Kent · England
Window Mastic in Horns Green
Mastic around window and door frames, sills and patio doors for homes and businesses in Horns Green and across Kent. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Damp patches on the reveal after heavy rain
- Gaps where the sill meets the wall
- Rushed sealant from a window installation
How we handle window mastic in Horns Green
From a single sill to a whole house of windows, you will get a clear quote before we start. To get one, phone 0345 464 0079 or drop us an email with the number of frames and any access details. If you have rushed sealant from a window installation and draughty joints inside around the window, we can put it right.
Somewhere as small as Horns Green, older homes often have timber frames set in stone or brickwork. Not every older frame suits a modern silicone bead, and sometimes a traditional sand mastic is the better choice.
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
- Horns Green (TN14)
- Region
- Kent
- Cover
- A year, on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Horns Green questions
Do you work for landlords with property near Knockholt station?
Yes. We work for landlords and letting agents as well as homeowners. Just call 0345 464 0079 or send us an email with the address and what needs doing, and we will give you a clear quote.
Do you cover smaller places like Horns Green?
Yes, we do. We work across London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Can you work on commercial sites?
Yes. Hotels, offices and other businesses use us.
Will there be a smell?
It depends on the product. Some products have a noticeable smell, others very little.
Can new window sealant be painted?
Most silicone can’t be painted. If you plan to paint, tell us first and we can use a paintable sealant where it suits the joint.
What do you need from me for a quote?
Where the job is, what the problem is and roughly how big it is. If you can, email a few pictures.
Is it worth trying it myself?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
Do you work on first-floor windows?
Yes, in most cases. We plan safe access before the job.
Places near Horns Green
Also in Horns Green
How it works
Every visit runs the same way: we check the joints, mask and protect the surrounding surfaces, do the work and tidy away. Most jobs take anything from an hour or two to a full day, depending on how many frames there are. For a village or hamlet like Horns Green, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- 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.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- We tool each bead neatly and check every joint is closed.
Before we arrive
- Try not to wet indoor joints just before the visit
- Mention any parking rules near the property
- Clear items away from the joints we’re working on
How to get a quote
Asking for a quote is easy: let us know the job and the location, and roughly how big it is. A few pictures by email make the job easier to understand, and we will take it from there.
Read more
What affects the cost of window mastic
Call for a quick quote. The main things that affect it are:
- The old material and how stubborn it is
- The product the joint needs
- How many rooms, windows or areas are involved
- Whether there’s mould to deal with
Rather than a set price list, we look at what your job involves: how many joints, what’s in them now and how we reach them. You will know the price before we begin.
Asking for a quote
Photos help, but a description is a good start. Please mention:
- The problem you’ve noticed
- Access, such as stairs, a lift or height
- Roughly how big the job is
- Whether it’s a home or a business
For a quick quote, get us on the phone, or email us if that’s easier. Describe what needs sealing and we will talk you through the work and give you a clear quote.
Why deal with it now?
Draughts and leaks do not always mean new windows. Where the frames are sound, new mastic normally deals with draughts and leaks at the edges. Problems with the glass or gaskets are for a window company, and we will say so. Around Horns Green, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
Doing several joints on one visit is normally more efficient than separate visits, so tell us about everything that needs sealing. We will send you a clear quote for the lot.
Why choose Mr Mastic in Horns Green
- 180+ five-star Google reviews
- Anti-fungal sanitary silicone in wet areas
- We never seal over old sealant
- An ARBOMaster approved applicator
How the job changes by surface
Window sills
Stone and concrete sills have their own joints, and the joint under the frame can let rain run behind. We seal those with a sealant suited to masonry.
uPVC windows
Fitters’ mastic on plastic frames is sometimes thin and rushed. It comes out, deep gaps get backing rod and the joint is resealed.
What window mastic looks like in Horns Green
Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Historic houses like Down House (about 2.1 miles north-west) are a reminder that the area around Horns Green has older buildings as well as new. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
Letting a property close to Knockholt station? Then sound mastic around windows and doors keeps out the draughts and damp that tenants notice first. Schools such as Charles Darwin School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages. For an older house near a landmark such as Church of St Peter and St Paul, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Horns Green is about 5 miles west of Sevenoaks, in Kent. Across the TN14 area, our applicators can take on window mastic. Horns Green is one of 922 towns and villages in Kent where we work for window mastic. There’s also a page for London, roughly 15 miles from Horns Green.
Our applicators cover all of the TN14 postcode area for window mastic. Local streets include Cudham Lane South and Thrift Lane, all of which we cover. Close by, we work in Burlings (1 mile north-east), Cudham (1 mile north-west), Berry's Green (1 mile north-west), Single Street (1 mile north-west) and Aperfield (2 miles west). Within a short drive, we also cover Dartford (11 miles north-east), Sevenoaks (5 miles east), Royal Tunbridge Wells (14 miles south-east), Gravesend (15 miles north-east), Tonbridge (11 miles south-east) and Northfleet (14 miles north-east).
Local landmarks in Horns Green
We work in homes and buildings around The Blacksmith's Arms and the streets around them. The closest station to Horns Green is Knockholt station, about 3.4 miles north-east of the centre. Other landmarks nearby include Orpington Hospital (3.8 miles north). The countryside around Horns Green includes Downe Bank and Betsom's Hill.
Keeping the joints in good condition
Looking after new joints is easy, and it makes a real difference:
- Use gentle cleaners on frames and sealant
- Look round the frames every year or so
- Avoid blasting the frames with a pressure washer
- Keep drainage slots and sill grooves clear
Keep the new mastic undisturbed while it cures, following the cure time we give you. Do not point a pressure washer at the joints.
Look out for the warning signs: split or missing mastic, gaps, damp patches inside or black mould on the reveal. Any of these is worth a call.
Work for landlords, hotels and businesses
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
Failed sealant is one of the commonest items on a check-out report, and it’s easy to sort out between tenants. We can quote for more than one property at once.
Should I try it myself first?
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.