Hampshire · England
Window Mastic in Welborne
Mastic around window and door frames, sills and patio doors in Welborne, with a one-year guarantee on every job. Call for a quick quote.
- Mastic that’s falling out in pieces
- Gaps left after new windows were fitted
- Leaking joints at the ends of sills
Aftercare tips
Good habits help new joints last longer. Our tips:
- Keep paint off silicone joints
- Avoid blasting the frames with a pressure washer
- Keep paint and stain on wooden frames in good order
- Wash the frames with mild soapy water
Keep the new mastic undisturbed while it cures, for as long as we advise. Keep jet washers away from the frames.
On timber windows, water behind the joint can lead to rot. Once wood has rotted, it needs repair before it can be sealed, so it pays to reseal before that happens.
About our window mastic in Welborne
Frames and walls don’t move together. Plastic and aluminium frames move with the temperature, while masonry stays fairly still. That’s why the joint needs a flexible, low-modulus sealant rather than something rigid. We work on window sills, uPVC windows and timber windows & doors, and common reasons people get in touch are gaps between the frame and the inside reveal and whistling draughts around closed windows.
Mastic can only go onto a dry, clean joint, so window work in Welborne is booked around the forecast. Let us know about access to all the frames, upstairs ones included.
All of our work is guaranteed for twelve months, in Welborne and everywhere else we cover.
- Location
- Welborne (PO17)
- Region
- Hampshire
- Cover
- A year, on every job
- Price
- A clear price before work begins
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
What we can’t put right
Before booking, it’s worth knowing the limits too:
- Draughts through the window seals rather than the frame
- A failed sealed unit that has misted up
- A frame that has rotted at the joint
Not sure which it is? You can ring 0345 464 0079 or drop us an email and we’ll tell you honestly.
What we seal
- Composite doors
- Window sills
- Patio & French doors
- uPVC windows
- Timber windows & doors
- Aluminium frames
How the visit works
Good joint work is mostly preparation, and we don’t rush it. Every joint is cleaned and dried before new material goes in. In total, it generally takes most of a day for a typical house, less for a few frames. Somewhere like Welborne needs a little journey planning: 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 how each frame can be reached safely.
- Old, cracked mastic is removed completely, along with any loose debris.
- Frame and wall are cleaned and must be dry before sealing, and primed where the sealant calls for it.
- Backing rod fills deep voids and the sealant goes in on top.
- The joint is shaped to shed water and the area tidied.
Getting ready for the visit
- Keep pets and children clear of the area while we work
- Let us know about earlier repairs to the joints
- On commercial sites, let us know about site rules
Getting a quote
There’s no standard price list. Instead, your job gets its own clear quote. To arrange one, ring 0345 464 0079 or email us.
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Work for landlords, hotels and businesses
We also work for property managers and facilities teams. Several sites can go on one quote, and we’re fully insured for the work.
From a single let to a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
Frames and glazing around Welborne
Welborne is close to 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, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
If you let a flat or house near Fareham station, sound mastic around windows and doors keeps out the draughts and damp that tenants notice first. If you look after a building such as The Henry Cort Community College, its window and door frames need their mastic kept sound, just like a home’s.
Welborne is about 2 miles north of Fareham, in Hampshire. Welborne gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. 683 places in Hampshire are on our list, from the larger towns to small villages. Our Portsmouth page covers work nearby, about 7 miles away.
Every address in PO17 is within our area for window mastic, from the main roads to the quietest streets. Other places close to Welborne include Crockerhill (1 mile east), Wickham Common (1 mile north-east), North Fareham (1 mile south-east), Hundred Acres (2 miles north-east) and Fareham (2 miles south). Larger places within reach include Winchester (13 miles north-west), Gosport (6 miles south), Havant (9 miles east), Eastleigh (9 miles north-west), Horndean (8 miles east) and Totton (14 miles west).
Local landmarks in Welborne
Around Welborne, our work takes us to homes and buildings near The Miners Arms and the streets around them. Welborne’s nearest station is Fareham station, about 1.9 miles south of the centre. Other landmarks nearby include Carron Row Farm Museum (2.4 miles south-west) and Portchester Castle (4.5 miles south-east). Not far away are Portsdown Hill and Swanwick Lakes.
Should I try it myself first?
A DIY attempt does not rule out a professional job. We cut it out and start again, so tell us about it when you ask for a quote.
If you are set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it doesn’t work out, we can still put it right.
Welborne questions
Does living near the coast affect window mastic in Welborne?
Coastal homes put outside sealant through more weather than inland ones, so preparation and the right sealant matter all the more. It’s worth checking the walls that face the sea first.
Do you work for landlords with property near Fareham station?
Yes, landlords and agents are among the people we work for. You can call 0345 464 0079 or send us an email with the details for a clear quote.
Will there be a smell?
Possibly a little. It fades as the sealant cures.
What sealant do you use?
Products from Arbo and Everbuild, among others, picked for each joint. We’ll tell you what we are using and why.
Do you come to Welborne?
Yes. We work in Welborne. To book, phone 0345 464 0079 or drop us an email.
Do you remove the old sealant?
Yes, every time. New silicone doesn’t stick to old silicone, so the joint is cleaned back first.
Does the work come with a guarantee?
Yes. All our work carries a 12-month guarantee, and we’re fully insured.
Can I paint over the new sealant?
Silicone generally will not take paint. Let us know beforehand, and we’ll use a paintable product where it suits.
Places near Welborne
What else we do in Welborne
Do you need window mastic in Welborne?
Frames are never completely still. Sun on a frame makes it expand, and it contracts again overnight, while the masonry beside it stays put. A sealant that cannot keep up eventually tears.
The problems people usually mention when they call are:
- Draughts coming in around windows and doors
- Rushed sealant from a window installation
- Cracked internal joints between frame and plaster
- Sealant in the wrong colour for the frame
If you live in an older home near Church of St Francis, the joint between an old wall and a newer frame is generally the first place rain gets in.
What your quote should include
- How the colour is chosen
- What the cure time is
- Whether all the old sealant comes out first
- How the surfaces are prepared before sealing
What happens if it’s left?
Getting a straight, even bead on an outside frame takes practice, especially on upper floors. We cut out properly, back deep gaps and tool every joint neatly, using a product chosen for the frame and wall. In a small place like Welborne, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
Homes and businesses are quoted the same way: the amount of work, the access and the products needed, along with when we can work on site. Call for a quick quote and we will go through it with you.
Why book with us
- Rated 4.9 stars on Google
- Anti-fungal sanitary silicone in wet areas
- Any old sealant cut out fully, not covered over
- Colour agreed with you before we start
Take a look at what affects the cost or customer reviews.