Kent · England
Postling Green Window Mastic
We cover Postling Green for mastic around window and door frames, sills and patio doors. Old sealant removed completely, joints prepared properly and every job guaranteed for a year.
- Untidy mastic left by window fitters
- Rain getting in at the frame or under the sill
- Mastic that is falling out in pieces
Window mastic for homes and businesses in Postling Green
Over two decades of sealing frames has taught us which products suit which walls. We are fully insured ARBOMaster approved applicators, and every job is covered by a 12-month guarantee. We’re often asked to deal with cold air getting in at the frame edge and mastic that has split away from the wall, across timber windows & doors, window sills and composite doors.
Around Postling Green, many homes face open ground, so their windows and doors take the full weather. That exposure dries out and cracks the mastic around frames and sills faster.
We stand behind the work with a one-year guarantee, so you’re covered after we’ve gone.
- Place
- Postling Green (TN25)
- Region
- Kent
- Cover
- One year on every job
- Price
- A clear price before work begins
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
DIY versus a professional finish
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it doesn’t work out, we can still put it right.
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
Common problems we fix in Postling Green
Every frame moves through the day. Sun on a frame makes it expand, and it contracts again overnight, while the masonry beside it stays put. If the sealant cannot stretch, it splits.
Common reasons people contact us are:
- Rushed sealant from a window installation
- Hard, cracked sealant around windows
- Water coming in at the bottom corners of a door
- Black, perished sealant on frames
If you look after a building such as Aldington Primary School, its window and door frames need their mastic kept sound, just like a home’s.
What to look for in a quote
- What preparation is included
- What happens if they find a problem under the old sealant
- What the quote includes, VAT included or not
- How long the guarantee is
What we do, step by step
At the end, we look at the finished work together and tell you how long to leave it. The work normally takes a few hours for a few frames, or a day or more for a whole house, depending on the size of the job. For a village or hamlet like Postling Green, the journey is planned in advance: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- First we look at every frame and agree the list.
- The old mastic is cut out and the surfaces cleaned back.
- Deep gaps are filled with backing rod to set the depth.
- New exterior sealant goes on in a matching colour and is tooled smooth.
- Finally we tidy up and check each joint.
Before we arrive
- Mention any tricky access
- Let us know about earlier repairs to the joints
- Let us know if you’ve seen damp or leaks
Ask for a quote
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and email pictures if that is easy.
Related advice
Looking after it afterwards
Once the sealant has cured, a few habits help it last:
- Do not aim a pressure washer at the joints
- Keep drainage slots and sill grooves clear
- Keep timber frames painted
- Ventilate rooms so frames do not stay wet inside
Check the drainage slots in the frames aren’t blocked, so water can run away instead of sitting against the joint.
Wet, windy weather is when failed mastic shows itself, but sealant goes on best when frames and walls are dry. Sorting cracked mastic early means the joint is sound before the bad weather.
Why act early in Postling Green
Draughts and leaks do not always mean new windows. If the frames and glass are in good order, resealing the joints is often all that’s needed. Problems with the glass or gaskets are for a window company, and we will say so. In a small place like Postling Green, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
What you pay reflects the work, not guesswork. That’s why we ask a few questions first and agree the price before starting.
Why us?
- Full insurance on every job
- You choose the colour before work begins
- 180+ five-star Google reviews
- Anti-fungal silicone where joints get wet
Take a look at how sealant jobs are priced and what customers say.
Postling Green: your questions answered
I let a flat near Westenhanger station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. You can call 0345 464 0079 or send us an email with the details for a clear quote.
Do you cover smaller places like Postling Green?
Yes, Postling Green is covered. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Where do you work from?
Our base is in Crawley, and we work across South East England, London and Scotland.
What does window mastic cost?
We do not publish prices, because the cost depends on the job: how much there is, what’s there now, how we reach it and what it needs. You’ll get a clear quote before work begins.
Do you remove the old sealant?
Yes. We cut out all the old sealant and clean the joint before resealing.
How long does it take to reseal the windows on a house?
A handful of frames is a short visit, while a whole house takes longer. You will get a timescale with the quote.
Can I do it myself?
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 have sealant for grey or black windows?
Normally, yes. Mention the frame colour when you ask for a quote and we’ll match it as closely as we can.
Window mastic in Postling Green: local notes
Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. With historic houses such as Westenhanger Castle (about 3.2 miles east) nearby, there’s older building stock in the area around Postling Green as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
For an older house near a landmark such as Church of St Martin, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. If you let a flat or house near Westenhanger station, cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
Postling Green is about 5 miles west of Hythe, in Kent. If you need window mastic in Postling Green, it’s easy to get a quote: please call 0345 464 0079 or drop us an email. We are based in Crawley and cover Kent. Our area takes in 922 places across Kent. Our Crawley page covers work nearby.
Postcode districts we cover here for window mastic: TN25. Neighbouring places we cover for window mastic include Aldington (1 mile north-west), Stonestreet Green (1 mile north-west), Bonnington (1 mile west), Clap Hill (1 mile north-west) and Aldington Frith (2 miles north-west). Further out, we also cover Ashford (6 miles north-west), Canterbury (15 miles north), Dover (15 miles east), Folkestone (9 miles east), Hythe (5 miles east) and Tower Hamlets (15 miles east).
Around Postling Green
Locally, jobs take us to homes and businesses close to Walnut Tree Inn and Poulton Wood and the streets around them. The nearest railway station is Westenhanger station, roughly 3.5 miles east of the centre. Nearby you’ll also find William Harvey Hospital (4.6 miles north-west) and Lympne Castle (2.8 miles east). Not far away are Hatch Park.
Different surfaces, different methods
Composite doors
Composite doors are normally hung in an uPVC-type frame, and the joint around it is sealed like a window. We match the colour to the frame.
Patio & French doors
Not every patio door leak is a mastic problem: worn seals, blocked drainage slots or a poor threshold detail can be the cause. We check before we reseal.
What affects the quote in Postling Green
The price is agreed before any work begins. It takes into account:
- How many rooms, windows or areas are involved
- How much there is to do
- Any mould that needs treating
- Whether old sealant or filler has to be cut out
Combining jobs into one visit generally makes better use of the time than several visits. We’ll send you a clear quote for the lot.
Asking for a quote
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- How we’d reach the joints
- Whether it’s a home or a business
- Where the property is
- Photos by email, if that’s easy
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we’ll explain how we’d tackle it. When it suits you, ring 0345 464 0079 or send us an email.