East Sussex · England
Window & door mastic in Wilmington, East Sussex
We cover Wilmington for mastic around window and door frames, sills and patio doors. Old sealant removed completely, joints prepared properly and a one-year guarantee.
- Old mastic that has gone black or come away
- Gaps where the sill meets the wall
- Untidy mastic left by window fitters
Different surfaces, different methods
uPVC windows
Plastic frames move a lot between a hot afternoon and a cold night, so the joint needs a low-modulus sealant that stays flexible. We match white, brown, anthracite grey and black frames.
Patio & French doors
The joints around patio doors run a long way, top, sides and threshold. The threshold and the bottom corners take the most water, so they get particular care.
How we handle window mastic in Wilmington
Mr Mastic’s applicators have more than 20 years’ experience with window and door sealants. We’re ARBOMaster approved and fully insured, and we give a 12-month guarantee on the work. If you are dealing with gaps where the sill meets the wall and old mastic that has gone black or come away, we can put it right.
Outdoor sealant needs dry, clean surfaces, so work on frames around Wilmington is planned for dry weather. Let us know about access to all the frames, upstairs ones included.
Our work is backed for twelve months.
- Location
- Wilmington (BN26)
- Region
- East Sussex
- Guarantee
- A year, on every job
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
What we can’t put right
New sealant cannot fix everything, and we will tell you before any work starts. It won’t solve:
- Rotten timber, which needs a joiner first
- A failed sealed unit that has misted up
- Penetrating damp from a failed cavity tray or render
Not sure which it is? You can call 0345 464 0079 or send us an email and we will tell you honestly.
Surfaces we seal
- Composite doors
- Patio & French doors
- Timber windows & doors
- Aluminium frames
- uPVC windows
- Window sills
Towns and villages near Wilmington
What else we do in Wilmington
What happens if it’s left?
A quick bead over the top of old mastic looks like an easy fix, but new sealant cannot bond to old, crumbling mastic. It peels before long, and water still gets in behind. The old mastic has to come out. Where a wall is exposed, as many are in small places like Wilmington, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
Doing several joints on one visit normally makes better use of the time than several visits, so tell us about everything that needs sealing. We will send you a clear quote for the lot.
Why choose Mr Mastic in Wilmington
- A sealant colour to suit the surroundings
- Full insurance on every job
- Anti-fungal sanitary silicone in wet areas
- You choose the colour before work begins
Read what affects the cost or our reviews.
Common problems we fix in Wilmington
Sills take more water than any other part of a window, and the ends of the sill, where it meets the wall, are where it gets in. Failed sealant there lets rain into the wall or behind the frame.
These are the problems we’re asked about most:
- Leaking joints at the ends of sills
- Hard, cracked sealant around windows
- Gaps between the frame and the inside reveal
- White mastic on grey or black frames
If you let a flat or house near Berwick (Sussex) station, renewing tired window mastic between tenants heads off draught and damp complaints.
Questions to ask before booking
- Whether VAT is included
- Is the old sealant removed completely?
- How much experience the applicator has
- What guarantee comes with the work
DIY sealant or a professional job?
The biggest DIY mistake is sealing over old sealant. New silicone won’t bond to old, so it lifts and traps water and mould underneath. Everything old must be removed first.
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
What affects the cost of window mastic
We don’t publish a price list, because no two jobs are the same. What we look at:
- How much there is to do
- Any mould that needs treating
- The old material and how stubborn it is
- Which sealant suits the joint
Homes and businesses are quoted the same way: the amount of work, how we reach it and what it needs, along with when we can work on site. Call for a quick quote and we’ll go through it with you.
What we need to know
When you call or email, these details help:
- If someone has resealed it before
- Roughly how big the job is
- The problem you’ve noticed
- Where the property is
For window mastic in Wilmington, phone 0345 464 0079 or email us. Tell us what the problem is and where, and we will agree the price before any work begins.
Frames and glazing around Wilmington
The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Historic houses like Alfriston Clergy House (about 1.9 miles south-west) are a reminder that the area around Wilmington has older buildings as well as new. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window.
If you live in an older home near St Mary and St Peter's Church, the joint between an old wall and a newer frame is generally the first place rain gets in. Managing a site like Willingdon Community School? Then the mastic around its windows and doors needs looking after like any other building’s.
Wilmington is about 4 miles south-west of Hailsham, in East Sussex. Jobs in Wilmington get the same care as everywhere else we work: old sealant removed completely, careful preparation and a one-year guarantee. 289 places in East Sussex are on our list. For nearby work, see our Brighton page (14 miles or so).
Every address in BN26 is covered for window mastic, from the main roads to the quietest streets. Whether your property is on The Street and Ades Field or a nearby road, we can help. Other places close to Wilmington include Milton Street (1 mile south-west), Winton (2 miles west), Arlington (2 miles north), Berwick (2 miles north-west) and Lullington (2 miles south-west). Further out, we also cover Eastbourne (5 miles south-east), Bexhill-on-Sea (12 miles east), Seaford (5 miles south-west), Lewes (9 miles north-west), Hailsham (4 miles north-east) and Uckfield (11 miles north).
Around Wilmington
Locally, jobs take us to homes and businesses close to The Sussex Ox pub. The closest station to Wilmington is Berwick (Sussex) station, about 1.8 miles north-west of the centre. A little further out are Agricultural Museum (less than half a mile south) and Burlough Castle (1 mile west). For a walk, there’s Combe Hill.
What happens on the day
A visit follows a simple pattern: we check the joints, protect the area around them, carry out the job and tidy away. It generally takes a few hours for a handful of frames, longer for a whole house. In a small place like Wilmington, access is normally the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- We start by checking each window and door with you.
- The old mastic is cut out and the surfaces cleaned back.
- 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.
- Every joint is checked before we leave.
Before we arrive
- Where the joints are inside, avoid wetting them before we arrive
- Tell us about any water getting in
- Move anything stored near the joints
How to get a quote
For a quick quote, get us on the phone, or email us if that is easier. Tell us about the joints that need doing and we will talk you through the work.
Advice
FAQs for Wilmington
Will you come out to Wilmington?
Yes, smaller places are covered as well as towns. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Do you cover Wilmington for window mastic?
Yes, Wilmington is within the area we cover. Our work covers London and the South East. You can ring 0345 464 0079 or email us and tell us what needs doing.
Are you insured?
Yes. We’re fully insured, and we’ve been doing sealant work for more than 20 years.
Can you do upstairs windows?
Yes, in most cases. Access is planned before we start, so mention the height and anything in the way.
How long should I leave it?
It depends on the product and the temperature. Before we leave, we will tell you the cure time.
Will you leave a mess?
Not at all. The area is protected while we work and cleaned up afterwards.
Can landlords and businesses book you?
Yes, we do. Domestic, commercial and hotel work are all part of what we do.
How much does window mastic cost in Wilmington?
It depends on the job, so we quote each one individually. For a quick quote, ring 0345 464 0079 or email us and tell us what needs doing and where.