Hampshire · England
Up Somborne Window Mastic
Specialist window mastic for Up Somborne: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Draughty joints inside around the window
- Draughts coming in around windows and doors
- Old mastic that has gone black or come away
About our window mastic in Up Somborne
Colour matters on a frame. We can seal in white, brown, anthracite grey, black or clear, so the line suits the frame instead of standing out. Typical jobs include cracked internal joints between frame and plaster and rain getting in at the frame or under the sill, across timber windows & doors, patio & French doors and window sills.
Outdoor sealant needs dry, clean surfaces, so work on frames around Up Somborne is planned for dry weather. Let us know about access to all the frames, upstairs ones included.
Our work is backed for twelve months.
- Location
- Up Somborne (SO20)
- Wider area
- Hampshire
- Guarantee
- 12 months on all our work
- Price
- A clear price before we start
- Call
- 0345 464 0079
- Updated
- 26 October 2026
DIY sealant or a professional job?
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 fails, we can still redo it.
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
When it isn’t the sealant
We’d rather tell you now than do work that will not last, so here’s what sealant cannot put right:
- Draughts through the window seals rather than the frame
- Faulty window hardware
- Soft or decayed wood in the frame
If in doubt, ring 0345 464 0079 or send us an email and we’ll say what we think before booking.
Joints and surfaces we work on
- Timber windows & doors
- Aluminium frames
- Window sills
- Patio & French doors
- uPVC windows
- Composite doors
The process
We work through the job in order: protect, prepare, seal, tidy. For most jobs that takes a few hours for a few frames, or a day or more for a whole house, and the area is left clean. Somewhere as small as Up Somborne, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- 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.
- Every joint is tooled smooth and checked before we leave.
How to prepare
- Tell us about any previous sealing or DIY attempts
- Mention any sign-in or site rules at work premises
- Mention any leaks or damp you’ve noticed
Getting a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and email photos if that’s easy.
Read more
How we quote for window mastic
We quote each job individually. This is what makes a difference:
- How much old sealant there is and how hard it is to remove
- Whether the work is at height
- When we can work, for business premises
- Whether there’s mould to deal with
A failed joint rarely gets cheaper to fix by waiting. If you’re unsure, phone 0345 464 0079 or email us for an honest opinion and a quote.
Helping us quote
Photos by email are helpful but not essential. Try to tell us:
- A few photos by email, if you can
- Any previous sealing or DIY work
- The type of property
- The problem you’ve noticed
Asking for a quote is easy: let us know what needs doing and where and its rough size. A few pictures by email make the job easier to understand, and we will take it from there.
Up Somborne homes and the weather
Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Around Up Somborne, as everywhere, window mastic is only as good as the preparation behind it. For an older house near a landmark such as All Saints Church, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Up Somborne is about 5 miles north-west of Winchester, in Hampshire. Up Somborne gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a 12-month guarantee. 683 places in Hampshire are on our list, from the larger towns to small villages. Our Southampton page covers work nearby, about 12 miles away.
Our applicators cover all of the SO20 postcode area for window mastic and the streets around it. You will find streets such as Court Lane and Up Somborne Lane, and we cover them all. Other places close to Up Somborne include Little Somborne (1 mile west), Ashley (1 mile south-west), King's Somborne (2 miles south-west), Lower Slackstead (4 miles south) and Braishfield (5 miles south). Within a short drive, we also cover Winchester (5 miles south-east), Eastleigh (9 miles south-east), Andover (9 miles north), Totton (12 miles south), Chandler's Ford (8 miles south) and Hedge End (13 miles south-east).
Local landmarks in Up Somborne
Other landmarks nearby include Royal Hampshire County Hospital (4.9 miles south-east).
Looking after it afterwards
So the new joints stay in good condition:
- Keep paint off silicone joints
- Make sure the drainage slots aren’t blocked
- Air rooms to keep condensation down around windows
- Clean frames with a soft cloth and soapy water
Have a look at the joints once a year, ideally after winter. Cracks and lifting edges are easy to spot early.
Signs to watch for: split or missing mastic, gaps, damp patches inside or black mould on the reveal. Any of these is worth a call.
Also near Up Somborne
Also in Up Somborne
How the job changes by surface
Composite doors
If the door itself is draughty, the issue may be the door seals or hinges rather than the frame mastic. We seal the frame and let you know about anything else.
Patio & French doors
Not every patio door leak is a mastic problem: worn seals, blocked drainage slots or a poor threshold detail can be the cause. We check before we reseal.
Up Somborne questions
Can you do window mastic in Up Somborne?
Yes, Up Somborne is within the area we cover. We work across London and the South East. You can call 0345 464 0079 or send us an email and let us know what needs doing, and we’ll send you a clear quote.
Will you come out to Up Somborne?
Yes, Up Somborne is covered. Our work covers London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Can I do it myself?
Some simple jobs can be done by a careful DIYer. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Will the old sealant be removed?
Yes. All of the old material is cut out and the joint cleaned.
Can you do several jobs on one visit?
Yes, we can. Several rooms, windows or areas can go on one quote.
Do you seal inside as well as outside?
Yes. Indoors, we seal between the frame and the plaster or reveal.
Do the sealants smell?
Possibly a little. Any smell clears as the sealant cures.
Where are you based?
We’re a Crawley-based firm, with over 20 years’ experience. Our area covers South East England, London and Scotland.
Why act early in Up Somborne
Once mastic fails, rain can get between the frame and the wall. Over time that can mean damp patches, damaged plaster and rotting timber. A reseal is a much smaller job. Older cottages and farmhouses around Up Somborne can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
Combining jobs into one visit generally makes better use of the time than several visits, so tell us about everything that needs sealing. We’ll give you a clear quote for the lot.
Why Up Somborne customers choose us
- You choose the colour before work begins
- Tidy, careful work
- Quality sealants from Arbo and Everbuild
- Fully insured