West Sussex · England
Window & door mastic in Upperton, West Sussex
Window mastic in Upperton from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Cracked internal joints between frame and plaster
- Cracked or shrunken mastic around the frame
- Old mastic that has gone black or come away
Surface by surface
Aluminium frames
Large aluminium doors have long joints down each side and across the head, and the bottom joint sees the most water. Each is cleaned, backed where deep and resealed.
Window sills
Every drop off the glass ends up on the sill, so the joints at each end and underneath matter. They’re cut out and resealed with exterior sealant.
About our window mastic in Upperton
Most frames have an outside joint and an inside one. The external joint is the weather seal; the internal joint closes the gap to the plaster and stops draughts. We seal one or both, depending on what’s needed. Common call-outs are for cracked or shrunken mastic around the frame and untidy mastic left by window fitters, on composite doors, window sills and patio & French doors.
Somewhere as small as Upperton, older homes often have timber frames set in stone or brickwork. Not every older frame suits a modern silicone bead, so the sealant has to be chosen to suit the building.
Big or small, it’s backed by our one-year guarantee in Upperton and across West Sussex.
- Where
- Upperton (GU28)
- Wider area
- West Sussex
- Guarantee
- 12 months on all our work
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Upperton homes and the weather
Historic houses like Petworth House (about 1.2 miles south-east) are a reminder that the area around Upperton has older buildings as well as new. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic. London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
In and around Upperton, as anywhere, good window mastic starts with a clean, dry, properly prepared joint.
Upperton is about 12 miles north-east of Chichester, in West Sussex. Whether you are in the middle of Upperton or further out, we cover window mastic for every kind of property, from flats and houses to offices and hotels. 371 places in West Sussex are on our list, large and small. There’s also a page for Crawley, roughly 21 miles from Upperton.
Jobs for window mastic in GU28 is quoted and booked the same way as anywhere else. Other places close to Upperton include Tillington (1 mile south-east), Hampers Green (1 mile east), River (1 mile west), Petworth (1 mile south-east) and Rotherbridge (2 miles south). Within a short drive, we also cover Horsham (14 miles east), Bognor Regis (14 miles south), Chichester (12 miles south-west), Littlehampton (14 miles south), Rustington (14 miles south-east) and Storrington (10 miles south-east).
Around Upperton
Other landmarks nearby include Midhurst Community Hospital (4.3 miles west) and Coultershaw Heritage Site (2.2 miles south). Open spaces near Upperton include Graffham Common and Blackdown.
Questions from Upperton
Is Upperton in your area for window mastic?
Yes. We work across London and the South East, and Upperton is part of that. You can call 0345 464 0079 or email us and tell us what needs doing, and we’ll give you a clear quote.
Will you come out to Upperton?
Yes, Upperton is covered. We work across London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Do you work for landlords and businesses?
Yes, regularly. We can quote for several properties at once, and between tenancies is a good time for the work.
How do I get a quote for window mastic in Upperton?
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 any work starts.
Can new window sealant be painted?
That depends on the product. Some hybrid sealants can be painted; silicone cannot. Tell us if you’re decorating and we’ll choose accordingly.
Do you have sealant for grey or black windows?
Usually, yes. Tell us the frame colour when you get in touch and we will use the nearest match.
I rent my home. Can I book you?
We can work for tenants, landlords or agents. Get your landlord’s agreement first.
Will it make a mess?
Very little: the area around the joints is protected first, and we clear up the old sealant and our materials before we leave.
Looking after it afterwards
How long the joints last depends on use and care. We suggest:
- Clean frames with a soft cloth and soapy water
- Walk round the house once a year and look at the joints
- Keep solvents and bleach off the sealant
- Repaint timber before it’s bare
Try not to touch the new joint while it cures, following the cure time we give you. Keep jet washers away from the frames.
Look out for the warning signs: cracks in the mastic, gaps you can see light through, damp on the reveal or mould around the inside of the frame. If you notice one, it’s time to get the joint looked at.
Work for landlords, hotels and businesses
From a single let to a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
If you manage several properties in or around Upperton, jobs at different addresses can be quoted together. Just tell us the addresses and what each one needs.
DIY sealant or a professional job?
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and does not move well, and getting the depth right matters as much as the look.
What happens if it’s left?
Resealing frames is a short job: it takes a morning for a couple of windows and a door. Wait for damp to appear and there may be plaster and decorating to sort out too. In a small place like Upperton, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
Combining jobs into one visit generally makes better use of the time than several visits, so tell us about everything that needs sealing. You’ll get one clear quote for the whole job.
What you get with us
- Approved under the ARBOMaster scheme
- A sealant colour to suit the surroundings
- Rated 4.9 stars on Google
- Fully insured
Read our cost guide and our reviews.
The process
All our tools and materials come with us in the van, so you do not need to buy or prepare anything. Once we have agreed what’s being done, the area is protected and the work begins. It normally takes a few hours for a few frames, or a day or more for a whole house. Somewhere like Upperton needs a little journey planning: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- First we look at every frame and agree the list.
- We remove the old mastic and clean the frame and the wall.
- 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.
Preparing for the visit
- Plan for the work area to be out of bounds to pets and children
- Where the joints are inside, avoid wetting them before we arrive
- Tell us if parking is tricky
Get a quote
Need a quote? Please call 0345 464 0079 or email us and tell us about the job. You’ll know what we plan to do, and what it will cost, before any work begins.
Related advice
Do you need window mastic in Upperton?
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.
Keep an eye out for any of the following:
- Rushed sealant from a window installation
- Water coming in at the bottom corners of a door
- Cracked or shrunken mastic around the frame
- Black, perished sealant on frames
If you live in an older home near The Parish Church of All Hallows, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
What to look for in a quote
- Which sealant they’ll use, and why
- How the surfaces are prepared before sealing
- When the joint can take water or movement
- Is the old sealant removed completely?