Greater London · England
Gutter, fascia & soffit sealing in Barnes, Greater London
Gutter sealing for Barnes, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Damp patches inside below a leaking gutter
- Open joints in fascias and soffits
- Streaks down the brickwork from a leaking joint
Gutter sealing for homes and businesses in Barnes
Failed sealant round a garage door frame lets rain blow in. We cut out the old sealant and reseal the frame using a sealant made for outdoor use. If you have cracked sealant along roofline trims and failed sealant on a garage door frame, we can put it right, whatever the surface.
In London terraces and converted houses, gutters and walls are often shared with the house next door, so a leaking gutter joint or failed wall joint can affect more than one home. In a converted house in Barnes, it’s worth checking who is responsible for the outside before booking.
We stand behind the work with a 12-month guarantee, so you’re covered after we have gone.
- Where
- Barnes (SW13, SW15, SW14)
- Region
- Greater London
- Cover
- A year, on every job
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Common questions in Barnes
Do you cover Barnes for gutter sealing?
Yes, Barnes is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or send us an email and let us know what needs doing, and we will send you a clear quote.
I let a flat near Barnes Bridge station. Can you help?
Yes, we work for landlords and agents. Just ring 0345 464 0079 or drop us an email and tell us about the property, and we’ll send you a clear quote.
How long before the joint can be used?
Cure times vary by product and the conditions. We tell you how long to leave it before we go.
Do I need to be at home?
It depends on the job. Inside work needs someone to give us access.
Do you replace gutters or fascias?
No. We seal joints and replacement is a job for an installer.
Will the old sealant be removed?
Yes, always, and completely. New sealant will not bond properly to old, so any old material comes out before anything new goes in.
Are you ARBOMaster approved?
Yes. We are ARBOMaster approved, the scheme for applicators of Arbo sealants.
Where is Mr Mastic based?
We are based in Crawley, and we work across South East England, London and Scotland.
How we quote for gutter sealing
Some jobs are bigger than they look, and some smaller. What affects the quote:
- How many areas need sealing
- Whether there’s mould to deal with
- The number and length of the joints
- Working hours on commercial sites
Doing several joints on one visit is usually more efficient than separate visits, so it’s worth mentioning everything you’d like done. You’ll get one clear quote for the whole job.
What to tell us for a quote
To make quoting easier, let us know:
- How many joints, rooms or windows are involved
- Photos by email, if that is easy
- The address or postcode of the job
- What’s wrong with the joints now
Every job is quoted individually, so start by telling us what you need. Just ring 0345 464 0079 or email us with the details, and photos are welcome.
DIY versus a professional finish
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
What we’re called out for in Barnes
Gutter joints depend on seals that wear out. Temperature changes make gutters move and that movement opens up tired joints.
Look out for these signs:
- Rain getting in around a garage door
- Internal damp traced to a gutter joint
- Fascia boards with gaps between them
- Wet patches on the wall under a gutter joint
Schools such as St Osmund's Catholic Primary School are buildings too, and larger buildings have long runs of movement joint that eventually need resealing.
What to look for in a quote
- What the quote includes, VAT included or not
- What the cure time is
- Who turns up on the day
- Whether you can choose the colour
What we do, step by step
Our applicators work methodically: protect, prepare, seal, tidy. For most jobs that takes a few hours, depending on the number of joints and the access, and the area is left clean. In Barnes, flats, stairs and shared entrances are part of the routine. Mention any building rules, key holders or managing agents when you book.
- We look at the gutters, fascias and trims and agree the joints to seal.
- Each joint is cleaned and any old sealant removed.
- The joints are dried.
- The sealant is applied and finished.
- We check our work before we leave.
How to prepare
- Keep pets and children clear of the area while we work
- Tell us about access, such as stairs, a lift or high-level joints
- Try not to wet indoor joints just before the visit
Get a quote
Call for a quick quote, or email us if that’s easier. Describe what needs sealing and we’ll explain what’s involved.
Related advice
How the job changes by surface
uPVC fascias
We seal fascia joints, not replace the boards. If boards are damaged, we will tell you.
Soffit joints
Open soffit joints let draughts in. A neat seal closes them.
Landlords, agents and businesses in Barnes
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
For anyone letting property in or around Barnes, several properties can be quoted together. Send us the addresses and the work at each, and pictures by email help.
What gutter sealing looks like in Barnes
London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. Historic houses like Chiswick House (about 0.9 miles north-west) are a reminder that the area around Barnes has older buildings as well as new. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth.
For an older house near a landmark such as Barnes Methodist Church, an extension built onto an older house moves differently, and the joint between them takes the strain. For landlords with property near Barnes Bridge station, leaking gutter joints on a rental are best caught before they stain the walls.
Barnes is about 2 miles west of Fulham, in Greater London. From the centre of Barnes to the outskirts, gutter sealing is available for homes and businesses alike, from flats and houses to offices and hotels. Barnes is one of 764 towns and villages in Greater London where we work for gutter sealing. You can also see our page for London, roughly 7 miles from Barnes.
Here we cover the SW13, SW15 and SW14 postcode area for gutter sealing. Whether your property is on Church Road, Station Road and Barnes High Street or anywhere close by, we can help. Main roads around Barnes include the A306 and B349. Close by, we work in Old Chiswick (1 mile north), Turnham Green (1 mile north-west), Mortlake (1 mile south-west), East Sheen (1 mile south-west) and Putney (1 mile south-east). Further out, we also cover London (7 miles east), City of Westminster (5 miles north-east), Marylebone (5 miles north-east), Kensington (3 miles north-east), St Pancras (7 miles north-east) and Shoreditch (8 miles north-east).
Around Barnes
Around Barnes, our work takes us to homes and buildings near Chiswick School, Sun Inn and Barn Elms. Nearby too are Polish Library POSK in London (1.4 miles north) and The Harrodian School (0.6 miles north). Barnes has its own railway station: Barnes Bridge station. Other landmarks nearby include Barnes Hospital (0.7 miles south-west) and Putney Exchange (1.4 miles south-east). Open spaces near Barnes include Richmond Hill and Kew Gardens Lake.
Why act early in Barnes
A new garage door isn’t needed for a leaking frame. Resealing the frame joint is often enough. In a flat in Barnes, failed sealant seldom stays inside your own four walls: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
There are no prices on our website, because each job is priced on what it involves. For a quick quote, please call 0345 464 0079 or drop us an email and we’ll talk you through it.
Why choose Mr Mastic in Barnes
- Full insurance on every job
- Colour picked to suit the job
- Trusted Arbo and Everbuild sealants
- Every job guaranteed for a year
See our cost guide or our reviews.