Greater London · England
Gutter, fascia & soffit sealing in New Malden, Greater London
Gutter sealing for New Malden, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Old sealant on roofline trims that has split
- Old gutter sealant that has let go
- Rain getting in around a garage door
For landlords and businesses
Landlords and letting agents in New Malden can book us as well as householders. Sealant work between tenants keeps a property looking cared for.
We also work for property managers and facilities teams in New Malden and across Greater London. Several sites can be quoted together, and we’re fully insured.
How we handle gutter sealing in New Malden
Open fascia and soffit joints spoil the roofline and can let weather in. They’re sealed in a matching colour where one is available. If you have end caps that drip every time it rains and open joints in fascias and soffits, 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 one failed joint can cause damp for more than one household. For a flat in New Malden, check the lease for who looks after the outside.
We stand behind the work with a one-year guarantee.
- Location
- New Malden (KT3, KT1, SW20)
- Region
- Greater London
- Guarantee
- A year, on every job
- Quotes
- A clear price before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Places near New Malden
Also in New Malden
Looking after it afterwards
So the new joints stay in good condition:
- Have sagging gutters refixed early
- Clear leaves and moss from the gutters
- Check fascia and soffit joints for gaps
- Do not lean ladders against the gutter itself
Give the sealant the cure time we tell you before poking or cleaning near it.
Split sealant on fascias and trims lets water in behind. Sealing it early keeps the boards behind dry.
When something else is needed
We’d rather tell you now than do work that won’t last, so here’s what sealant can’t put right:
- Rotten or damaged fascia boards
- Brackets that have snapped or loosened
- Roof leaks, slipped tiles or failed flashing (a roofer’s job)
If in doubt, phone 0345 464 0079 or drop us an email and we will say what we think.
Where we work in New Malden
- Roofline trims
- Soffit joints
- Gutter joints
- uPVC fascias
- Garage door frames
- Gutter end caps
Outside joints around New Malden
London terraces and converted houses often share gutters, downpipes and walls, so check who is responsible for the outside before booking. With historic houses such as Southside House (about 1.6 miles north-east) nearby, there’s older building stock in the area around New Malden as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth.
Rented homes near New Malden station change hands often, and a dripping gutter joint or loose fascia trim is easy to miss until damp shows inside. As a London address, New Malden can be tricky for parking: let us know about parking bays, permits or a driveway.
New Malden is about 3 miles south-west of Wimbledon, in Greater London. Whether you’re in the middle of New Malden or further out, we cover gutter sealing for every kind of property, from flats and houses to offices and hotels. Across Greater London, we cover 764 places, New Malden among them. Our London page covers work nearby.
Every address in KT3, KT1 and SW20 is covered for gutter sealing, from the main roads to the quietest streets. You will find streets such as High Street, Ashcombe Square and Melrose Gardens. New Malden is on the B283, so it’s easy for us to get to. Neighbouring places we cover for gutter sealing include Motspur Park (1 mile north-east), West Barnes (1 mile east), Norbiton (1 mile north-west), Coombe (1 mile north) and Raynes Park (1 mile east). Larger places within reach include London (10 miles north-east), City of Westminster (9 miles north-east), Marylebone (9 miles north-east), Kensington (7 miles north), St Pancras (11 miles north-east) and Shoreditch (12 miles north-east).
Around New Malden
Around New Malden, our work takes us to homes and buildings near Beverley Park, The Glasshouse pub and Holy Cross School and the streets around them. There’s a railway station in New Malden itself: New Malden station. Well-known places in the area include Chessington Castle Hill (3.3 miles south) and Bentall Centre (1.9 miles west). The countryside around New Malden includes Rose Walk and Kingston Hill Road area.
What we do, step by step
The work is kept neat and contained to the joints we’re treating. Expect the work to take an hour or two for a few joints, longer for a full run. For a job in New Malden, parking and access are the things to plan: tell us about permits, visitor bays or off-street space, which floor we are working on and whether there’s a lift.
- First we trace the drip and check the gutter isn’t damaged.
- 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.
How to prepare
- Let us know about earlier repairs to the joints
- Plan for the work area to be out of bounds to pets and children
- Tell us about any water getting in
Get a quote
Every job is quoted individually, so the first step is telling us about yours. Just call 0345 464 0079 or drop us an email with the details.
Read more
Common problems we fix in New Malden
Leaves and moss hold water in the gutter. Water that cannot drain works its way through a weak joint and leaks out.
The problems people usually mention when they call include:
- Gaps along fascia and soffit joints
- Old sealant on roofline trims that has split
- Wet patches on the wall under a gutter joint
- Dripping gutter ends
For site and facilities teams at buildings such as Christ Church New Malden CofE Primary School, larger buildings have long runs of movement joint that eventually need resealing.
What to look for in a quote
- How hidden problems are handled
- Who does the work, and how experienced they are
- What preparation is included
- What guarantee comes with the work
Quotes for gutter sealing in New Malden
We don’t publish a price list. What we look at:
- The type of sealant required
- How much old sealant there is and how hard it is to remove
- Any mould that needs treating
- Whether the work is at height
The cost reflects the work involved, not guesswork. That’s why we ask a few questions first and agree the price before starting.
What to tell us for a quote
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- Whether it’s a home or a business
- Photos by email, if that is easy
- What the problem is, such as mould, gaps, leaks or cracking
- Any access issues, like height or stairs
Need a quote? Please phone 0345 464 0079 or drop us an email and tell us about the job. We will explain what we’d do and send you a clear quote before any work starts.
Common questions in New Malden
Do you work for landlords with property near New Malden station?
Yes. We work for letting agents and landlords as well as householders. You can call 0345 464 0079 or email us with the details for a clear quote.
Can parking be tricky for a visit in New Malden?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. The visit is then planned around what’s available.
What sealant do you use?
Each joint gets the product that suits it. Movement, water and weather all affect the choice, and we’ll explain our choice.
Can you work on commercial sites?
Yes, regularly. We can plan bigger jobs in stages to suit the site.
Will the old sealant be removed?
Yes. We cut out all the old sealant and clean the joint before resealing.
Where is Mr Mastic based?
We are a Crawley-based firm, with over 20 years’ experience. Our area covers South East England, London and Scotland.
Can you reach high gutters?
Low gutters are simple to reach. For higher work, tell us about access and we will confirm what’s needed.
Is it worth trying it myself?
You can, for simple jobs. Preparation is everything: all the old sealant out, and a clean, dry joint. If it does not work out, we can redo it.
Surface by surface
Garage door frames
Resealing a garage door frame keeps rain and draughts out.
Gutter end caps
End caps take the pressure of water running along the gutter. When their seal fails, they drip.