Hampshire · England
Window Mastic in Cottonworth
Specialist window mastic for Cottonworth: the right sealant, proper preparation and a neat finish. Call for a quick quote.
- Cracked or shrunken mastic around the frame
- Rain getting in at the frame or under the sill
- Sealant in the wrong colour for the frame
What sealant work can’t fix
To be straight with you, some problems need a different trade:
- Draughts through the window seals rather than the frame
- Penetrating damp from a failed cavity tray or render
- Soft or decayed wood in the frame
Not sure which it is? You can call 0345 464 0079 or send us an email and we’ll tell you honestly before you book.
What we seal
- Composite doors
- Patio & French doors
- Window sills
- Aluminium frames
- uPVC windows
- Timber windows & doors
Window mastic in Cottonworth
Mr Mastic’s applicators have more than 20 years’ experience with window and door sealants. We’re ARBOMaster approved and fully insured, and every job is covered by a 12-month guarantee. We work on window sills, uPVC windows and composite doors, and people most often call us about rain getting in at the frame or under the sill and hard, cracked sealant around windows.
In a village or hamlet like Cottonworth, older cottages and farmhouses often have timber windows set in stone or brick. Older buildings like these don’t always suit modern silicone, and sometimes a traditional sand mastic is the better choice.
All our work is covered by a 12-month guarantee, wherever you are in Hampshire.
- Where
- Cottonworth (SP11)
- Wider area
- Hampshire
- Guarantee
- 12 months on all our work
- Price
- A clear price before we start
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
DIY versus a professional finish
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
FAQs for Cottonworth
Can you do window mastic in Cottonworth?
Yes. Our work covers London and the South East, and Cottonworth is part of that. You can ring 0345 464 0079 or drop us an email and tell us what needs doing, and we’ll give you a clear price.
Can you help a landlord with a rental near Andover station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. You can phone 0345 464 0079 or drop us an email with the details for a clear quote.
Do you hold any approvals?
Yes. We hold ARBOMaster approved applicator status, and we are fully insured.
Does the work come with a guarantee?
Yes, for 12 months. A yearly look at the joints helps them last.
How long will my window job take?
Allow a morning for a couple of windows and a door. Access and the amount of old mastic make the biggest difference.
Can new window sealant be painted?
Silicone generally will not take paint. If you plan to paint, tell us first and we can use a paintable sealant where it suits the joint.
What should I tell you?
Just the basics: the address or postcode, what’s wrong and any access issues. After that, simply ring 0345 464 0079 or email us.
Is it messy?
Very little: the area around the joints is protected first, and we clear up the old sealant and our materials before we leave.
Aftercare tips
A little care helps the new joints last. Our advice:
- Use gentle cleaners on frames and sealant
- Keep jet washers away from the mastic
- Paint up to the joint, not over it
- Clear any debris from frame drain holes
Clean the frames with mild soapy water, and avoid solvent cleaners on the sealant.
A small gap around a frame only grows. As old mastic keeps shrinking, the gap widens, and heat escapes around the frame. A new joint closes it up.
Nearby places to Cottonworth
What else we do in Cottonworth
Cottonworth homes and the weather
Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Homes close to Church of St Mary the Less include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Cottonworth is about 4 miles south of Andover, in Hampshire. Every kind of property in Cottonworth is covered for window mastic. Every job comes with our 12-month guarantee. Across Hampshire, we cover 683 places, Cottonworth among them. For nearby work, see our Southampton page (17 miles or so).
Here we cover the SP11 postcode area for window mastic. If you’re just outside Cottonworth, we cover Fullerton (1 mile south-west), Chilbolton (1 mile east), Wherwell (1 mile north-east), Wherwell Wood (1 mile north) and Leckford (1 mile south). Within a short drive, we also cover Winchester (9 miles south-east), Eastleigh (14 miles south), Andover (4 miles north), Chandler's Ford (12 miles south), Romsey (11 miles south) and Hyde (9 miles south-east).
Around Cottonworth
Locally, jobs take us to homes and businesses close to Longstock Park and Abbots Mitre pub, among other places. The nearest railway station is Andover station, about 4.1 miles north. Well-known places in the area include Andover War Memorial Hospital (4.4 miles north) and Andover Museum (3.8 miles north). The countryside around Cottonworth includes Anton Lakes and Mill Lake.
Do you need window mastic in Cottonworth?
Frames are never completely still. Sun on a frame makes it expand, and it contracts again overnight, while the brick or render around it hardly moves. If the sealant can’t stretch, it splits.
Keep an eye out for these signs:
- Untidy mastic left by window fitters
- White mastic on grey or black frames
- Leaking joints at the ends of sills
- Cracked or shrunken mastic around the frame
Rented homes near Andover station change hands often, and cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
Before you book anyone
- What the cure time is
- How the surfaces are prepared before sealing
- Whether they’re fully insured
- What guarantee comes with the work
How the visit works
On the day, we start by going over the job with you, so you know exactly what we are doing. We protect the surfaces around the joints before any work begins. The work usually takes a few hours for a handful of frames, longer for a whole house. For a village or hamlet like Cottonworth, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- Each frame is looked over and we agree which ones need resealing.
- We remove the old mastic and clean the frame edge and wall.
- Where the gap is deep, backing rod goes in first.
- 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.
Before we arrive
- Mention any tricky access
- Mention any leaks or damp you’ve noticed
- For indoor joints, keep the area dry beforehand if you can
Get a quote
Call for a quick quote, or email us if that is easier. Tell us about the joints that need doing and we will talk you through the work.
Related advice
Surface by surface
Composite doors
A composite door usually sits in a plastic outer frame, so its perimeter joint is sealed much like a window. We match the colour to the frame.
Aluminium frames
Large aluminium doors have long joints down each side and across the head, and the threshold joint takes a lot of water. Each is cleaned, backed where deep and resealed.
Why act early in Cottonworth
Running fresh sealant over the old joint is tempting, but new sealant can’t bond to old, crumbling mastic. It peels before long, and water still gets in behind. Proper resealing starts with removing the old joint. In a small place like Cottonworth, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
There are no prices on our website, because each job is priced on what it involves. For a quick quote, please ring 0345 464 0079 or drop us an email and we’ll talk you through it.
What you get with us
- Sealant colour chosen to suit
- 180+ five-star Google reviews
- Sanitary silicone with an anti-fungal additive in wet areas
- Trusted Arbo and Everbuild sealants
Read what affects the cost and customer reviews.