East Sussex · England
Window Mastic in Upper Hartfield
Problem with your window and door frames in Upper Hartfield? We cut out the old, prepare the joints and apply the right sealant.
- Hard, cracked sealant around windows
- A bead that does not match the frame
- Cold air getting in at the frame edge
Window mastic for homes and businesses in Upper Hartfield
Every window and door frame has a gap around it, and mastic is what closes it. When it cracks, hardens or pulls away, draughts and rain get in. Our applicators cut it out and replace it with a flexible, weatherproof sealant. We work on timber windows & doors, uPVC windows and aluminium frames, and the jobs we see most are gaps between the frame and the inside reveal and hard, cracked sealant around windows.
Somewhere as small as Upper Hartfield, older homes often have timber frames set in stone or brickwork. Older buildings like these don’t always suit modern silicone, and sometimes a traditional sand mastic is the better choice.
You get a 12-month guarantee, the same in Upper Hartfield as everywhere else we work.
- Place
- Upper Hartfield (TN7)
- Wider area
- East Sussex
- Cover
- A year, on every job
- Quotes
- A clear price before work begins
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
What we do, step by step
Every visit runs the same way: we look at the joints together, protect the area around them, do the work and tidy away. Most jobs take a few hours for a handful of frames, longer for a whole house. In a small place like Upper Hartfield, access is normally the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- First, we go round the frames with you and agree the list.
- The old mastic is cut out and scraped back to clean surfaces.
- Deep gaps get closed-cell backing rod to set the depth.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- Every joint is tooled smooth and checked before we leave.
Getting ready for the visit
- Clear items away from the joints we are working on
- Tell us about any water getting in
- Keep children and pets away from the work area
Get a quote
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and email photos if that is easy.
Advice
Common problems we fix in Upper Hartfield
Older frames were often sealed with products that set hard. Once it’s rigid, every bit of frame movement pulls at it, and a gap opens along one edge.
Common reasons people contact us are:
- Whistling draughts around closed windows
- Gaps between the frame and the inside reveal
- Cracked sealant at the sill ends
- Damp patches on the reveal after heavy rain
If you live in an older home near Holy Trinity Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Before you book anyone
- Who does the work, and how experienced they are
- How the colour is chosen
- What product goes in the joint
- What guarantee comes with the work
Windows and doors in Upper Hartfield
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 Bassetts Manor (about 1.9 miles north) are a reminder that the area around Upper Hartfield 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.
Letting a property close to Ashurst Kent station? Then sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Upper Hartfield is about 5 miles north-west of Crowborough, in East Sussex. Wherever you are in the TN7 postcode area, we can carry out window mastic at your property. Upper Hartfield is one of 289 places in East Sussex where we work for window mastic. There’s also a page for Crawley, about 12 miles away.
Here we cover the TN7 postcode area for window mastic. Whether your property is on Parrock Lane, Cat Street and Gallipot Hill or a nearby road, we can help. Other places close to Upper Hartfield include Coleman's Hatch (1 mile south-west), Forest Row (2 miles west), Wych Cross (3 miles south-west), Duddleswell (4 miles south) and Chelwood Gate (4 miles south-west). Larger places within reach include Lewes (15 miles south), Crowborough (5 miles south-east), Uckfield (9 miles south), South Malling (15 miles south), Heathfield (11 miles south-east) and Cliffe (15 miles south).
Local landmarks in Upper Hartfield
The nearest railway station is Ashurst Kent station, roughly 3.7 miles north-east of the centre. Other landmarks nearby include Bolebroke Castle (2 miles north-east) and Crowborough War Memorial Hospital (4.2 miles south-east).
What we cannot put right
Before you book, it’s worth knowing the limits:
- A failed sealed unit that has misted up
- Draughts through the window seals rather than the frame
- Broken hinges, locks or handles
Not sure which it is? You can call 0345 464 0079 or email us and we will tell you honestly before you book.
Surfaces we seal
- Timber windows & doors
- Patio & French doors
- Window sills
- Aluminium frames
- Composite doors
- uPVC windows
How the job changes by surface
Composite doors
If the door itself is draughty, the issue may be the door seals or hinges rather than the frame mastic. We will tell you if that is what we find.
Window sills
Sills catch the water running down the glass, so the joints at each end and underneath matter. Each is cleaned out and resealed.
Upper Hartfield: your questions answered
Do you work for landlords with property near Ashurst Kent station?
Yes, we work for landlords and letting agents. You can ring 0345 464 0079 or send us an email with the address and a few details, and we’ll give you a fixed price before any work starts.
Will you come out to Upper Hartfield?
Yes. Upper Hartfield is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Can I add another job to the visit?
Yes, and it often makes sense. Doing several areas at once is generally more efficient.
How long will my window job take?
A handful of frames is a short visit. You will get a timescale with the quote.
Can you get sealant to suit coloured frames?
Yes, in most cases. Mention the frame colour when you ask for a quote and we’ll match it as closely as we can.
Can I do it myself?
Sometimes. The key is preparation: remove all the old material and work on a clean, dry joint. We can always put it right if it fails.
Can you reach windows above the ground floor?
Yes, as long as they can be reached safely. Let us know about access when you ask for a quote and we’ll plan for it.
Does someone need to be in?
Access is agreed with you when the job is booked. Indoors, that usually means someone at home.
Work for landlords, hotels and businesses
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements.
In hotels, rooms out of use cost money, so the work can be planned room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.
What happens if it’s left?
Redecorating is a good moment to renew the mastic. Fresh joints finish the job neatly. Older cottages and farmhouses around Upper Hartfield can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
There are no prices on our website, because the cost depends so much on the job itself. For a quick quote, please phone 0345 464 0079 or send us an email and we’ll talk you through it.
Why Upper Hartfield customers choose us
- Colour agreed with you before we start
- Fully insured
- An ARBOMaster approved applicator
- More than 20 years in sealant work
Looking after it afterwards
Good habits help new joints last longer. Our tips:
- Keep paint off silicone joints
- Avoid blasting the frames with a pressure washer
- Wash the frames with mild soapy water
- Don’t use solvent cleaners on the joint
On timber frames, keep the paintwork in good order, since wood that gets wet swells and shrinks more. Keep paint off the silicone itself.
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. Any of these is worth a call.