Greater London · England
Gutter, fascia & soffit sealing in Roundshaw, Greater London
Sealing leaking gutter joints, end caps, fascias, soffits and roofline trims for Roundshaw, backed by a 12-month guarantee. Ask us for a quote.
- Drips from gutter joints and end caps
- Damp on an inside wall under a dripping gutter
- Quick sealant fixes on gutters that didn’t last
Work for landlords, hotels and businesses
We also work for property managers and facilities teams in Roundshaw and across Greater London. We can quote a run of properties together.
Failed sealant is one of the commonest items on a check-out report. Several properties can go on one quote.
Gutter sealing for homes and businesses in Roundshaw
A lot of gutter leaks come down to one tired joint. The joint is cleaned, dried and resealed with a sealant made for guttering. If the gutter itself has failed, we say so. We work on soffit joints, garage door frames and roofline trims, and common reasons people get in touch are garage door frames letting rain in and water running down the wall below the gutter.
Modern London flats rely on sealed movement joints and cladding joints. Period houses have different weak points, such as gutter joints, trims and the line where an extension meets the old wall.
There’s a 12-month guarantee on every job, large or small.
- Where
- Roundshaw (SM6, CR8, CR0)
- Wider area
- Greater London
- Cover
- One year on every job
- Price
- A clear price before we start
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Leave it or put it right?
Replacing fascias because of open joints is generally unnecessary. Sealing the joints tidies them up if the boards are sound. In London conversions, one flat’s bathroom is often above another flat’s ceiling, and a slow leak from a failed seal can end up in the flat below. Putting it right early is much less trouble.
The cost reflects the work involved, not a rough estimate. That is why we ask a few questions first and agree the price before starting.
What you get with us
- White, clear, grey or coloured to suit, where the product allows
- 20+ years of sealant experience
- Sealant colour chosen to suit
- Arbo and Everbuild products
See our cost guide and our reviews.
Walls and rooflines in Roundshaw
Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. London terraces and converted houses often share gutters, downpipes and walls, so check who is responsible for the outside before booking.
Homes close to St. Paul's include some older properties, and the joints between older walls, newer extensions and the roofline need a sealant that can move. If you let a flat or house near Wallington station, leaking gutter joints on a rental are best caught before they stain the walls.
Roundshaw is about 2 miles south-west of Croydon, in Greater London. Every kind of property in Roundshaw can book us for gutter sealing. The work is guaranteed for a year. Roundshaw is one of 764 towns and villages in Greater London where we work. You can also see our page for London, about 10 miles away.
Jobs for gutter sealing in SM6, CR8 and CR0 is quoted and booked the same way as anywhere else. Local streets include Link Lane, Milton Road and Redwing Road. Neighbouring places we cover for gutter sealing include Russell Hill (1 mile east), Bandonhill (1 mile north), Peaks Hill (1 mile south), Waddon (1 mile north-east) and Wallington (1 mile north-west). We also work in nearby towns such as London (10 miles north), City of Westminster (11 miles north), Marylebone (11 miles north), Kensington (11 miles north), St Pancras (12 miles north) and Shoreditch (12 miles north).
Landmarks near Roundshaw
In Roundshaw, that means homes and buildings near Wilson's School, Waddon Ponds and The John Fisher School and the streets around them. For rail, the closest station is Wallington station, roughly 0.9 miles north-west of the centre. Well-known places in the area include Purley War Memorial Hospital (1.2 miles south-east) and Croydon Airport Visitor Centre (0.6 miles east). Green spaces nearby include Roundshaw Downs and Duppas Hill.
Towns and villages near Roundshaw
Also in Roundshaw
Surface by surface
Roofline trims
Sealing roofline trims is joint work only. A roofer deals with the roof itself.
Gutter end caps
End caps take the pressure of water running along the gutter. A failed seal makes them leak.
Do you need gutter sealing in Roundshaw?
Sealant laid on a wet or dirty joint fails early. Some quick repairs peel off within a season or two for this reason.
Look out for these signs:
- Failed sealant on a garage door frame
- Open joints in fascias and soffits
- Water dripping where gutter sections meet
- Old sealant on roofline trims that has split
Roundshaw is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Before booking anyone
- How the colour is chosen
- How the joint is cleaned and prepared
- How much experience the applicator has
- Is the old sealant removed completely?
Your questions about gutter sealing in Roundshaw
Do you work for landlords with property near Wallington station?
Yes, rental work is part of what we do. Just phone 0345 464 0079 or send us an email and tell us about the property, and we’ll give you a clear quote.
Is parking an issue for gutter sealing in Roundshaw?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. That way the visit can be planned around it.
Can you work on commercial sites?
Yes. We work in offices, washrooms, hotels and other commercial premises. We can talk about working times when we quote.
Is gutter cleaning part of the job?
We clear what’s around the joints we work on. Full gutter cleaning is a separate job.
How much does gutter sealing cost in Roundshaw?
Every job is different, so each one gets its own quote. For a quick quote, ring 0345 464 0079 or email us with a short description of the job.
What do you need from me for a quote?
The location, the problem and the rough size of the job. Photos by email help too.
Should I try DIY first?
That depends on the joint. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional, while a short indoor joint may be within reach.
Where is Mr Mastic based?
We work from Crawley. Our applicators cover Roundshaw.
What affects the quote in Roundshaw
Some jobs are bigger than they look, and some smaller. The main factors:
- Mould in or behind the old joints
- Which sealant suits the joint
- Whether the work is at height
- How many rooms, windows or areas are involved
Instead of a standard rate, we price the job in front of us: how many joints, what’s in them now and how we reach them. You will know the price before we begin.
Helping us quote
Photos by email are helpful but not essential. Try to tell us:
- If it’s domestic, commercial or a hotel
- The problem you’ve noticed
- How we’d reach the joints
- If someone has resealed it before
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and email photos if that is easy.
How it works
Most of a good job is in the preparation, and we do not rush it. Every joint is cleaned and dried before new material goes in. In total, it normally takes a few hours, depending on the number of joints and the access. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. Mention any building rules, key holders or managing agents when you book.
- We find where the water is coming from and check the gutter is sound.
- The old sealant and dirt are cleaned out of the joint.
- We dry the joint so the new sealant can bond.
- A gutter sealant is applied to the joint.
- We check the run and clear debris near the joints.
Preparing for the visit
- Clear items away from the joints we’re working on
- Let us know about stairs, lifts or work at height
- Keep children and pets away from the work area
Get a quote
To get a quote, call 0345 464 0079 or send us an email with the location and a short description of the problem. You will have a clear quote before any work starts.
Advice
Looking after it afterwards
Good habits help new joints last longer. A few tips:
- Look at the gutters while it’s raining
- Keep downpipes clear
- Get a dropping gutter looked at quickly
- Get leaks sealed before the wet months
If a gutter starts to sag, get the brackets looked at. Movement will pull the joints open again.
A drip from a gutter joint will not stop on its own. Water keeps hitting the same part of the wall and that can cause damp inside.