Hampshire · England
Window & door mastic in Gosport, Hampshire
Window and door frames in Gosport need attention? We cut out the old, prepare the joints and apply the right sealant.
- Mastic that has split away from the wall
- Gaps left after new windows were fitted
- Draughts coming in around windows and doors
Should I try it myself first?
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 doesn’t work out, we can still put it right.
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
About our window mastic in Gosport
The new joint doesn’t have to be white. We can seal in white, brown, anthracite grey, black or clear, so the line suits the frame instead of standing out. We work on timber windows & doors, aluminium frames and patio & French doors, and common reasons people get in touch are mastic that’s falling out in pieces and cracked sealant at the sill ends.
In a village or hamlet like Gosport, older cottages and farmhouses often have timber windows set in stone or brick. Not every older frame suits a modern silicone bead, so the sealant has to be chosen to suit the building.
All our work comes with a one-year guarantee.
- Location
- Gosport (SO51)
- Wider area
- Hampshire
- Guarantee
- A year, on every job
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Gosport questions
Do you cover Gosport for window mastic?
Yes, Gosport is within the area we cover. Our work covers London and the South East. You can ring 0345 464 0079 or email us and let us know what needs doing.
Do you work for landlords with property near Chandlers Ford station?
Yes, landlords and agents are among the people we work for. Just call 0345 464 0079 or email us with the address and what needs doing, and we’ll give you a clear quote.
Does the work come with a guarantee?
Yes, with our 12-month guarantee. A yearly look at the joints helps them last.
Do the sealants smell?
It depends on the product. Some products have a noticeable smell, others very little.
How long before the joint can be used?
Cure times vary by product and the temperature. Before we leave, we’ll tell you the cure time.
Will you leave a mess?
We keep the work tidy. We protect what’s around the joints, and we clear up when we are done.
How do I get a quote for window mastic in Gosport?
It depends on the job, so we quote each one individually. For a quick quote, call 0345 464 0079 or send us an email with a short description of the job.
Can new window sealant be painted?
Not if it’s silicone. Tell us your decorating plans and we’ll pick a sealant to suit.
Window mastic in Gosport: local notes
The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
In the older streets around Church of St Mark, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. If you let a flat or house near Chandlers Ford station, cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
Gosport is about 2 miles east of Romsey, in Hampshire. Anywhere in SO51, our applicators can take on window mastic. Gosport is one of 683 places in Hampshire where we work for window mastic. For nearby work, see our Southampton page, about 6 miles away.
Work in SO51 is quoted and booked the same way as anywhere else. Nearby, we also carry out window mastic in Ampfield (1 mile north-east), Crampmoor (1 mile west), Knapp (1 mile north-east), Broadgate (1 mile east) and Lower Slackstead (2 miles north). Larger places within reach include Winchester (6 miles north-east), Eastleigh (5 miles south-east), Fareham (15 miles south-east), Andover (14 miles north), Totton (7 miles south-west) and Hedge End (8 miles south-east).
Local landmarks in Gosport
Typical jobs here are in homes near White Horse Public House and The Mountbatten School and the streets around them. The closest station to Gosport is Chandlers Ford station, about 2.6 miles south-east of the centre. Nearby you’ll also find King Johns House (2.9 miles west) and Romsey Community Hospital (2.2 miles west). The countryside around Gosport includes Emer Bog and Baddesley Common.
Also near Gosport
What else we do in Gosport
Keeping the joints in good condition
Simple care keeps the joints in good condition. We recommend:
- Wash the frames with mild soapy water
- Walk round the house once a year and look at the joints
- Don’t paint over the silicone
- Keep solvents and bleach off the sealant
Check the drainage slots in the frames are not blocked, so water can run away instead of sitting against the joint.
Water gets in quietly when mastic fails. Often the first sign is a damp patch inside or flaking paint on the reveal. Early resealing stops it reaching that point.
When to call us in Gosport
Joints that are too thin or too deep fail early. A skim of sealant over a wide gap soon tears, while a joint packed solid can’t stretch. That is what backing rod is for.
If you can see any of these, it’s time to have the joints looked at:
- Gaps where the sill meets the wall
- Damp patches on the reveal after heavy rain
- Sealant in the wrong colour for the frame
- Cracked internal joints between frame and plaster
Schools such as Ampfield Church of England Primary School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages.
What your quote should include
- How the colour is chosen
- Whether the sealant suits the joint
- Are they insured?
- How the surfaces are prepared before sealing
How we quote for window mastic
Your quote is based on your job. We take into account:
- How many rooms, windows or areas are involved
- Any working-time requirements on site
- Whether the work is at height
- How much old sealant there is and how hard it is to remove
Leaving a failed joint generally makes the job bigger, not smaller, because water and mould keep working on it. If you’re not sure whether it needs doing, ring 0345 464 0079 or drop us an email for an honest opinion and a quote.
What to tell us for a quote
Photos by email are helpful but not essential. Try to tell us:
- Any previous sealing or DIY work
- A few photos by email, if you can
- The problem you’ve noticed
- Access, such as stairs, a lift or height
To get a quote, call 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. You’ll have a clear quote before work begins.
When something else is needed
Some problems need a builder, plumber or other trade rather than us:
- Broken hinges, locks or handles
- Draughts through the window seals rather than the frame
- Damp coming through the wall itself rather than the frame joint
If you are not sure, just call 0345 464 0079 or send us an email and we will give you a straight answer before booking.
Joints and surfaces we work on
- Aluminium frames
- Window sills
- Patio & French doors
- uPVC windows
- Timber windows & doors
- Composite doors
Landlords, agents and businesses in Gosport
We work for landlords and agents as well as householders. Sealant work between tenants is a simple way to keep a property in good order before the next move-in.
Mouldy or split sealant often shows up at the end of a tenancy. Several properties can go on one quote.
The process
There’s no need to move everything out before we come, only the area right around the joints. We protect the rest, and the work takes a morning for a couple of windows and a door in most cases. For a village or hamlet like Gosport, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- First, we go round the frames with you and agree the list.
- We remove the old mastic and clean the frame edge and wall.
- Deep gaps get closed-cell backing rod to set the depth.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- We tool each bead neatly and check every joint is closed.
Getting ready for the visit
- Mention any tricky access
- Keep pets and children clear of the area while we work
- Where the joints are inside, avoid wetting them before we arrive
Ask for a quote
For a quick quote, get us on the phone, or send an email if you’d rather. Describe what needs sealing and we will explain what’s involved.