Hampshire · England
Southrope Window Mastic
Window mastic in Southrope from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Damp patches on the reveal after heavy rain
- Gaps left after new windows were fitted
- Draughts coming in around windows and doors
How the job changes by surface
Composite doors
Front doors take the weather head on. We pay most attention there.
Aluminium frames
Aluminium needs a sealant that bonds to coated metal, and acetoxy silicones are not used, as they can attack some metals. Neutral-cure sealant is the safe choice.
Window mastic for homes and businesses in Southrope
There are two joints on most windows. Outside, the mastic keeps rain out; inside, the joint between frame and plaster stops draughts and tidies the reveal. We seal one or both, depending on what’s needed. Common call-outs are for old mastic that has gone black or come away and rushed sealant from a window installation, across aluminium frames, composite doors and patio & French doors.
Mastic can only go onto a dry, clean joint, so window work in Southrope is booked around the forecast. Let us know about access to all the frames, upstairs ones included.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we’ll sort it.
- Where
- Southrope (RG25)
- Region
- Hampshire
- Guarantee
- A year, on every job
- Quote
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Southrope: your questions answered
Can you help a landlord with a rental near Alton station?
Yes, we work for letting agents and landlords. Just phone 0345 464 0079 or email us and tell us about the property, and we’ll send you a clear quote.
Is Southrope within the area you cover?
Yes, smaller places are covered as well as towns. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Will new mastic stop draughts?
If the draught is coming in around the frame, yes. If it’s coming through the window seals, we’ll tell you.
Can you do upstairs windows?
Usually, yes. Access is planned before we start, so mention the height and anything in the way.
Can I add another job to the visit?
Yes. Just list everything you need.
Can you get sealant to suit coloured frames?
Yes, in most cases. Mention the frame colour when you ask for a quote and we will use the nearest match.
Are you fully insured?
Yes, we’re fully insured for domestic and commercial work.
Is the new sealant paintable?
Not usually, if it’s silicone. Tell us your decorating plans and we will pick a sealant to suit.
Frames and glazing around Southrope
Historic houses like Hall Place (about 3.1 miles south) are a reminder that the area around Southrope 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. The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
In the older streets around Church of St. Mary, frames set in older brick or stone need a sealant that suits the wall as well as the frame. If you let a flat or house near Alton station, renewing tired window mastic between tenants heads off draught and damp complaints.
Southrope is about 4 miles north-west of Alton, in Hampshire. We carry out window mastic for householders, landlords and businesses in Southrope and nearby. Across Hampshire, we cover 683 places, and Southrope is one of them. Reading is on our list too, about 17 miles from Southrope.
Postcode districts we cover here for window mastic: RG25. That includes homes and businesses on King Johns Lane, Back Lane and Hockleys Lane and the roads around them. If you’re just outside Southrope, we cover Bagmore (1 mile west), Burkham (2 miles south-west), Shalden Green (2 miles south-east), Shalden (2 miles south-east) and Bentworth (3 miles south). We also work in nearby towns such as Basingstoke (5 miles north-west), Winchester (15 miles south-west), Farnborough (14 miles north-east), Fleet (10 miles north-east), Aldershot (13 miles east) and Alton (4 miles south-east).
Near you in Southrope
The closest station to Southrope is Alton station, roughly 4.5 miles south-east of the centre. A little further out are Gliding Heritage Centre (1.2 miles south-east) and Basing House (4.9 miles north). Not far away are Holybourne Hill.
Also in Southrope
When something else is needed
Some problems need a builder, plumber or other trade rather than us:
- Soft or decayed wood in the frame
- Faulty window hardware
- Misting between the panes of a double-glazed unit (that needs a new unit)
If in doubt, call 0345 464 0079 or send us an email and we will say what we think.
Joints and surfaces we work on
- Timber windows & doors
- Composite doors
- Patio & French doors
- Window sills
- Aluminium frames
- uPVC windows
Can I do it myself?
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
A careful DIYer can reseal a simple joint, 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.
For landlords and businesses
We work for landlords and letting agents as well as homeowners. Resealing between tenancies is a simple way to keep a property in good order.
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance.
How to look after the new joints
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Paint up to the joint, not over it
- Keep timber frames painted
- Wipe condensation off the frames
- Clear any debris from frame drain holes
Timber frames need their paint kept up, because bare, wet timber moves more and pulls at the joint. Keep paint off the silicone itself.
Wet, windy weather is when failed mastic shows itself, but sealant goes on best when frames and walls are dry. Dealing with it when you first notice a crack avoids chasing leaks through the wet months.
How we quote for window mastic
We don’t publish a price list, because no two jobs are the same. What we look at:
- How many areas need sealing
- The type of sealant required
- Working hours on commercial sites
- Any mould that needs treating
Every job is a little different, so each one gets its own quote. Size, access and the product the joint needs all play a part, and we will explain the quote if you ask.
Helping us quote
Photos help, but a description is a good start. Try to tell us:
- The address or postcode of the job
- Any access issues, like height or stairs
- What’s wrong with the joints now
- A few photos by email, if you can
For a quick quote, get us on the phone, or send an email if you’d rather. Tell us about the joints that need doing and we will explain what’s involved and send you a clear quote.
What happens on the day
There is not much for you to do on the day. Show us the job and we’ll take it from there. The work itself takes a few hours for a few frames, or a day or more for a whole house, including the tidy-up. In a small place like Southrope, access is normally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We check how each frame can be reached safely.
- All the failed sealant is cut away.
- Frame and wall are cleaned and must be dry before sealing.
- Backing rod fills deep voids and the sealant goes in on top.
- The joint is shaped to shed water and the area tidied.
Getting ready for the visit
- Mention any tricky access
- On commercial sites, let us know about site rules
- For indoor joints, keep the area dry beforehand if you can
Get a quote
For window mastic in Southrope, phone 0345 464 0079 or send 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.