Hampshire · England
Sand Mastic in Wherwell
Sand mastic in Wherwell from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Old sand mastic that has cracked, crumbled or fallen out
- Draughts and rain around sash boxes
- Patchy fillers round a sash window
How the job changes by surface
Brick reveals
Gaps between frame and brick let in rain and draughts. Renewing the mastic closes it.
Tenement and terrace windows
Rows of sash windows on tenements and terraces often need renewing together. We work on single windows or whole elevations.
Sand mastic for homes and businesses in Wherwell
We work across Wherwell renewing sand mastic on sash windows and doors. Each joint is raked out, prepared and pointed by hand, finished to suit the masonry. Common call-outs are for mastic round period door frames that has failed and a silicone bead on a sash window that spoils the look, across tenement windows, timber door frames and sash and case windows.
Homes in small places like Wherwell often stand in the open, with little to shelter their windows from wind and rain. Exposed frames and sills lose their mastic sooner than sheltered ones.
The work is guaranteed for twelve months. If something is not right with it in that time, tell us and we’ll put it right.
- Location
- Wherwell (SP11)
- Wider area
- Hampshire
- Guarantee
- A year, on every job
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
DIY sealant or a professional job?
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it peels away and traps moisture behind it. All the old material has to come out first.
Places near Wherwell
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What happens on the day
At the end, we look at the finished work together and explain the cure time. The work normally takes a few hours for a single window, longer for several, depending on the size of the job. In a small place like Wherwell, access is normally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We check each window surround and the condition of the joint.
- We rake out the old mastic and clean the joint.
- We fill deep gaps so the new mastic is not too thick.
- New sand mastic is applied and shaped by hand.
- We finish the mastic to a tidy line.
Getting ready for the visit
- Let us know about earlier repairs to the joints
- Tell us about access, such as stairs, a lift or high-level joints
- On commercial sites, let us know about site rules
How to get a quote
Call for a quick quote, or email us if that is easier. Describe what needs sealing and we will talk you through the work.
Advice
Common questions in Wherwell
Do you cover smaller places like Wherwell?
Yes, we do. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Can you help a landlord with a rental near Andover station?
Yes. We work for letting agents and landlords as well as householders. Just call 0345 464 0079 or send us an email with the address and what needs doing, and we will give you a clear price.
Do you do commercial work?
Yes. Commercial and hotel work is a large part of what we do. Working times can be discussed when we quote.
Can sand mastic be painted?
Traditional guidance is not to paint over sand mastic. If you are redecorating the window, ask us first and we’ll advise.
How long does sand mastic take to harden?
The surface skins quite quickly, then hardens over a longer period. Timing depends on the weather and the joint.
What exactly is sand mastic?
It’s sand mixed with a linseed-oil-based binder, used between timber frames and stone or brick.
Can I do it myself?
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.
Is consent needed for window work on a listed home?
It’s best to ask your local planning authority first. Sand mastic is often favoured as like for like, but they decide.
Landlord and commercial work in Wherwell
Landlords and letting agents in Wherwell can book us as well as homeowners. Sealant work between tenants is a simple way to keep a property in good order before the next move-in.
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
Wherwell homes and the weather
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.
Rented homes near Andover station change hands often, and any sash windows need sound mastic to keep draughts and rain out. Homes close to Church of St Peter and Holy Cross include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as 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.
Wherwell is about 3 miles south-east of Andover, in Hampshire. We carry out sand mastic for homes and businesses in Wherwell and the surrounding area. Wherwell is one of 683 towns and villages in Hampshire where we work for sand mastic. There’s also a page for Southampton, about 17 miles away.
Here we cover the SP11 postcode area for sand mastic. That includes homes and businesses on High Street, Fair Piece and Beech Grove. Other places close to Wherwell include 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).
Local landmarks in Wherwell
In Wherwell, that means homes and buildings near White Lion Public House and Longstock Park and the streets around them. Wherwell’s nearest station is Andover station, roughly 3.7 miles north-west of the centre. Well-known places in the area 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.
Why deal with it now?
Not every draught comes from the sashes themselves. Open mastic joints round the box can let air in, and renewing the mastic closes them. Around Wherwell, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
A few things move the cost up or down: the old material and how easily it comes out, whether mould needs treating, and whether we need extra access for height. Your quote takes all of that into account.
Why book with us
- Every job guaranteed for a year
- We leave the area clean and tidy
- Experience in homes, commercial sites and hotels
- An ARBOMaster approved applicator
When something else is needed
Sealant isn’t the answer to every problem, and we will tell you before any work starts. It will not solve:
- Sash cords, weights and draught-proofing of the sashes
- Damaged stone surrounds
- Rotten sashes, sills or window boxes (a joiner’s job)
Not sure which it is? You can phone 0345 464 0079 or email us and we will tell you honestly before you book.
Joints and surfaces we work on
- Brick reveals
- Period & listed homes
- Stone surrounds
- Tenement windows
- Timber door frames
- Sash and case windows
How we quote for sand mastic
The price is agreed before any work begins. It takes into account:
- Mould in or behind the old joints
- Whether old sealant or filler has to be cut out
- The product the joint needs
- When we can work, for business premises
Homes and businesses are quoted the same way: the amount of work, how we reach it and what it needs, along with when we can work on site. Ask us for a quote and we’ll go through it with you.
Helping us quote
There’s no need for technical detail. It helps if you can tell us:
- Roughly how big the job is
- Pictures of the joints, sent by email
- The type of property
- Where the job is, and your postcode
For a quote, call 0345 464 0079 or email us with the location and a short description of the problem. You will have a clear quote before we start.