Hampshire · England
Sand mastic for sash & case windows in Hythe, Hampshire
Problem with your window and door surrounds in Hythe? We cut out the old, prepare the joints and apply the right sealant, with a 12-month guarantee.
- Open joints round the window box
- Gaps round a timber door in stone or brick
- Weathered mastic on the most exposed windows
DIY versus a professional finish
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
If you’ve already had a go yourself, that is fine. We cut it out and start again.
About our sand mastic in Hythe
For a listed home or one in a conservation area, ask your local planning authority if consent is needed before window work. Sand mastic is often favoured as a like-for-like material. If you are dealing with window mastic to renew ahead of painting and draughty sash windows at the surround, we can help, whatever the surface.
Around Hythe, many houses have gained conservatories, French doors or replacement windows over time. Every addition brings more joints, each wearing at its own pace. Leaks normally start at a sill, a frame head or a glazing joint.
A one-year guarantee comes as standard, so you’re covered after we’ve gone.
- Location
- Hythe (SO45)
- Wider area
- Hampshire
- Guarantee
- A year, on every job
- Quote
- A clear price before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
What sand mastic looks like in Hythe
Hythe is within about 1 mile of the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. Both are hard on the mastic around older windows and doors, which can dry out and crack sooner where a building faces the weather. Historic houses like Medieval Merchant's House (about 2.6 miles north) are a reminder that the area around Hythe has older buildings as well as new. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
Letting a property close to Southampton Town Quay station? Then cracked sand mastic around sash windows lets in the draughts tenants complain about. In the older streets around Church of St John, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Hythe is about 4 miles south of Southampton, in Hampshire. Whether you are in the middle of Hythe or further out, sand mastic is available for homes and businesses alike. Hythe is one of 683 towns and villages in Hampshire we cover for sand mastic.
Every address in SO45 is within our area for sand mastic, from the main roads to the quietest streets. Streets in the area include High Street, Deerleap Close and Langdown Lawn, all of which we cover. We also cover the places around Hythe: Dibden Purlieu (1 mile south-west), Dibden (1 mile west), Marchwood (3 miles north-west), The Hummicks (4 miles south-west) and Beaulieu (4 miles south-west). Larger places within reach include Winchester (14 miles north), Gosport (12 miles east), Eastleigh (8 miles north), Fareham (9 miles east), Totton (6 miles north-west) and Chandler's Ford (9 miles north).
What’s near Hythe
Locally, jobs take us to homes and businesses close to Noadswood School, Testwood School and No.5 (The Lord Nelson Public House). The closest station to Hythe is Southampton Town Quay station, roughly 2.3 miles north of the centre. Well-known places in the area include Netley Castle (2.1 miles north-east) and Westquay (2.9 miles north). For a walk, there’s Mercury Marshes.
Signs you need sand mastic in Hythe
Paint, silicone or cement used over old mastic causes problems. They don’t move with the timber and we normally remove them.
Any of these means the joints need attention:
- Window mastic to renew ahead of painting
- Draughts and rain around sash boxes
- Mastic round period door frames that has failed
- Mastic worn away on windows facing the weather
For site and facilities teams at buildings such as Waterside Primary School, its window and door frames need their mastic kept sound, just like a home’s.
What your quote should include
- How hidden problems are handled
- What the quote includes, VAT included or not
- Whether they’re fully insured
- Whether they seal over old material or remove it
What happens if it’s left?
Before painting the windows, it pays to renew the mastic. Paint over cracked mastic won’t stop the gaps, and the new mastic is traditionally left unpainted. Around Hythe, failed sealant lets water into hidden places, like the floor under a bath, the back of a panel or the inside of a wall. Whatever the joint, failed sealant only gets worse.
The cost reflects the work involved, not guesswork. That is why we ask a few questions first and agree the price before starting.
Why us?
- Arbo and Everbuild products
- A 12-month guarantee on all work
- We never seal over old sealant
- ARBOMaster approved applicator
Take a look at how sealant jobs are priced or our reviews.
When it isn’t the sealant
Honest advice matters more to us than a booking, so here’s what new sealant won’t do:
- Decayed frames that need repair
- Sashes that need overhauling
- Cracked or broken glass
If you’re not sure, just ring 0345 464 0079 or send us an email and we will give you a straight answer.
Surfaces we seal
- Period & listed homes
- Sash and case windows
- Stone surrounds
- Timber door frames
- Brick reveals
- Tenement windows
Your questions about sand mastic in Hythe
Can you do sand mastic in Hythe?
Yes, Hythe is within the area we cover. Our work covers London and the South East. Just call 0345 464 0079 or drop us an email with a few details of the job, and we’ll send you a clear quote.
Does the coastal weather in Hythe affect outside sealant?
Coastal homes put outside sealant through more weather than inland ones, so the choice of sealant and the preparation matter even more. It’s worth checking the walls that face the sea first.
Can landlords and businesses book you?
Yes. As well as householders, we work for landlords, agents, businesses and hotels across Hampshire.
Will the old sealant be removed?
Always. Sealing over the old bead is the commonest cause of early failure, and it’s something we never do.
What’s sand mastic made of?
It’s sand mixed with a linseed-oil-based binder, used between timber frames and stone or brick.
Will you leave a mess?
Very little: the area around the joints is protected first, and we tidy up before we go.
Do you do commercial work?
Yes. Commercial and hotel work is a large part of what we do, as well as homes. We can talk about working times when we quote.
Can tenants book the work?
We’re happy to deal with the tenant, landlord or agent. Just make sure your landlord agrees.
How it works
We keep the work tidy and contained to the joints we’re treating, so you can carry on as normal. Expect the work to take a few hours per window, depending on the condition of the joints. A visit in Hythe needs access to the work and a place to park close by. If the job is outside, mention gates, side access and anything above ground floor.
- We check each window surround and the condition of the joint.
- The joint is raked out and cleaned.
- Large voids are packed out.
- We point the joint with sand mastic by hand.
- The finish is dressed neatly.
Preparing for the visit
- Mention any parking rules near the property
- Keep pets and children clear of the area while we work
- Let us know about stairs, lifts or work at height
Ask for a quote
For a quote, ring 0345 464 0079 or email us and tell us where the job is and what the problem looks like. We will give you a clear quote before any work starts.
Read more
For landlords and businesses
We work for landlords and agents as well as homeowners. Sealant work between tenants keeps a property looking cared for before the next move-in.
If you manage several properties in or around Hythe, several properties can be quoted together. Send us the addresses and the work at each.
How we quote for sand mastic
Call for a quick quote. The main things that affect it are:
- The type of sealant required
- Any mould that needs treating
- The number of rooms or windows
- The old material and how stubborn it is
There are no prices on our website, because each job is priced on what it involves. Call for a quick quote and we’ll talk you through it.
What to tell us for a quote
When you call or email, it’s useful to know:
- Where the property is
- A few photos by email, if you can
- How we’d reach the joints
- Any previous sealing or DIY work
Every job is quoted individually, so start by telling us what you need. Simply phone 0345 464 0079 or email us and describe the job.