Hampshire · England
Sand mastic for sash & case windows in Cottonworth, Hampshire
Sand mastic for Cottonworth, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Old sand mastic that has cracked, crumbled or fallen out
- Weathered mastic on the most exposed windows
- Mastic that needs renewing before redecorating
Sand mastic for homes and businesses in Cottonworth
We work across Cottonworth renewing sand mastic on sash windows and doors. Each joint is raked out, prepared and pointed by hand for a neat, traditional finish. If you are dealing with modern sealant on a period surround and mastic worn away on windows facing the weather, we can put it right, on timber door frames, stone surrounds and tenement windows alike.
Outdoor sealant needs dry, clean surfaces, so work on frames around Cottonworth is planned for dry weather. Tell us about access to every side of the house, including upper-floor windows.
Whatever the size of the job, it’s backed by our 12-month guarantee in Cottonworth and across Hampshire.
- Place
- Cottonworth (SP11)
- Region
- Hampshire
- Guarantee
- A year, on every job
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
How the job changes by surface
Tenement and terrace windows
Windows above ground floor need the right access. Tell us the height and we will confirm what’s needed.
Period and listed homes
Many older homes were built with sand mastic round the windows. If your home is listed, ask your local planning authority about consent.
Keeping the joints in good condition
So the new joints stay in good condition:
- Don’t run silicone over sand mastic
- Check the mastic when you check the paintwork
- Ask the planning authority about consent for listed or conservation-area homes
- Have rotten timber repaired before new mastic goes in
When preparing windows for paint, take care around the mastic. It can be damaged by heavy scraping.
Sound mastic protects the frame. Once it fails, water can sit against the timber, which can lead to rot.
What happens on the day
On the day, we start by going over the job with you, so you know exactly what we’re doing. Surfaces next to the work are protected before any work begins. The work normally takes a few hours per window, depending on the condition of the joints. Somewhere as small as Cottonworth, access is often the only tricky part. 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.
- Large voids are packed out.
- New sand mastic is applied and shaped by hand.
- The finish is dressed neatly.
How to prepare
- On commercial sites, let us know about site rules
- Try not to wet indoor joints just before the visit
- Mention any tricky access
Ask for a quote
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and email photos if that is easy.
Related advice
Windows and doors in Cottonworth
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.
Letting a property close to Andover station? Then any sash windows need sound mastic to keep draughts and rain out.
Cottonworth is about 4 miles south of Andover, in Hampshire. Jobs in Cottonworth get the same care as everywhere else we work: old sealant removed completely, careful preparation and a one-year guarantee. 683 places in Hampshire are on our list, from the larger towns to small villages. Our Southampton page covers work nearby.
Here we cover the SP11 postcode area for sand mastic. If you are 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).
What’s near Cottonworth
In Cottonworth, that means homes and buildings near Longstock Park and Abbots Mitre pub and the streets around them. For rail, the closest station is Andover station, roughly 4.1 miles north of the centre. A little further out are Andover War Memorial Hospital (4.4 miles north) and Andover Museum (3.8 miles north). Green spaces nearby include Anton Lakes and Mill Lake.
Signs you need sand mastic in Cottonworth
Some old mastic was never deep enough. A thin layer doesn’t hold well, which is why we pack deep voids first and get the depth right.
Look out for any of the following:
- Cement or filler used on old window joints that has cracked
- Mastic round period door frames that has failed
- Failed mastic on an exposed elevation
- Modern sealant on a period surround
If you live in an older home near Church of St Mary the Less, the joint between an old wall and a newer frame is generally the first place rain gets in.
What your quote should include
- Is VAT in the price?
- Who does the work, and how experienced they are
- Whether they’re fully insured
- How hidden problems are handled
Also near Cottonworth
Other services in Cottonworth
Why deal with it now?
A silicone bead can be quicker, but it can look wrong on a period surround. Sand mastic is the traditional material and finishes neatly against the masonry. In a small place like Cottonworth, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
Instead of a standard rate, we look at what your job involves: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
What you get with us
- Neat joints and a tidy finish
- A 12-month guarantee on all work
- An ARBOMaster approved applicator
- Full insurance on every job
Landlord and commercial work in Cottonworth
We work for landlords and agents as well as homeowners. Resealing between tenancies is a simple way to keep a property in good order.
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
Questions from Cottonworth
Is Cottonworth within the area you cover?
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.
I let a flat near Andover station. Can you help?
Yes, we work for landlords and agents. Just call 0345 464 0079 or email us and tell us about the property, and we’ll give you a clear quote.
Is there any odour?
It depends on the product. Some products have a noticeable smell, others very little, and any smell fades as they cure.
When will the new mastic be hard?
The surface skins quite quickly, then hardens over a longer period. The weather and joint depth both affect it.
Do you do commercial work?
Yes. Commercial and hotel work is a large part of what we do. We can talk about working times when we quote.
Should I check with the council before work on a listed or conservation-area home?
Speak to your local planning authority before work starts. Sand mastic is often favoured as like for like, but they decide.
Is it possible to paint over sand mastic?
It’s traditionally left unpainted, as guidance on traditional windows advises. Ask us before decorating.
How long does the job take?
A typical job takes anything from a few hours to a full day, depending on how many windows, including the preparation. Your quote will say how long we expect yours to take.
What affects the cost of sand mastic
The quote reflects the job in front of us. We take into account:
- The size of the job
- Whether old sealant or filler has to be cut out
- Which sealant suits the joint
- How many rooms, windows or areas are involved
Every job is a little different, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all play a part, and we will explain the quote if you ask.
Helping us quote
Photos by email are helpful but not essential. Please mention:
- Any access issues, like height or stairs
- Whether it has been sealed before
- The address or postcode of the job
- If it’s domestic, commercial or a hotel
Getting a quote is simple: let us know the job and the location and its rough size. A few pictures by email make the job easier to understand.