Hampshire · England
Window & door mastic in Long Sutton, Hampshire
Specialist window mastic for Long Sutton: careful preparation, the right product and tidy work. Call for a quick quote.
- White mastic on grey or black frames
- Draughty joints inside around the window
- Draughts coming in around windows and doors
Landlord and commercial work in Long Sutton
Housing providers, facilities teams and property managers book us too. Several sites can go on one quote, and we’re fully insured.
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Resealing at the right time is simple maintenance that we can handle for you.
Window mastic in Long Sutton, done properly
Every window and door frame has a gap around it, and mastic is what closes it. Once that seal fails, wind and rain find the gap. Our applicators cut it out and replace it with a flexible, weatherproof sealant. We work on window sills, timber windows & doors and uPVC windows, and common reasons people get in touch are white mastic on grey or black frames and water coming in at the bottom corners of a door.
Homes in small places like Long Sutton often stand in the open, with little to shelter their windows from wind and rain. That exposure dries out and cracks the mastic around frames and sills faster.
There’s a 12-month guarantee on every job.
- Location
- Long Sutton (RG29)
- Region
- Hampshire
- Cover
- A year, on every job
- Quote
- A clear price before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Frames and glazing around Long Sutton
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.
Managing a site like Long Sutton Church of England Primary School? Then its window and door frames need their mastic kept sound, just like a home’s. Letting a property close to Bentley (Hampshire) station? Then sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Long Sutton is about 5 miles north of Alton, in Hampshire. Long Sutton gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a one-year guarantee. Our area takes in 683 places across Hampshire, large and small. We also work in Reading, about 16 miles from Long Sutton.
Here we cover the RG29 postcode area for window mastic. Whether your property is on The Street, Wingate Meadow and Wingate Lane or anywhere close by, we can help. Neighbouring places we cover for window mastic include South Warnborough (1 mile west), Well (1 mile east), Bidden (2 miles west), Odiham (2 miles north) and Little Hoddington (2 miles west). Further out, we also cover Basingstoke (8 miles north-west), Farnborough (9 miles north-east), Fleet (6 miles north-east), Aldershot (8 miles east), Alton (5 miles south) and Petersfield (15 miles south).
Around Long Sutton
Around Long Sutton, our work takes us to homes and buildings near Lord Wandsworth College and Robert May's School and the streets around them. The nearest railway station is Bentley (Hampshire) station, about 4.2 miles south-east. Nearby you will also find Odiham Castle (3 miles north) and Alton Community Hospital (5.8 miles south). For a walk, there’s Dogmersfield Lake and Holybourne Hill.
How it works
We bring everything the job needs with us. After a quick look at the joints together, the area is protected and the work begins. Most jobs take a morning for a couple of windows and a door. For a village or hamlet like Long Sutton, the journey is planned in advance: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- We check each frame and agree which ones need doing.
- The old mastic is cut out and the surfaces cleaned back.
- Deep gaps are filled with backing rod to set the depth.
- A flexible, weatherproof sealant is applied in a colour to suit the frame.
- Finally we tidy up and check each joint.
Getting ready for the visit
- Where the joints are inside, avoid wetting them before we arrive
- Tell us about access, such as stairs, a lift or high-level joints
- Let us know if you’ve seen damp or leaks
Getting 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
Why it’s worth doing now in Long Sutton
Once mastic fails, rain can get between the frame and the wall. Left long enough, it can stain inside walls, spoil plaster and rot wooden frames. A reseal is a much smaller job. Around Long Sutton, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Commercial jobs are quoted on the same basis as homes: how much there is to do, how we reach it and what it needs, plus any working-time requirements on site. Ask us for a quote and we will explain what it covers.
Why choose Mr Mastic in Long Sutton
- A 12-month guarantee on all work
- An ARBOMaster approved applicator
- Fully insured
- 20+ years of sealant experience
See our cost guide or our reviews.
Aftercare tips
Simple care keeps the joints in good condition. Our advice:
- Keep paint and stain on wooden frames in good order
- Don’t aim a pressure washer at the joints
- Make sure the drainage slots aren’t blocked
- Check the mastic once a year
A yearly look round the frames is enough. Small splits are simple to catch before they leak, and if anything looks wrong, just call 0345 464 0079 or send us an email.
A failed joint lets water into the wall a little at a time. You might not see it until plaster blows or a damp patch appears inside. Catching it early keeps the fix to a reseal.
Questions from Long Sutton
Do you cover smaller places like Long Sutton?
Yes, we do. Our work covers London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Is Long Sutton in your area for window mastic?
Yes. Our work covers London and the South East, and Long Sutton is part of that. You can ring 0345 464 0079 or email us and let us know what needs doing.
Will the old sealant be removed?
Yes, every time. New sealant won’t bond properly to old, so the joint is cleaned back first.
Is it OK to seal over old sealant?
No. The old sealant always comes out first, so the new joint bonds to clean surfaces.
Are you fully insured?
Yes. We are fully insured for every job we do.
Does the work come with a guarantee?
Yes. Our 12-month guarantee covers every job, inside or out.
Should I try DIY first?
That depends on the joint. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional, while a short indoor joint may be within reach.
Do you seal inside as well as outside?
Yes. Draughts often come through the inside gap too, so sealing both is often worthwhile.
When it isn’t the sealant
We won’t take on work that will not last, so these are the limits:
- Penetrating damp from a failed cavity tray or render
- Soft or decayed wood in the frame
- Condensation trapped between the panes
Not sure which it is? You can ring 0345 464 0079 or email us and we’ll tell you honestly.
What we seal
- uPVC windows
- Window sills
- Timber windows & doors
- Patio & French doors
- Aluminium frames
- Composite doors
Common problems we fix in Long Sutton
A lot of older mastic was never designed to stay flexible. Once it has hardened, the frame’s movement tears it from the wall, leaving a hairline gap down one side.
If you can see any of these, it’s time to have the joints looked at:
- Old mastic that has gone black or come away
- Untidy mastic left by window fitters
- Gaps where the sill meets the wall
- Sealant in the wrong colour for the frame
For an older house near a landmark such as Church of All Saints, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
What to look for in a quote
- Is the old sealant removed completely?
- What happens if they find a problem under the old sealant
- Is VAT in the price?
- Which sealant they’ll use, and why
What the job involves on each surface
uPVC windows
The frame is cleaned with a product that won’t harm the plastic, then the sealant goes in between frame and wall.
Aluminium frames
Aluminium needs a sealant that bonds to coated metal. Neutral-cure sealant is the safe choice.