roof. Some buildings need more than that.

• Buildings next to mature trees, especially planes, limes and sycamores, often need a third visit in late autumn.
• Flat roofs with dome strainers silt up faster than pitched roofs and benefit from a check every quarter during leaf fall.
• Balcony channels on student and residential blocks collect wrappers, bottle caps and cigarette ends as well as leaves, and can block within a few months.
• Buildings with a history of internal leaks should be cleared before the wettest months rather than after them.

At Brunswick House in Cambridge, a multi-storey residential building we look after under a two-year planned maintenance contract, our March 2026 report recommended a higher clearance frequency during autumn leaf fall because we found standing water in the balcony channels. Read the Brunswick House case study.

Standards and safety

Gutter clearance is work at height, and we plan it under the Work at Height Regulations 2005. We follow the hierarchy of control. Where a vacuum from the ground will do the job, nobody leaves the ground. Where it will not, we use a MEWP or rope access. We do not use ladders for anything more than a quick look.

• Our rope access technicians are IRATA trained and always work in pairs, with a rescue plan in place.
• Roof anchors and eyebolts are checked for a current test certificate before any rope is rigged. If certificates have lapsed we can carry out eyebolt testing on the same visit.
• Exclusion zones are set up at ground level and building users are told which elevations are being worked on and when.
• Waste is not left in the gutter or thrown to the ground. It is bagged at height and lowered.

What affects the price

We quote per building after a survey. These are the things that move the price.

• Height and access. A three-storey block that a vacuum can reach from the ground costs less than a tower that needs rope access from the roof.
• Length of gutter run. Long balcony channels across four elevations take longer than a single eaves gutter.
• Condition. A gutter that has not been touched for years holds compacted silt and moss that has to be dug out rather than vacuumed.
• Frequency. A planned maintenance contract with two or three visits a year is priced lower per visit than a one-off emergency clear.
• Extras. Refitting displaced dome strainers, replacing leaf guards or rodding a blocked downpipe are quoted separately when they are needed.

Send us the address and a photo or two of the roofline and we will come back with a price. For portfolios we can price every building in one schedule.

Where we work

We clear gutters and rainwater goods across Greater London, Essex, Hertfordshire and Cambridge. Most of our clients are facilities managers, managing agents and property managers looking after several buildings, and we schedule visits across a portfolio so that every building is cleared before the leaf fall rather than after the first leak.

Gutter cleaning questions

How often should commercial gutters be cleaned?

Twice a year suits most buildings, once after the autumn leaf fall and once in spring. Buildings close to large trees, flat roofs with dome outlets and balcony channels on residential blocks often need a third visit.

Do you need scaffolding to clean high gutters?

Very rarely. We use rope access, MEWPs and high-reach gutter vacuums, which reach gutters on towers, atriums and awkward rooflines without scaffold. That keeps the cost down and the job to a day or two rather than weeks.

Can you clear outlets on a flat roof?

Yes. Flat roof outlets, dome strainers and internal rainwater pipes are the most common cause of the leaks we see. We clear the silt around each outlet, clean and refit the strainer and check the surrounding membrane.

What happens to the waste?

It is bagged at height, lowered to the ground and taken away with us. Nothing is left on the roof or in the car park.

Do you repair gutters as well as clear them?

We photograph and flag every defect we find, such as cracked joints, loose brackets and split downpipes, and we can quote for the repairs. See our roof repairs service.

What proof do I get that the work was done?

A photo report showing every gutter run and outlet before and after, with any defects and recommendations for the next visit. Managing agents use it to show leaseholders and insurers that the building is being maintained.

Can you work while the building is occupied?

Yes. Almost all of our gutter work is on occupied buildings. We fence off the ground below each elevation, tell residents or staff which areas are in use, and keep noise to a minimum.

Do you offer planned maintenance contracts?

Yes. Many of our gutter clients are on one, two or three-year contracts with fixed visits each year. The Brunswick House contract in Cambridge is an example. Contracts are priced per visit and include the photo report.

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