Greater London · England
Window & door mastic in New Malden, Greater London
Window mastic in New Malden from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Sealant in the wrong colour for the frame
- Cold air getting in at the frame edge
- Mastic that’s falling out in pieces
Window mastic in New Malden, done properly
There are two joints on most windows. The external joint is the weather seal; inside, the joint between frame and plaster stops draughts and tidies the reveal. We seal one or both, depending on what’s needed. We work on window sills, uPVC windows and composite doors, and common reasons people get in touch are gaps between the frame and the inside reveal and water coming in at the bottom corners of a door.
London’s Victorian and Edwardian terraces were built with timber sash windows, and many still have them or their replacements. Either way, the mastic between frame and brickwork is what stops draughts and rain getting in, in New Malden as anywhere.
We guarantee the work for a year. If something isn’t right with it in that time, tell us and we’ll put it right.
- Place
- New Malden (KT3, KT1, SW20)
- Wider area
- Greater London
- Guarantee
- One year on every job
- Price
- A clear price before work begins
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
For landlords and businesses
Hotels need rooms back in use, so the work can be planned room by room around your bookings where we can. We’ve worked in hotels as well as homes and businesses.
Letting agents often deal with us directly. Tell us the address, the job and how access works and we will give you a quote.
DIY sealant or a professional job?
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly.
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Honest limits
Honest advice matters more to us than a booking, so here’s what sealant can’t fix:
- Misting between the panes of a double-glazed unit (that needs a new unit)
- A door that needs adjusting, rehanging or new seals
- Rotten timber, which needs a joiner first
Not sure which it is? You can ring 0345 464 0079 or email us and we’ll tell you honestly before booking.
Surfaces we seal
- Composite doors
- Window sills
- uPVC windows
- Timber windows & doors
- Aluminium frames
- Patio & French doors
New Malden questions
Is parking an issue for window mastic in New Malden?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot, so mention what’s available when you book.
Is New Malden in your area for window mastic?
Yes. Our work covers London and the South East, and New Malden is part of that. Just phone 0345 464 0079 or drop us an email with a few details of the job.
Are you an approved applicator?
Yes. We are approved under the ARBOMaster scheme, the approved applicator scheme for Arbo sealants.
Can I add another job to the visit?
Yes. Tell us about everything you’d like done.
Do you work on first-floor windows?
Yes, where they can be reached safely. Let us know about access when you ask for a quote and we will plan for it.
What should I tell you?
Only a few details: where it is, what you’ve noticed and how we reach it. Then phone 0345 464 0079 or send us an email.
Are you fully insured?
Yes. Mr Mastic is fully insured, with over 20 years’ experience in sealant work.
Do you work for landlords and businesses?
Yes, regularly. Several properties can be quoted together.
Why act early in New Malden
Resealing frames is a short job: it takes a few hours for a few frames, or a day or more for a whole house. Wait for damp to appear and there may be plaster and decorating to sort out too. In a flat in New Malden, failed sealant seldom stays inside your own four walls: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
Every job is a little different, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all play a part, and we’ll explain the quote if you ask.
Why book with us
- More than 20 years in sealant work
- Domestic, commercial and hotel work
- You choose the colour before work begins
- We are fully insured
Read how sealant jobs are priced and our reviews.
The process
There is not much for you to do on the day. Show us the job and we will take it from there. The job generally takes most of a day for a typical house, less for a few frames. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in New Malden. It helps if you can point us to a visitor permit or a bay close to the door.
- First we look at every frame and agree the list.
- Next the failed sealant is cut away and the joint cleaned.
- Where gaps are deep, backing rod goes in first.
- A flexible, weatherproof sealant is applied in a colour to suit the frame.
- Every joint is checked before we leave.
Before we arrive
- Keep pets and children clear of the area while we work
- Tell us about access, such as stairs, a lift or high-level joints
- Mention any leaks or damp you’ve noticed
Getting a quote
Need a quote? Please phone 0345 464 0079 or email us and tell us about the job. We’ll explain what we’d do and give you a clear price before we start.
Advice
Window mastic in New Malden: local notes
Historic houses like Southside House (about 1.6 miles north-east) are a reminder that the area around New Malden has older buildings as well as new. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window. In a converted house or block, who looks after the windows depends on the lease, so check that before you book.
New Malden is in London, so parking needs planning: let us know about parking bays, permits or a driveway. For an older house near a landmark such as New Malden Baptist Church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
New Malden is about 3 miles south-west of Wimbledon, in Greater London. Wherever you are in the KT3 postcode area, we can carry out window mastic at your property. Our Greater London coverage runs to 764 places, and New Malden is one of them. You can also see our page for London, roughly 10 miles from New Malden.
Every address in KT3, KT1 and SW20 is within our area for window mastic. Local streets include High Street, Ashcombe Square and Melrose Gardens, all of which we cover. Main roads around New Malden include the B283, which makes travel easy. We also cover 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).
Near you in New Malden
In New Malden, that means homes and buildings near Beverley Park, The Glasshouse pub and Holy Cross School, among other places. New Malden has its own railway station: New Malden station. Well-known places in the area include Chessington Castle Hill (3.3 miles south) and Bentall Centre (1.9 miles west). Green spaces nearby include Rose Walk and Kingston Hill Road area.
Places near New Malden
Also in New Malden
Different surfaces, different methods
Aluminium frames
Bi-fold and sliding aluminium doors have long frame joints, and the bottom joint sees the most water. Each is cleaned, backed where deep and resealed.
Patio & French doors
Door frames take knocks and movement every time the doors are used. A flexible sealant copes with that without cracking.
When to call us in New Malden
On timber frames, paint and putty build up around the joint. Mastic painted over many times cracks with the paint, and timber moves with moisture as well as temperature.
The most common problems we see are:
- Gaps where the sill meets the wall
- Cold air getting in at the frame edge
- Rain getting in at the frame or under the sill
- A bead that doesn’t match the frame
Letting a property close to New Malden station? Then cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
What to look for in a quote
- How the colour is chosen
- Which sealant they’ll use, and why
- How long to leave it before use
- What preparation is included