Hampshire · England
Window Mastic in Alton
Mastic around window and door frames, sills and patio doors for Alton, backed by a one-year guarantee. Call for a quick quote.
- Mastic that is falling out in pieces
- Draughts coming in around windows and doors
- Rain getting in at the frame or under the sill
What happens if it’s left?
Getting a straight, even bead on an outside frame takes practice, especially on upper floors. A professional job is cut out properly, backed where needed and finished neatly, using a product chosen for the frame and wall. Around Alton, failed sealant lets water into hidden places, like the floor under a bath, the back of a panel or the inside of a wall. Whatever the joint, failed sealant only gets worse.
The cost reflects the work involved, not a rough estimate. That is why we ask about the job first and agree the price before starting.
What you get with us
- Homes, businesses and hotels
- We leave the area clean and tidy
- ARBOMaster approved applicator
- White, clear, grey or coloured to suit, where the product allows
See our cost guide and what customers say.
How we handle window mastic in Alton
Whether it’s one leaking patio door or every frame on the house, you’ll get a clear quote before work begins. Just phone 0345 464 0079 or drop us an email and tell us how many frames there are and how they’re reached. If you are dealing with water coming in at the bottom corners of a door and cracked or shrunken mastic around the frame, we can put it right, on window sills, composite doors and timber windows & doors alike.
In a town like Alton, the windows on the most exposed side of a house take the brunt of the rain, and that is generally where the sealant gives up first. It’s worth looking at every frame, not just the one that leaks.
A one-year guarantee comes as standard, so you are covered after we have gone.
- Where
- Alton (GU34)
- Region
- Hampshire
- Guarantee
- One year on every job
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
What affects the cost of window mastic
We quote each job individually. This is what makes a difference:
- When we can work, for business premises
- How easy the joints are to reach
- The old material and how stubborn it is
- The size of the job
Combining jobs into one visit generally makes better use of the time than several visits, so it’s worth mentioning everything you’d like done. You will get one clear quote for the whole job.
Asking for a quote
You do not need to know the technical terms. It helps if you can tell us:
- Roughly how big the job is
- Pictures of the joints, sent by email
- Any previous sealing or DIY work
- Where the job is, and your postcode
Asking for a quote is easy: let us know the job and the location, and roughly how big it is. A few pictures by email make the job easier to understand, and we will take it from there.
When to call us in Alton
Sun, frost and rain wear sealant out. Sunlight dries the surface out, and over the years it loses its give, cracks and comes away.
The problems people generally mention when they call are:
- Cracked sealant at the sill ends
- Cracked internal joints between frame and plaster
- Gaps left after new windows were fitted
- Black, perished sealant on frames
If you let a flat or house near Alton station, renewing tired window mastic between tenants heads off draught and damp complaints.
Questions to ask before you book
- What preparation is included
- What happens if they find a problem under the old sealant
- Whether VAT is included
- Which sealant they’ll use, and why
How the visit works
We work through the job in order: protection first, then preparation, sealing and a tidy-up. Typically it takes most of a day for a typical house, less for a few frames, and the area is left clean. In Alton, parking is rarely complicated, though it helps to know about driveways or restrictions, and mention if the work is upstairs, in a flat or high on the outside.
- Each frame is looked over and we agree which ones need resealing.
- We remove the old mastic and clean the frame edge and wall.
- Deep gaps get closed-cell backing rod to set the depth.
- A flexible exterior sealant is applied in a colour to suit the frame.
- We tool each bead neatly and check every joint is closed.
How to prepare
- Tell us about any previous sealing or DIY attempts
- Let us know about parking restrictions
- On commercial sites, let us know about site rules
Ask for a quote
If you are in Alton and need window mastic, phone 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and we will agree the price before any work begins.
Related advice
Towns and villages near Alton
Other services in Alton
Keeping the joints in good condition
Aftercare is simple:
- Use gentle cleaners on frames and sealant
- Look round the frames every year or so
- Avoid harsh chemicals near the mastic
- Keep drainage slots and sill grooves clear
Timber frames need their paint kept up, since wood that gets wet swells and shrinks more. Keep paint off the silicone itself.
A failed joint lets water into the wall a little at a time. You might not see it until plaster blows or a damp patch appears inside. Catching it early keeps the fix to a reseal.
Windows and doors in Alton
With historic houses such as Bentworth Hall (about 3.2 miles west) nearby, there’s older building stock in the area around Alton as well as newer homes. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window. 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.
If you live in an older home near Church of St Lawrence, the joint between an old wall and a newer frame is generally the first place rain gets in. Schools such as Saint Lawrence Church of England Primary School are buildings too, and the mastic around its windows and doors needs looking after like any other building’s.
Alton is about 10 miles south-east of Basingstoke, in Hampshire. Wherever you are in the GU34 postcode area, our applicators can take on window mastic. 683 places in Hampshire are on our list, large and small. We also work in Reading, around 21 miles away.
Every address in GU34 is within our area for window mastic. We cover properties on High Street, Station Road and Goswell Square and the roads around them. Being close to the A339 and B3004, Alton is simple for us to get to. Other places close to Alton include Chawton (1 mile south-west), Holybourne (2 miles north-east), Neatham (2 miles north-east), East Worldham (2 miles south-east) and Golden Pot (2 miles north). Further out, we also cover Basingstoke (10 miles north-west), Farnborough (13 miles north-east), Fleet (10 miles north-east), Aldershot (11 miles north-east), Petersfield (10 miles south) and Yateley (14 miles north-east).
Around Alton
In Alton, that means homes and buildings near Amery Hill School, Treloar School and The 'Baker's Arms' Public House, among other places. Alton has its own railway station: Alton station. A little further out are Allen Gallery (within half a mile east) and Alton Community Hospital (0.9 miles south-west). Open spaces near Alton include Holybourne Hill.
Alton: your questions answered
I let a flat near Alton station. Can you help?
Yes, we work for letting agents and landlords. Just call 0345 464 0079 or email us and tell us about the property, and we’ll give you a clear price.
Is there a guarantee on window mastic in Alton?
Every job comes with our 12-month guarantee, wherever it is. We are also fully insured and ARBOMaster approved.
Are you fully insured?
Yes. Full insurance covers our work, and we can confirm the details when we quote.
Will resealing my frames help with draughts?
Yes, if the air is getting in around the frame. If it’s through the window’s own seals or a hinge, that’s a different fix, and we’ll say so.
Do you do commercial work?
Yes, regularly. We can plan bigger jobs in stages.
Do I need to be at home?
That depends on where the joints are. For work indoors, someone needs to let us in, and for outside work we’ll agree access with you when we book.
How long will my window job take?
A handful of frames is a short visit, while a whole house takes longer. You’ll get a timescale with the quote.
Will it make a mess?
No. We protect the surfaces around the joints, and we tidy up before we go.
Can I do it myself?
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
How the job changes by surface
Window sills
Every drop off the glass ends up on the sill, so the joints at each end and underneath matter. Each is cleaned out and resealed.
Aluminium frames
Metal frames expand in the sun and are often slim, with little room for error. A neat, narrow bead in a colour to match suits the frame.