Greater London · England
Window Mastic in Brasted
Our applicators work in Brasted on mastic around window and door frames, sills and patio doors. Old sealant removed completely, joints prepared properly.
- Cracked sealant at the sill ends
- Rain getting in at the frame or under the sill
- Cracked or shrunken mastic around the frame
Why deal with it now?
A quick bead over the top of old mastic looks like an easy fix, but it won’t grip old, dirty sealant. It peels before long, and water still gets in behind. The old mastic has to come out. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in Brasted, the repair is bigger than a sealant job.
A few things move the cost up or down: the old material and how easily it comes out, whether mould needs treating, and whether the work is at height. Your quote takes all of that into account.
Why choose Mr Mastic in Brasted
- Anti-fungal sanitary silicone in wet areas
- Neat joints and a tidy finish
- You choose the colour before work begins
- Homes, businesses and hotels
Read our cost guide or our reviews.
How we handle window mastic in Brasted
From a single sill to a whole house of windows, the work is priced before anything is done. Just ring 0345 464 0079 or drop us an email and tell us how many frames there are and how they’re reached. If you’re dealing with damp patches on the reveal after heavy rain and whistling draughts around closed windows, we can put it right, on window sills, timber windows & doors and composite doors alike.
London homes have every kind of window, from timber sashes in period terraces to aluminium and uPVC in newer blocks. The mastic around them dries out and cracks with age, letting in draughts and water.
We stand behind the work with a one-year guarantee, so you’re not left on your own once the job is done.
- Place
- Brasted (TN16)
- Region
- Greater London
- Cover
- A year, on every job
- Price
- A clear price before work begins
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Common questions in Brasted
Is Brasted in your area for window mastic?
Yes. We work across London and the South East, and Brasted is part of that. Just call 0345 464 0079 or email us with a few details of the job.
Can parking be tricky for a visit in Brasted?
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.
Are you insured?
Yes. Mr Mastic is fully insured, with over 20 years’ experience in sealant work.
Should I try DIY first?
It depends on the job. High-level, external movement and fire-rated joints are professional jobs, while a short indoor joint may be within reach.
Do you take out the old sealant first?
Yes, always, and completely. New silicone does not stick to old silicone, so any old material comes out before anything new goes in.
Can you quote for more than one area?
Yes, we can. More than one area can go on one quote.
When is the sealant fully cured?
Most sealants are touch-dry well before they’re fully cured. We’ll give you the cure time for the product we used.
Are you an approved applicator?
Yes. We hold ARBOMaster approved applicator status.
Frames and glazing around Brasted
London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. In a converted house or block, who looks after the windows depends on the lease, so check that before booking.
Managing a site like Combe Bank School? Then larger buildings have plenty of frames, and the mastic around each one ages. For landlords with property near Dunton Green station, renewing tired window mastic between tenants heads off draught and damp complaints.
Brasted is about 3 miles west of Sevenoaks, in Greater London. Wherever you are in the TN16 postcode area, we cover window mastic for homes and businesses. We cover 764 towns and villages across Greater London. You can also see our page for Crawley, roughly 17 miles from Brasted.
All of TN16 is within our area for window mastic, from the main roads to the quietest streets. You will find streets such as High Street, Station Road and Watermill Close, all of which we cover. Neighbouring places we cover for window mastic include Sundridge (1 mile east), Brasted Chart (1 mile south), Chipstead (2 miles east), Chevening (2 miles north-east) and Bessels Green (2 miles east). We also work in nearby towns such as Orpington (7 miles north), New Cross (15 miles north-west), Thornton Heath (13 miles north-west), Croydon (11 miles north-west), East Dulwich (15 miles north-west) and Plumstead (15 miles north).
Local landmarks in Brasted
In Brasted, that means homes and buildings near The White Hart pub, among other places. For rail, the closest station is Dunton Green station, about 3.1 miles north-east of the centre. A little further out are Sevenoaks Museum (3.8 miles east) and Tandridge Priory (3.8 miles south-west). Green spaces nearby include Betsom's Hill and Dryhill Nature Reserve.
When something else is needed
It helps to know what we cannot do too:
- Penetrating damp from a failed cavity tray or render
- A sash or casement that won’t close properly
- A frame that has rotted at the joint
If in doubt, call 0345 464 0079 or drop us an email and we will say what we think.
Surfaces we seal
- Window sills
- Patio & French doors
- uPVC windows
- Aluminium frames
- Composite doors
- Timber windows & doors
Do you need window mastic in Brasted?
Water runs down the glass onto the sill, so the sill ends and the joint below the frame are common leak points. When that sealant fails, water gets into the wall or under the frame.
Keep an eye out for these signs:
- Old mastic that has gone black or come away
- Damp patches on the reveal after heavy rain
- Leaking joints at the ends of sills
- Gaps left after new windows were fitted
As a London address, Brasted can be tricky for parking: let us know about parking bays, permits or a driveway.
Questions to ask before you book
- How the joint is cleaned and prepared
- Who does the work, and how experienced they are
- Which sealant they’ll use, and why
- What happens if they find a problem under the old sealant
What affects the quote in Brasted
We don’t publish a price list. The quote depends on:
- How many areas need sealing
- Mould in or behind the old joints
- The number and length of the joints
- The type of sealant required
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 we need to know
When you contact us, it’s useful to know:
- Access, such as stairs, a lift or height
- The problem you’ve noticed
- A few photos by email, if you can
- If it’s domestic, commercial or a hotel
Call for a quick quote, or email us if that’s easier. Tell us about the joints that need doing and we’ll talk you through the work before giving you a price.
How it works
The work is kept neat and contained to the area we are working on, so you can get on with your day. The job generally takes a morning for a couple of windows and a door. In a London area like Brasted, the main things to plan are parking and access: let us know about parking, the floor we will be working on and any lift or shared entrance.
- Each frame is looked over and we agree which ones need resealing.
- We remove the old mastic and clean the frame edge and wall.
- Where the gap is deep, backing rod goes in first.
- A flexible exterior sealant is applied in a colour to suit the frame.
- We tool each bead neatly and check every joint is closed.
Before we arrive
- For business premises, tell us about site rules or sign-in
- Tell us about access, such as stairs, a lift or high-level joints
- Mention if the joints have been sealed before
Get a quote
To get a quote, ring 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. You’ll have a clear quote before work begins.
Related advice
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.
Window sills
Sills catch the water running down the glass, so the sill ends and the joint under the frame are vital. Each is cleaned out and resealed.
For landlords and businesses
Failed sealant is one of the commonest items on a check-out report, and it’s quick to put right between tenancies. Several properties can go on one quote.
We regularly work with letting and managing agents. Tell us the address, the job and how access works.