Hampshire · England
Selborne Window Mastic
Window mastic in Selborne from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- White mastic on grey or black frames
- Untidy mastic left by window fitters
- Cracked internal joints between frame and plaster
Window mastic in Selborne
Behind a thin line of old mastic there’s sometimes a deep void. Packing it solid with sealant gives a joint that cannot flex, so deep gaps get backing rod first. That way the new bead bonds to the frame and the wall only. We work on timber windows & doors, patio & French doors and aluminium frames, and common reasons people get in touch are leaking joints at the ends of sills and mastic that’s falling out in pieces.
Mastic can only go onto a dry, clean joint, so window work in Selborne is booked around the forecast. Let us know about access to all the frames, upstairs ones included.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we’ll sort it.
- Place
- Selborne (GU34)
- Region
- Hampshire
- Guarantee
- A year, on every job
- Price
- A clear price before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Signs you need window mastic in Selborne
Frames are never completely still. A plastic or aluminium frame lengthens in sunshine and shortens as it cools, while the masonry beside it stays put. A sealant that cannot keep up eventually tears.
Look out for these signs:
- Cold air getting in at the frame edge
- Leaking joints at the ends of sills
- Black, perished sealant on frames
- Cracked or shrunken mastic around the frame
Rented homes near Alton station change hands often, and sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Comparing quotes
- What happens if they find a problem under the old sealant
- Is VAT in the price?
- Whether they’re fully insured
- Whether the sealant suits the joint
How the job changes by surface
Timber windows & doors
Soft or rotten wood can’t be sealed successfully. If we find rot, we will tell you before going ahead, as a joiner will need to deal with it.
Patio & French doors
Door frames take knocks and movement every time the doors are used. The sealant must cope with it without cracking.
DIY versus a professional finish
A DIY attempt doesn’t rule out a professional job. We cut it out and start again.
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
Nearby places to Selborne
Also in Selborne
Your questions about window mastic in Selborne
Do you cover Selborne for window mastic?
Yes, Selborne is within the area we cover. Our work covers London and the South East. You can phone 0345 464 0079 or drop us an email and let us know what needs doing.
Do you cover smaller places like Selborne?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Can I paint over the new sealant?
It depends on the sealant. Some hybrid sealants can be painted; silicone can’t. Tell us if you’re decorating and we’ll choose accordingly.
Will it make a mess?
Tidy work is part of the job. We protect what’s around the joints, and we clear up when we are done.
Can resealing stop a draught around my window?
Yes, if the air is getting in around the frame. If it’s coming through the window seals, we will tell you.
Can you seal over the old sealant?
No, because it fails. We remove every bit of old sealant first, so the new sealant bonds properly.
What does window mastic cost?
It depends on the job, so we quote each one individually. To get one, call 0345 464 0079 or drop us an email and tell us what needs doing and where.
Can you do upstairs windows?
Yes, in most cases. We plan safe access before the job.
How to look after the new joints
Once the sealant has cured, a few habits help it last:
- Wash the frames with mild soapy water
- Check the mastic once a year
- Keep paint and stain on wooden frames in good order
- Do not aim a pressure washer at the joints
Keep the new mastic undisturbed while it cures, following the cure time we give you. Keep jet washers away from the frames.
Water gets in quietly when mastic fails. Often the first sign is a damp patch inside or flaking paint on the reveal. Catching it early keeps the fix to a reseal.
Quotes for window mastic in Selborne
The quote reflects the job in front of us. We look at:
- The size of the job
- How many rooms, windows or areas are involved
- Mould in or behind the old joints
- Whether the work is at height
Homes and businesses are quoted the same way: how much there is to do, how we reach it and what it needs, plus any working-time requirements on site. Call for a quick quote and we’ll explain what it covers.
What to tell us for a quote
Photos help, but a description is a good start. Please mention:
- A few pictures by email, if you can
- How many joints, rooms or windows are involved
- What the problem is, such as mould, gaps, leaks or cracking
- Where the property is
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is. When it suits you, phone 0345 464 0079 or send us an email.
What we can’t put right
Before you book, it’s worth knowing the limits:
- Misting between the panes of a double-glazed unit (that needs a new unit)
- Damp coming through the wall itself rather than the frame joint
- A sash or casement that won’t close properly
Not sure which it is? You can call 0345 464 0079 or send us an email and we’ll tell you honestly before booking.
Joints and surfaces we work on
- Timber windows & doors
- uPVC windows
- Patio & French doors
- Aluminium frames
- Window sills
- Composite doors
The process
You do not need to clear the whole room or building before we come, only the area right around the joints. We protect the rest, and the job takes a morning for a couple of windows and a door for a typical job. For a village or hamlet like Selborne, 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.
- 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.
- A flexible exterior sealant is applied in a colour to suit the frame.
- We tool each bead neatly and check every joint is closed.
Before we arrive
- Let us know about earlier repairs to the joints
- Keep pets and children clear of the area while we work
- Move anything stored near the joints
Ask for a quote
Want a quote for window mastic? Please phone 0345 464 0079 or email us with a few details. We will explain what we’d do and give you a clear price before work begins.
Advice
Frames and glazing around Selborne
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 site and facilities teams at buildings such as Selborne Church of England Primary School, the mastic around its windows and doors needs looking after like any other building’s. If you live in an older home near Church of St Mary, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Selborne is about 4 miles south of Alton, in Hampshire. From the centre of Selborne to the outskirts, we cover window mastic for every kind of property. 683 places in Hampshire are on our list, large and small. Our Portsmouth page covers work nearby, about 21 miles away.
Our applicators cover all of the GU34 postcode area for window mastic and the streets around it. That includes homes and businesses on Huckers Lane, Ganders Close and Selborne Road. We also cover the places around Selborne: Newton Valence (1 mile west), Empshott (2 miles south-east), Lower Green (3 miles south), Hawkley (3 miles south) and Oakshott (4 miles south). Within a short drive, we also cover Basingstoke (13 miles north-west), Fleet (13 miles north), Horndean (14 miles south), Aldershot (13 miles north-east), Alton (4 miles north) and Waterlooville (15 miles south).
Near you in Selborne
Typical jobs here are in homes near The Jubilee Tap. The closest station to Selborne is Alton station, about 3.8 miles north of the centre. Well-known places in the area include The Romany Museum (within half a mile south-east) and Alton Community Hospital (3.5 miles north-west). For a walk, there’s Selborne Hill and Deadwater Valley.