Greater London · England
Brasted Chart Window Mastic
Window mastic for Brasted Chart and the surrounding area: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Gaps where the sill meets the wall
- Mastic that has split away from the wall
- Cold air getting in at the frame edge
Window mastic in Brasted Chart
Some gaps around frames are far deeper than they look. Packing it solid with sealant gives a joint that can’t flex, so deep gaps get backing rod first. That way the new bead bonds to the frame and the wall only. If you are dealing with cold air getting in at the frame edge and mastic that has split away from the wall, we can help, whatever the surface.
From mansion-block windows to modern glazing in new flats, London has every kind of frame. Over the years, the sealant around them shrinks, cracks and pulls away, which is when draughts and damp patches appear in homes in Brasted Chart.
We stand behind the work with a one-year guarantee, so you are not left on your own once the job is done.
- Place
- Brasted Chart (TN16)
- Region
- Greater London
- Guarantee
- A year, on every job
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
DIY versus a professional finish
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
A DIY attempt doesn’t rule out a professional job. We cut it out and start again, so tell us about it when you ask for a quote.
Looking after it afterwards
After the cure time, these simple habits help:
- Keep paint and stain on wooden frames in good order
- Clean frames with a soft cloth and soapy water
- Paint up to the joint, not over it
- Air rooms to keep condensation down around windows
Most silicone sealants will not take paint, so if you are planning to paint the frames or walls, tell us beforehand. We can use a paintable sealant where that matters.
On timber windows, water behind the joint can lead to rot. Once wood has rotted, it needs repair before it can be sealed, so early resealing is worth it.
Windows and doors in Brasted Chart
With historic houses such as Quebec House (about 1.2 miles west) nearby, there’s older building stock in the area around Brasted Chart as well as newer homes. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic. In a converted house or block, who looks after the windows depends on the lease, so it’s worth checking before booking.
Homes close to Church of St Martin include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame. If you let a flat or house near Sevenoaks station, cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
Brasted Chart is about 4 miles west of Sevenoaks, in Greater London. Every kind of property in Brasted Chart is covered for window mastic. Every job comes with our one-year guarantee. Across Greater London, we cover 764 places, Brasted Chart among them. Crawley is on our list too, around 16 miles away.
Postcode districts we cover here for window mastic: TN16. That includes homes and businesses on Chart Lane and Pipers Lane and the roads around them. Other places close to Brasted Chart include Brasted (1 mile north), Toy's Hill (1 mile south), Sundridge (1 mile north-east), Ide Hill (2 miles south-east) and Goathurst Common (2 miles south-east). We also work in nearby towns such as Orpington (8 miles north), Thornton Heath (13 miles north-west), Croydon (11 miles north-west), Streatham (15 miles north-west), Bromley (10 miles north) and West Norwood (14 miles north-west).
What’s near Brasted Chart
Brasted Chart’s nearest station is Sevenoaks station, about 3.6 miles east of the centre. A little further out are Tandridge Priory (3.3 miles west). Open spaces near Brasted Chart include Betsom's Hill and Dryhill Nature Reserve.
What we do, step by step
On the day, we look over the joints with you first. We protect the surfaces around the joints before any work begins. The work generally takes a few hours for a few frames, or a day or more for a whole house. In Brasted Chart, flats, stairs and shared entrances are part of the routine. Mention any building rules, key holders or managing agents when you book.
- 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
- Move anything stored near the joints
- Tell us about any previous sealing or DIY attempts
- Tell us if parking is tricky
Getting a quote
Getting a quote is simple: let us know what needs doing and where. Photos by email help us understand the job, and we will take it from there.
Related advice
What affects the cost of window mastic
Your quote is based on your job. We look at:
- The old material and how stubborn it is
- How much there is to do
- How many areas need sealing
- Whether there’s mould to deal with
Homes and businesses are quoted the same way: the amount of work, the access and the products needed, along with when we can work on site. Ask us for a quote and we’ll go through it with you.
Asking for a quote
Photos by email are helpful but not essential. Try to tell us:
- Where the job is, and your postcode
- The type of property
- What’s wrong with the joints now
- A few pictures by email, if you can
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and email photos if that’s easy.
Places near Brasted Chart
More services for Brasted Chart
Different surfaces, different methods
uPVC windows
uPVC expands and contracts noticeably with temperature, so we use a flexible, low-modulus sealant. White is the usual colour, with brown, anthracite grey and black for coloured frames.
Composite doors
Draughts round the door leaf normally come from worn seals or adjustment, not the mastic. We seal the frame and let you know about anything else.
Do you need window mastic in Brasted Chart?
Joints that are too thin or too deep fail early. A thin smear across a wide gap has nothing to it, and a gap filled solid cannot flex. That is what backing rod is for.
Signs it’s time to call us include:
- Gaps where the sill meets the wall
- Mastic that has split away from the wall
- Gaps between the frame and the inside reveal
- Sealant in the wrong colour for the frame
As a London address, Brasted Chart can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Questions to ask before booking
- How much experience the applicator has
- How long the guarantee is
- How long to leave it before use
- What insurance they hold
Questions from Brasted Chart
Is Brasted Chart in your area for window mastic?
Yes, Brasted Chart is within the area we cover. We work across London and the South East. Just ring 0345 464 0079 or drop us an email with a few details of the job.
Do you work for landlords with property near Sevenoaks station?
Yes. We work for landlords and letting agents as well as homeowners. Just ring 0345 464 0079 or send us an email with the address and what needs doing, and we will give you a clear price.
Are you ARBOMaster approved?
Yes. We’re an ARBOMaster approved applicator, the approved applicator scheme for Arbo sealants.
How long will my window job take?
Allow a morning for a couple of windows and a door. Access and how stubborn the old mastic is affect the time most.
When is the sealant fully cured?
Different products cure at different speeds, so please follow the time we give you.
Can you quote for more than one area?
Yes. Just list everything you need and we will quote it together.
Where are you based?
Mr Mastic is based in Crawley. We cover Brasted Chart and the rest of Greater London, along with the rest of our area.
Can you match the sealant to my frames?
Yes, we choose a colour to suit the frame. Grey and black frames get grey or black sealant, and wood-effect frames usually suit brown.
Landlords, agents and businesses in Brasted Chart
If you manage several properties in or around Brasted Chart, several properties can go on one quote. Send us the addresses and the work at each.
We also work for property managers and facilities teams in Brasted Chart and across Greater London. Several sites can go on one quote.