Hampshire · England
Window & door mastic in Gosport, Hampshire
Mastic around window and door frames, sills and patio doors in Gosport, with a 12-month guarantee on every job. Ask us for a quote.
- Damp patches on the reveal after heavy rain
- Draughty joints inside around the window
- Rushed sealant from a window installation
Frames and glazing around Gosport
Gosport is within about 2 miles 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 window and door frames, which can dry out and crack sooner where a building faces the weather. 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.
For an older house near a landmark such as St Faith's Church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. Schools such as Brockhurst Primary School are buildings too, and the mastic around its windows and doors needs looking after like any other building’s.
Gosport is in Hampshire. Jobs in Gosport get the same care as everywhere else we work: old sealant removed completely, careful preparation and a 12-month guarantee. Our Hampshire coverage runs to 683 places, and Gosport is one of them.
Every address in PO12 and PO13 is within our area for window mastic, from the main roads to the quietest streets. Local streets include Station Road, St Johns Square and Cockleshell Square. Being close to the A32 and B3333, Gosport is simple for us to get to. Other places close to Gosport include Forton (1 mile south-east), Elson (1 mile north), Priddy's Hard (1 mile east), Bridgemary (1 mile north-west) and Rowner (2 miles north-west). Within a short drive, we also cover Havant (8 miles north-east), Eastleigh (14 miles north-west), Fareham (4 miles north-west), Horndean (9 miles north-east), Hedge End (10 miles north-west) and Waterlooville (8 miles north-east). Being one of Hampshire’s larger places, Gosport has every kind of property, from flats to offices.
What’s near Gosport
Locally, jobs take us to homes and businesses close to St Vincent College, Brune Park Community School and Queen's Head pub. Gosport’s nearest station is Portsmouth Harbour station, about 2 miles east. A little further out are Search (1.3 miles south-east) and Gosport War Memorial Hospital (0.8 miles south). For a walk, there’s Portsdown Hill and West of the River Alver.
Window mastic in Gosport
If you can feel air around a shut window, the gap is often at the frame. Resealing that joint can make a room feel noticeably less draughty. Where the air is getting in through the window itself, we’ll say so. Common call-outs are for cracked internal joints between frame and plaster and leaking joints at the ends of sills, on aluminium frames, window sills and patio & French doors.
Gosport mixes older streets, where windows have often been replaced, with newer estates fitted with uPVC. In every case, the joint between frame and wall is what keeps water out.
You are covered for a year from the day we finish. If anything isn’t right with it, phone 0345 464 0079 or send us an email.
- Location
- Gosport (PO12, PO13)
- Wider area
- Hampshire
- Cover
- One year on every job
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Should I try it myself first?
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.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.
Also near Gosport
Also in Gosport
Keeping the joints in good condition
After the cure time, these simple habits help:
- Repaint timber before it’s bare
- Clear any debris from frame drain holes
- Do not paint over the silicone
- Use gentle cleaners on frames and sealant
A yearly look round the frames is enough. Cracks and lifting edges are easy to spot early.
Wet, windy weather is when failed mastic shows itself, but resealing works best in dry conditions. Dealing with it when you first notice a crack avoids chasing leaks through the wet months.
Your questions about window mastic in Gosport
Does the coastal weather in Gosport 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. Walls facing the sea are generally the first to need attention.
Can you do window mastic in Gosport?
Yes, Gosport is within the area we cover. Our work covers London and the South East. Just ring 0345 464 0079 or send us an email with a few details of the job.
Where is Mr Mastic based?
We work from Crawley. Our applicators cover Gosport, along with the rest of our area.
Can you do upstairs windows?
Usually, yes. Access is planned before work begins, so mention the height and anything in the way.
Do I need to be at home?
That depends on where the joints are. For work indoors, someone needs to let us in, and for outside work we’ll agree access with you when we book.
Can I do it myself?
That depends on the joint. High-level, external movement and fire-rated joints are professional jobs, while a short indoor joint may be within reach.
What do you need from me for a quote?
Tell us what needs doing and where, with pictures by email if possible. We’ll ask anything else we need to know.
Do you have sealant for grey or black windows?
Usually, yes. Tell us the frame colour when you get in touch and we’ll match it as closely as we can.
Different surfaces, different methods
Patio & French doors
Water at the foot of a door frame is not always the mastic: worn seals, blocked drainage slots or a poor threshold detail can be the cause. We check before we reseal.
Timber windows & doors
On period timber windows, traditional sand mastic is sometimes the better choice. We can talk through the options.
The process
We work through the job in order: protect, prepare, seal, tidy. For most jobs that takes a few hours for a handful of frames, longer for a whole house and we leave things clean and tidy. In Gosport, parking is rarely complicated, though it helps to know about driveways or restrictions, and mention if the work is upstairs, in a flat or high on the outside.
- Each frame is looked over and we agree which ones need resealing.
- The old mastic is cut out and scraped back to clean surfaces.
- 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
- Let us know about earlier repairs to the joints
- Move anything stored near the joints
- Tell us about any water getting in
Getting a quote
There’s no standard price list, as no two jobs are quite the same. Instead, we give you a clear price for your job. To arrange one, ring 0345 464 0079 or email us.
Advice
For landlords and businesses
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance.
Failed sealant is one of the commonest items on a check-out report, and it’s easy to sort out between tenants. We can quote for more than one property at once.
Do you need window mastic in Gosport?
On timber frames, paint and putty build up around the joint. Mastic painted over many times cracks with the paint, and the wood moves with damp as well as heat.
The problems people normally mention when they call include:
- Cracked sealant at the sill ends
- Draughts coming in around windows and doors
- Gaps between the frame and the inside reveal
- Black, perished sealant on frames
For landlords with property near Portsmouth Harbour station, cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
What your quote should include
- What the cure time is
- Which colour the sealant will be
- Whether they’re fully insured
- Is VAT in the price?
How we quote for window mastic
Call for a quick quote. What matters most is:
- The number of rooms or windows
- The product the joint needs
- Whether old sealant or filler has to be cut out
- Access and height
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, along with when we can work on site. Ask us for a quote and we will explain what it covers.
Helping us quote
Photos by email are helpful but not essential. Please mention:
- The address or postcode of the job
- Any access issues, like height or stairs
- If it’s domestic, commercial or a hotel
- The problem you’ve noticed
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is.