Hampshire · England
Gundleton Window Mastic
Window mastic across Gundleton and nearby, with old sealant always removed completely.
- Damp patches on the reveal after heavy rain
- Hard, cracked sealant around windows
- Whistling draughts around closed windows
How we handle window mastic in Gundleton
The mastic around a window or door seals the gap between the frame and the wall. Once that seal fails, wind and rain find the gap. Our applicators cut it out and replace it with a flexible, weatherproof sealant. We’re often asked to deal with leaking joints at the ends of sills and water coming in at the bottom corners of a door, on window sills, aluminium frames and uPVC windows.
Mastic can only go onto a dry, clean joint, so window work in Gundleton is booked around the forecast. Tell us about access to every side of the house, including upper-floor windows.
You’re covered for a year from the day we finish. If anything is not right with it, call 0345 464 0079 or send us an email.
- Where
- Gundleton (SO24)
- Wider area
- Hampshire
- Guarantee
- One year on every job
- Quotes
- A clear price before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
What we cannot put right
We’d rather tell you now than do work that will not last, so here’s what sealant can’t put right:
- Damp coming through the wall itself rather than the frame joint
- Condensation trapped between the panes
- Worn gaskets, brush seals or a door that has dropped
Not sure which it is? You can phone 0345 464 0079 or send us an email and we’ll tell you honestly.
Surfaces we seal
- Patio & French doors
- Window sills
- uPVC windows
- Composite doors
- Timber windows & doors
- Aluminium frames
How the job changes by surface
Aluminium frames
Coated aluminium needs a compatible sealant and we avoid acetoxy silicones, which can react with some metals. Neutral-cure sealant is the safe choice.
Window sills
Every drop off the glass ends up on the sill, so the sill ends and the joint under the frame are vital. Each is cleaned out and resealed.
Keeping the joints in good condition
To keep the joints looking good and working properly:
- Make sure the drainage slots are not blocked
- Keep timber frames painted
- Clean frames with a soft cloth and soapy water
- Do not use solvent cleaners on the joint
Timber frames need their paint kept up, since wood that gets wet swells and shrinks more. Paint up to the joint, not over the silicone.
Wet, windy weather is when failed mastic shows itself, but resealing works best in dry conditions. Dealing with it when you first notice a crack avoids chasing leaks through the wet months.
Signs you need window mastic in Gundleton
Frames are never completely still. A plastic or aluminium frame lengthens in sunshine and shortens as it cools, while the brick or render around it hardly moves. If the sealant can’t stretch, it splits.
Most people get in touch after spotting something like this:
- Old mastic that has gone black or come away
- Water coming in at the bottom corners of a door
- A bead that does not match the frame
- Gaps left after new windows were fitted
Schools such as Perins School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages.
Before booking anyone
- Whether the sealant suits the joint
- Who does the work, and how experienced they are
- How hidden problems are handled
- How the surfaces are prepared before sealing
What happens if it’s left?
Failed mastic is not a reason to replace sound windows. If the frames and glass are in good order, resealing the joints is often all that’s needed. Problems with the glass or gaskets are for a window company, and we’ll say so. Around Gundleton, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
The cost depends on the amount of work, how much old material has to come out and how easy the joints are to reach. You will have a clear quote before any work starts, so you know where you stand.
Why choose Mr Mastic in Gundleton
- Old sealant always removed completely
- Every job guaranteed for a year
- A sealant colour to suit the surroundings
- White, clear, grey or another colour, product permitting
See how sealant jobs are priced and our reviews.
What happens on the day
Every visit runs the same way: we look at the joints together, mask and protect the surrounding surfaces, carry out the job and tidy away. It generally takes a few hours for a handful of frames, longer for a whole house. For a village or hamlet like Gundleton, the journey is planned in advance: 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.
- Next the failed sealant is cut away and the joint cleaned.
- Deep gaps are filled with backing rod to set the depth.
- We apply a weatherproof sealant to match the frame and tool it neatly.
- We clear up and check every joint is fully closed.
How to prepare
- Let us know about stairs, lifts or work at height
- Try not to wet indoor joints just before the visit
- Mention any leaks or damp you’ve noticed
Getting a quote
For window mastic in Gundleton, phone 0345 464 0079 or send us an email. A short description of the job and where it is helps us quote, and you will get a clear quote before we start.
Advice
Nearby places to Gundleton
What else we do in Gundleton
Common questions in Gundleton
Do you cover smaller places like Gundleton?
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.
Is window mastic in Gundleton guaranteed?
Every job comes with our 12-month guarantee, wherever it is. We are fully insured, and an ARBOMaster approved applicator.
Where do you work from?
Our base is Crawley. Our area covers South East England, London and Scotland.
Will it make a mess?
Very little: the area around the joints is protected first, and we tidy up before we go.
Should I try DIY first?
Some simple jobs can be done by a careful DIYer. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Do you work for hotels and businesses?
Yes. We have worked for hotels, offices and other businesses and we’re fully insured.
How long will my window job take?
That depends on the number of frames, how they’re reached and the state of the old mastic. You will know the timing when we quote.
Can you do upstairs windows?
Yes, in most cases. Access is planned before any work starts.
Landlords, agents and businesses in Gundleton
In hotels, rooms out of use cost money, so we plan the work room by room. Hotel work is part of what we do, alongside homes and businesses.
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Resealing at the right time is simple maintenance.
What window mastic looks like in Gundleton
Historic houses like Hinton Ampner House (about 4 miles south) are a reminder that the area around Gundleton 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. Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
For an older house near a landmark such as Church of All Saints, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Gundleton is about 7 miles south-west of Alton, in Hampshire. Jobs in Gundleton get the same care as everywhere else we work: old sealant removed completely, careful preparation and a one-year guarantee. 683 places in Hampshire are on our list, from the larger towns to small villages. For nearby work, see our Southampton page.
Postcode districts we cover here for window mastic: SO24. Window mastic is available to properties on Goscombs Lane and Bighton Lane and the roads around them. Other places close to Gundleton include Bishop's Sutton (1 mile south-west), New Alresford (2 miles west), Bramdean (3 miles south), Hinton Ampner (4 miles south) and Cheriton (4 miles south-west). Within a short drive, we also cover Basingstoke (12 miles north), Winchester (9 miles west), Eastleigh (13 miles south-west), Horndean (14 miles south), Chandler's Ford (14 miles south-west) and Alton (7 miles north-east).
Landmarks near Gundleton
We work in homes and buildings around Three Horseshoes Public House and the streets around them. Other landmarks nearby include Barton Castle (2.9 miles north). Open spaces near Gundleton include Shutts Copse and Red Hill.