Hampshire · England
Wherwell Window Mastic
Mastic around window and door frames, sills and patio doors for homes and businesses in Wherwell and across Hampshire. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Rushed sealant from a window installation
- Mastic that has split away from the wall
- Black, perished sealant on frames
Windows and doors in Wherwell
The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
For landlords with property near Andover station, renewing tired window mastic between tenants heads off draught and damp complaints. For an older house near a landmark such as Church of St Peter and Holy Cross, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Wherwell is about 3 miles south-east of Andover, in Hampshire. Wherever you are in the SP11 postcode area, we can carry out window mastic at your property. Our Hampshire coverage runs to 683 places, and Wherwell is one of them. There’s also a page for Southampton, roughly 17 miles from Wherwell.
Every address in SP11 is within our area for window mastic, from the main roads to the quietest streets. Whether your property is on High Street, Fair Piece and Beech Grove or a nearby road, our applicators can take on the job. Close by, we work in Wherwell Wood (1 mile north-west), Cottonworth (1 mile south-west), Chilbolton (1 mile south), Fullerton (1 mile south-west) and South Harewood (1 mile north-east). Within a short drive, we also cover Winchester (9 miles south-east), Eastleigh (14 miles south), Andover (3 miles north-west), Chandler's Ford (13 miles south), Romsey (12 miles south) and Hyde (9 miles south-east).
Around Wherwell
Around Wherwell, our work takes us to homes and buildings near White Lion Public House and Longstock Park, among other places. Wherwell’s nearest station is Andover station, about 3.7 miles north-west of the centre. Other landmarks nearby include Andover Museum (3.3 miles north-west) and Andover War Memorial Hospital (4 miles north-west). Open spaces near Wherwell include Mill Lake and Anton Lakes.
How we handle window mastic in Wherwell
Around Wherwell we seal all kinds of frames: from uPVC casements to timber and aluminium, plus patio doors, French doors and sills. The sealant is chosen to suit the frame material and the wall. Common call-outs are for gaps between the frame and the inside reveal and old mastic that has gone black or come away, across timber windows & doors, composite doors and aluminium frames.
Mastic can only go onto a dry, clean joint, so window work in Wherwell is booked around the forecast. Let us know about access to all the frames, upstairs ones included.
All of our work is guaranteed for twelve months, and the guarantee is the same wherever you are.
- Where
- Wherwell (SP11)
- Region
- Hampshire
- Guarantee
- One year on every job
- Price
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Towns and villages near Wherwell
More services for Wherwell
Wherwell questions
Is Wherwell within the area you cover?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Can you do window mastic in Wherwell?
Yes, Wherwell is within the area we cover. Our work covers London and the South East. You can ring 0345 464 0079 or drop us an email and tell us what needs doing, and we will give you a clear quote.
Do I have to be there?
That depends on where the joints are. Inside work needs someone to give us access, and for outside work we’ll agree access with you when we book.
Is the new sealant paintable?
Silicone generally won’t take paint. Let us know beforehand, and we’ll use a paintable product where it suits.
Can new sealant go over the old?
No, it will not last. It may look fine at first, but the new layer lifts away from the old one. The old sealant has to come out completely.
Are you insured?
Yes. We’re fully insured, and we’ve been doing sealant work for more than 20 years.
Is it messy?
Tidy work is part of the job. Nearby surfaces are protected.
Can you do upstairs windows?
Yes, if safe access is possible. For high or awkward windows, we will tell you what access is needed.
Surface by surface
Patio & French doors
Patio and French doors have the longest joints on most houses. The threshold and the bottom corners take the most water, so we pay close attention there.
Window sills
The end joints of a sill tend to fail before the rest. A tight seal at each end keeps rain out of the wall.
What we cannot put right
Some problems need a builder, plumber or other trade rather than us:
- Faulty window hardware
- Worn gaskets, brush seals or a door that has dropped
- A failed sealed unit that has misted up
If you’re not sure, just ring 0345 464 0079 or send us an email and we will give you a straight answer.
Where we work in Wherwell
- Timber windows & doors
- uPVC windows
- Aluminium frames
- Composite doors
- Patio & French doors
- Window sills
Looking after it afterwards
No joint lasts for ever, but care makes a real difference. A few tips:
- Ventilate rooms so frames do not stay wet inside
- Keep timber frames painted
- Do not paint over the silicone
- Keep drainage slots and sill grooves clear
Keep sill grooves and drainage slots clear, so water can run away instead of sitting against the joint.
Signs to watch for: split or missing mastic, gaps, damp patches inside or black mould on the reveal. If you notice one, it’s time to get the joint looked at.
When to call us in Wherwell
Older frames were often sealed with products that set hard. Once it’s rigid, every bit of frame movement pulls at it, leaving a hairline gap down one side.
Common reasons people contact us are:
- Whistling draughts around closed windows
- Gaps left after new windows were fitted
- A bead that doesn’t match the frame
- Cracked or shrunken mastic around the frame
If you look after a building such as Wherwell Primary School, larger buildings have plenty of frames, and the mastic around each one ages.
What to look for in a quote
- Who does the work, and how experienced they are
- Is the old sealant removed completely?
- How the colour is chosen
- How the surfaces are prepared before sealing
What affects the quote in Wherwell
We quote each job individually. This is what makes a difference:
- Which sealant suits the joint
- When we can work, for business premises
- Any mould that needs treating
- The number and length of the joints
The cost reflects the work involved, not a rough estimate. That is why we ask about the job first.
What to tell us for a quote
To help us quote quickly, please include:
- Whether it has been sealed before
- What’s wrong with the joints now
- A few photos by email, if you can
- How we’d reach the joints
For a quick quote, get us on the phone, or email us if that’s easier. Describe what needs sealing and we’ll explain what’s involved.
What we do, step by step
When we arrive, we start by going over the job with you, so you know exactly what we are doing. Surfaces next to the work are protected before any work starts. The work generally takes a few hours for a handful of frames, longer for a whole house. In a small place like Wherwell, access is generally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- First we look at every frame and agree the list.
- Next the failed sealant is cut away and the joint cleaned.
- Where gaps are deep, backing rod goes in first.
- We apply a weatherproof sealant to match the frame and tool it neatly.
- Finally we tidy up and check each joint.
How to prepare
- Try not to wet indoor joints just before the visit
- Let us know about parking restrictions
- Let us know if you’ve seen damp or leaks
Get a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we’ll explain how we’d tackle it. When it suits you, phone 0345 464 0079 or drop us an email.
Related advice
Landlord and commercial work in Wherwell
Hotels need rooms back in use, so we plan the work room by room around your bookings where we can. We have worked in hotels as well as homes and businesses.
Landlords and agents in Wherwell can book us as well as householders. Sealant work between tenants is a simple way to keep a property in good order.