Kent · England
Window Mastic in Headcorn
Window mastic for Headcorn and the surrounding area: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Gaps between the frame and the inside reveal
- Leaking joints at the ends of sills
- Damp patches on the reveal after heavy rain
Can I do it myself?
If you are set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it doesn’t work out, we can still put it right.
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
Window mastic in Headcorn, done properly
Frames and walls don’t move together. Heat and cold make frames grow and shrink against brick or render that hardly moves. So the sealant has to stretch and recover, which is why we use a low-modulus product. We work on window sills, patio & French doors and aluminium frames, and common reasons people get in touch are leaking joints at the ends of sills and mastic that has split away from the wall.
Around Headcorn, conservatories, garden rooms and patio doors are often part of the house. Those joints need the same attention as the main windows, and any older timber or sash windows need a sealant that suits them.
All of our work is guaranteed for twelve months, and the guarantee is the same wherever you are.
- Place
- Headcorn (TN27)
- Wider area
- Kent
- Guarantee
- One year on every job
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Different surfaces, different methods
uPVC windows
We clean the frame edge carefully so the plastic is not marked, then the sealant goes in between frame and wall and tooled smooth.
Timber windows & doors
On period timber windows, traditional sand mastic is sometimes the better choice. We can talk through the options.
FAQs for Headcorn
Do you cover smaller places like Headcorn?
Yes, Headcorn is covered. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Can you help a landlord with a rental near Headcorn station?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. You can ring 0345 464 0079 or send us an email with the details for a clear quote.
Is it messy?
Very little: the area around the joints is protected first, and we clear up the old sealant and our materials before we leave.
How many windows can you do in a day?
The work takes a few hours for a few frames, or a day or more for a whole house. Access and how stubborn the old mastic is affect the time most.
Do you guarantee window mastic?
Yes. Our one-year guarantee covers every job.
Do you do commercial work?
Yes, regularly. We can plan bigger jobs in stages to suit the site.
Can new sealant go over the old?
No, it will not last. It may look fine at first, but the new bead soon lifts. The old sealant has to come out completely.
Can I do it myself?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. Most DIY failures come from sealing over old material, wet joints or too much sealant.
What window mastic looks like in Headcorn
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.
Schools such as Headcorn Primary School are buildings too, and the mastic around its windows and doors needs looking after like any other building’s. In the older streets around St Peter's and St Paul's Church, the joint between an old wall and a newer frame is generally the first place rain gets in.
Headcorn is about 8 miles south-east of Maidstone, in Kent. Our applicators cover window mastic for homes and businesses in Headcorn and nearby, as part of our work across Kent. Headcorn is one of 922 places in Kent we cover. We also work in Crawley, around 36 miles away.
Work in TN27 works the same way as everywhere else we cover. Whether your property is on Station Road, High Street and Knight's Way or anywhere close by, our applicators can take on the job. We also cover the places around Headcorn: Hearnden Green (1 mile north-west), Southernden (2 miles north-east), Swift's Green (2 miles east), Lashenden (2 miles south) and Smarden Bell (2 miles south-east). Further out, we also cover Maidstone (8 miles north-west), Ashford (11 miles east), Sittingbourne (13 miles north), Tonbridge (15 miles west), Faversham (15 miles north-east) and Kings Hill (12 miles north-west).
What’s near Headcorn
In Headcorn, that means homes and buildings near The Kings Arms Inn And Shop Adjoining To Right and the streets around them. Headcorn has its own railway station: Headcorn station. Well-known places in the area include Sutton Valence Castle (3.2 miles north-west) and Benenden Hospital (5.8 miles south).
What happens on the day
On the day, we start by going over the job with you, so you know exactly what we’re doing. Surfaces next to the work are protected before any work begins. Most jobs take anything from an hour or two to a full day, depending on how many frames there are. For a job in Headcorn, we agree the time, the access and parking before the day. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- We start by checking each window and door with you.
- Next the failed sealant is cut away and the joint cleaned.
- We fit backing rod in deep gaps so the sealant is the right depth.
- A flexible, weatherproof sealant is applied in a colour to suit the frame.
- We clear up and check every joint is fully closed.
Before we arrive
- Let us know about stairs, lifts or work at height
- Mention any parking rules near the property
- Move anything stored near the joints
Ask for a quote
For window mastic in Headcorn, phone 0345 464 0079 or email us. A short description of the job and where it is helps us quote, and we will agree the price before any work begins.
Read more
What happens if it’s left?
A cracked joint around a frame lets rain into the wall. Left long enough, it can stain inside walls, spoil plaster and rot wooden frames. Resealing now is a small job by comparison. Homes in smaller places like Headcorn can face more weather, and failed outside joints let damp into walls. Indoors, a failed seal lets water into floors and panels as it would anywhere.
The cost depends on how much there is to do, how hard the old material is to remove and access to the work. We give a clear quote before any work starts, so you know where you stand.
What you get with us
- Colour agreed with you before work begins
- Colour picked to suit the job
- Homes, businesses and hotels
- A 12-month guarantee on all work
Read our cost guide or customer reviews.
What affects the quote in Headcorn
We quote each job individually. This is what makes a difference:
- The amount of work
- Whether the work is at height
- Working hours on commercial sites
- Any mould that needs treating
Homes and businesses are quoted the same way: the amount of work, the access and the products needed, plus any working-time requirements on site. Ask us for a quote and we will go through it with you.
What to tell us for a quote
When you call or email, these details help:
- Roughly how big the job is
- How we’d reach the joints
- The problem you’ve noticed
- A few photos by email, if you can
Every job is quoted individually, so the first step is telling us about yours. Just ring 0345 464 0079 or email us with the details.
Landlord and commercial work in Headcorn
If you manage several properties in or around Headcorn, jobs at different addresses can go on one quote. Just tell us the addresses and what each one needs.
We also work for property managers and facilities teams. Several sites can be quoted together.
Do you need window mastic in Headcorn?
On timber frames, paint and putty build up around the joint. Old mastic gets painted over and cracks under the paint, and the wood moves with damp as well as heat.
Any of these means the joints need attention:
- Leaking joints at the ends of sills
- Mastic that’s falling out in pieces
- A bead that does not match the frame
- Damp patches on the reveal after heavy rain
Letting a property close to Headcorn station? Then cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
What your quote should include
- What happens if they find a problem under the old sealant
- Which colour the sealant will be
- Whether all the old sealant comes out first
- What preparation is included