Hampshire · England
Sand mastic for sash & case windows in Segensworth, Hampshire
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for Segensworth, backed by a one-year guarantee. Call for a quick quote.
- Cement or filler used on old window joints that has cracked
- Gaps where the frame meets the masonry
- Old sand mastic that has cracked, crumbled or fallen out
Frames and glazing around Segensworth
Segensworth is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. Both are hard on the mastic around older windows and doors, which can dry out and crack sooner where a building faces the weather. London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Schools such as Cornerstone CofE (VA) Primary School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages. Rented homes near Swanwick station change hands often, and older sash windows in a rental need their mastic kept sound to keep the weather out.
Segensworth is about 3 miles north-west of Fareham, in Hampshire. Every kind of property in Segensworth can book us for sand mastic. Every job comes with our one-year guarantee. Segensworth is one of 683 towns and villages in Hampshire we cover. We also work in Southampton, around 7 miles away.
All of PO15 and SO31 is covered for sand mastic, from the main roads to the quietest streets. If you need sand mastic at a property on Witherbed Lane, Brunel Way and Concorde Way or anywhere close by, our applicators can take on the job. Other places close to Segensworth include Titchfield Park (1 mile south), Park Gate (1 mile west), Locks Heath (1 mile south-west), Whiteley (1 mile north) and Titchfield Common (1 mile south-west). Further out, we also cover Winchester (13 miles north), Gosport (6 miles south-east), Havant (11 miles east), Eastleigh (8 miles north-west), Fareham (3 miles south-east) and Horndean (11 miles east).
Landmarks near Segensworth
We work in homes and buildings around The Henry Cort Community College, among other places. The closest station to Segensworth is Swanwick station, roughly 0.9 miles north-west of the centre. Well-known places in the area include Fareham Community Hospital (1.2 miles west) and St Andrew's Castle (3.2 miles west). Green spaces nearby include Swanwick Lakes.
Sand mastic in Segensworth, done properly
Silicone on a period window often looks wrong and doesn’t suit the building. Sand mastic is the traditional choice, and we can replace one with the other. We are often asked to deal with crumbling sand mastic round a window and silicone on a period window that looks wrong, across period & listed homes, timber door frames and stone surrounds.
Somewhere as small as Segensworth, older homes often have timber frames set in stone or brickwork. Not every older frame suits a modern silicone bead, so the sealant has to be chosen to suit the building.
Each job carries a 12-month guarantee, whatever its size.
- Place
- Segensworth (PO15, SO31)
- Region
- Hampshire
- Cover
- A year, on every job
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
The process
All our tools and materials come with us in the van, so there’s nothing for you to buy. After a quick look at the joints together, the area is protected and the work begins. Most jobs take a few hours per window, depending on the condition of the joints. For a village or hamlet like Segensworth, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- 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.
- We finish the mastic to a tidy line.
Preparing for the visit
- Keep pets and children clear of the area while we work
- Clear the area around the work
- For indoor joints, keep the area dry beforehand if you can
Ask for a quote
To get a quote, call 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. You’ll have a clear quote before any work starts.
Related advice
How we quote for sand mastic
Every job gets its own quote. These are the things that affect it:
- How much there is to do
- Whether the work is at height
- How much old sealant there is and how hard it is to remove
- The product the joint needs
What you pay reflects the work, not guesswork. That is why we ask a few questions first and agree the price before starting.
What we need to know
When you contact us, it’s useful to know:
- If it’s domestic, commercial or a hotel
- If someone has resealed it before
- Roughly how big the job is
- The address or postcode of the job
Getting a quote is simple: tell us what needs doing and where and its rough size. A few pictures by email make the job easier to understand.
What we are called out for in Segensworth
Shallow joints are a common cause. Mastic that’s too thin cracks and drops out, which is why we pack deep voids first and get the depth right.
Look out for these signs:
- Mastic that needs renewing before redecorating
- Open joints round the window box
- Old sand mastic that has cracked, crumbled or fallen out
- A silicone bead on a sash window that spoils the look
If you live in an older home near St John, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Before booking anyone
- Which sealant they’ll use, and why
- How hidden problems are handled
- When the joint can take water or movement
- Whether VAT is included
What the job involves on each surface
Tenement and terrace windows
Windows above ground floor need the right access. Let us know the floor and we’ll confirm access.
Period and listed homes
Materials matter on listed and conservation-area homes. Like-for-like sand mastic is generally favoured.
Landlords, agents and businesses in Segensworth
In hotels, rooms out of use cost money, so the work can be planned room by room. We’ve worked in hotels as well as homes and businesses.
For anyone letting property in or around Segensworth, jobs at different addresses can go on one quote. Just tell us the addresses and what each one needs.
DIY versus a professional finish
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Segensworth: your questions answered
Will you come out to Segensworth?
Yes, we do. We work across London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Does living near the coast affect sand mastic in Segensworth?
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.
Is it messy?
Very little: the area around the joints is protected first, and we tidy up before we go.
How do I get a quote for sand mastic in Segensworth?
It depends on the job, so we quote each one individually. For a quick quote, call 0345 464 0079 or drop us an email with a short description of the job.
Do you remove the old sealant?
Yes. All of the old material is cut out and the joint cleaned before applying anything new.
How long will you be here?
It depends on the size of the job, but as a guide it takes a few hours for a single window, longer for several. We’ll tell you when we quote.
Can I choose the sealant colour?
We help you choose a colour that suits, from white and clear to greys and other shades. The choice depends on the product the joint needs.
Do I have to be there?
That depends on where the joints are. Inside work needs someone to give us access, while outside work can sometimes be arranged differently.
Also near Segensworth
Also in Segensworth
Why deal with it now?
If you’re redecorating, renew the mastic first. Paint over cracked mastic will not stop the gaps, and the new mastic is traditionally left unpainted. Where a wall is exposed, as many are in small places like Segensworth, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
Instead of a standard rate, we look at what your job involves: the amount of work, the old material and the access. You’ll know the price before we begin.
Why choose Mr Mastic in Segensworth
- Sanitary silicone with an anti-fungal additive in wet areas
- Approved under the ARBOMaster scheme
- Every job guaranteed for a year
- 4.9 on Google from 180+ five-star reviews
See what affects the cost or our reviews.