Hampshire · England
Sand mastic for sash & case windows in Lower Swanwick, Hampshire
Sand mastic for Lower Swanwick, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Silicone on a period window that looks wrong
- Weathered mastic on the most exposed windows
- Wind and rain getting in round a sash window
Sand mastic in Lower Swanwick, done properly
Traditional burnt sand mastic that sits naturally against stone and brick. It suits period and listed homes where a modern sealant bead would stand out. We are often asked to deal with gaps round a timber door in stone or brick and tired mastic found when preparing windows for paint, across brick reveals, tenement windows and sash and case windows.
Mastic can only go onto a dry, clean joint, so window work in Lower Swanwick is booked around the forecast. Tell us about access to every side of the house, including upper-floor windows.
Every job comes with our 12-month guarantee.
- Location
- Lower Swanwick (SO31)
- Wider area
- Hampshire
- Cover
- A year, on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Honest limits
Some problems need a builder, plumber or other trade rather than us:
- Damaged stone surrounds
- Sashes that rattle, stick or will not open
- Whether work needs listed building consent
If you are not sure, just phone 0345 464 0079 or email us and we will give you a straight answer.
Surfaces we seal
- Brick reveals
- Stone surrounds
- Sash and case windows
- Period & listed homes
- Tenement windows
- Timber door frames
Also in Lower Swanwick
Aftercare tips
Looking after new joints is easy, and it makes a real difference:
- Avoid patching sand mastic with silicone
- Ask the planning authority about consent for listed or conservation-area homes
- Get any rot dealt with first
- Leave the new mastic unpainted
Look at the mastic when you look over the windows. Small cracks are easier to deal with early.
Gaps round a sash box let in draughts and rain. Left, the gap tends to get bigger.
What happens if it’s left?
An open joint round the frame lets weather in. Left, water can reach the timber and the wall, so dealing with it now protects both. Where a wall is exposed, as many are in small places like Lower Swanwick, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Rather than a set price list, we look at what your job involves: the amount of work, the old material and the access. You will know the price before we begin.
Why Lower Swanwick customers choose us
- Rated 4.9 stars on Google
- We never seal over old sealant
- A 12-month guarantee on all work
- Fully insured
See our cost guide and our reviews.
Questions from Lower Swanwick
Do you cover smaller places like Lower Swanwick?
Yes, Lower Swanwick is covered. We work across London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Can you help a landlord with a rental near Bursledon 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 will send you a clear quote.
Can you work on commercial sites?
Yes. Commercial and hotel work is a large part of what we do, as well as homes. Working times can be discussed when we quote.
Do you offer different sealant colours?
In most cases you can choose. We will explain which colours are available.
Do you have insurance?
Yes. Full insurance covers our work.
Is it messy?
Not at all. The area is protected while we work and cleaned up afterwards.
Which products do you use?
We choose the sealant for the joint, not the other way round. Where it moves, gets wet or faces the weather makes a difference.
Can sand mastic be painted?
Sand mastic is normally left unpainted, which is what traditional guidance recommends. Ask us before decorating.
The process
At the end, we look at the finished work together. The work normally takes a few hours for a single window, longer for several, depending on the size of the job. Somewhere as small as Lower Swanwick, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- First we agree which joints need doing.
- We remove the old, loose mastic.
- We pack any deep voids first.
- The sand mastic is mixed and pressed into the joint by hand.
- The surface is finished to suit the stone or brick.
Preparing for the visit
- Keep children and pets away from the work area
- Mention any leaks or damp you’ve noticed
- On commercial sites, let us know about site rules
How to get a quote
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is.
Related advice
What sand mastic looks like in Lower Swanwick
Lower Swanwick is within about 2 miles of the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. That’s hard on the mastic around older windows and doors, especially on the side facing the sea. London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
For landlords with property near Bursledon station, any sash windows need sound mastic to keep draughts and rain out. For site and facilities teams at buildings such as Bursledon Church of England Infant School, larger buildings have plenty of frames, and the mastic around each one ages.
Lower Swanwick is about 2 miles west of Whiteley, in Hampshire. Whether you’re in the middle of Lower Swanwick or further out, we cover sand mastic for every kind of property, from flats and houses to offices and hotels. Our area takes in 683 places across Hampshire.
We cover every part of the SO31 postcode area for sand mastic. We cover properties on Green Lane, Bridge Road and Station Road and the roads around them. Other places close to Lower Swanwick include Swanwick (1 mile south-east), Sarisbury (1 mile south-east), Sarisbury Green (1 mile south), Park Gate (2 miles south-east) and Burridge (2 miles east). Within a short drive, we also cover Winchester (12 miles north), Gosport (8 miles south-east), Havant (14 miles east), Eastleigh (6 miles north), Fareham (5 miles south-east) and Horndean (13 miles east).
Landmarks near Lower Swanwick
Typical jobs here are in homes near Brookfield Community School and Language College and The Old Ship Inn, among other places. There’s a railway station in Lower Swanwick itself: Bursledon station. A little further out are St Andrew's Castle (2.4 miles south) and Bursledon Brickworks Industrial Museum (within half a mile north-east). Open spaces near Lower Swanwick include Swanwick Lakes.
What we’re called out for in Lower Swanwick
Some old mastic was never deep enough. Mastic that is too thin cracks and drops out, which is why we pack deep voids first and get the depth right.
Signs it’s time to call us include:
- Wind and rain getting in round a sash window
- Silicone on a period window that looks wrong
- Mastic that needs renewing before redecorating
- Crumbling sand mastic round a window
For an older house near a landmark such as Church of St Leonard, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
What your quote should include
- Who does the work, and how experienced they are
- What happens if they find a problem under the old sealant
- How the surfaces are prepared before sealing
- What product goes in the joint
Different surfaces, different methods
Tenement and terrace windows
In shared buildings, the windows may be part of a wider repair, so check who is responsible first.
Brick reveals
An open joint at a brick reveal lets weather in. Renewing the mastic closes it.
Landlords, agents and businesses in Lower Swanwick
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we’ll give you a quote.
Landlords and letting agents in Lower Swanwick can book us as well as householders. Resealing between tenancies keeps a property looking cared for.