Oxfordshire · England
Window & door mastic in Somerton, Oxfordshire
Specialist window mastic for Somerton: the right sealant, proper preparation and a neat finish. Call for a quick quote.
- Leaking joints at the ends of sills
- Black, perished sealant on frames
- Rain getting in at the frame or under the sill
Window mastic in Somerton
There are two joints on most windows. Outside, the mastic keeps rain out; the internal joint closes the gap to the plaster and stops draughts. Either or both can be done. If you are dealing with hard, cracked sealant around windows and water coming in at the bottom corners of a door, we can help, whatever the surface.
Outdoor sealant needs dry, clean surfaces, so work on frames around Somerton is planned for dry weather. Let us know about access to all the frames, upstairs ones included.
Every job is covered by our 12-month guarantee, wherever you are in Oxfordshire.
- Where
- Somerton (OX25)
- Wider area
- Oxfordshire
- Guarantee
- 12 months on all our work
- Quote
- A clear price before we start
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Can I do it myself?
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
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.
For landlords and businesses
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. We can quote for more than one property at once.
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements.
How the job changes by surface
Timber windows & doors
Soft or rotten wood can’t be sealed successfully. We’ll point out any rot we find, as that’s a job for a joiner.
Composite doors
A composite door normally sits in a plastic outer frame, so its perimeter joint is sealed much like a window. The bead is colour-matched to the frame.
Honest limits
We’ll always be straight with you, so here’s what new sealant will not do:
- A frame that has rotted at the joint
- Misting between the panes of a double-glazed unit (that needs a new unit)
- Worn gaskets, brush seals or a door that has dropped
If in doubt, call 0345 464 0079 or email us and we’ll say what we think before you book.
What we seal
- Composite doors
- Window sills
- uPVC windows
- Patio & French doors
- Aluminium frames
- Timber windows & doors
What window mastic looks like in Somerton
Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
For landlords with property near Heyford station, cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets. In the older streets around Church of St James, the joint between an old wall and a newer frame is normally the first place rain gets in.
Somerton is about 6 miles north-west of Bicester, in Oxfordshire. Whether you’re in the middle of Somerton or further out, we cover window mastic for every kind of property, from flats and houses to offices and hotels. Our Oxfordshire coverage runs to 443 places, Somerton among them. You can also see our page for Oxford, roughly 14 miles from Somerton.
All of OX25 is within our area for window mastic. Streets in the area include Water Street, Wharf Lane and Ardley Road, and we cover them all. We also cover Fritwell (2 miles east), Clifton (2 miles north), Upper Heyford (2 miles south), Souldern (2 miles north-east) and Lower Heyford (3 miles south). Within a short drive, we also cover Oxford (14 miles south), Banbury (8 miles north), Bicester (6 miles south-east), Witney (15 miles south-west), Kidlington (9 miles south) and Headington Quarry (14 miles south).
Around Somerton
For rail, the closest station is Heyford station, roughly 2.7 miles south of the centre. A little further out are Deddington Castle (2.4 miles north-west).
How the visit works
On the day, there’s very little for you to do. Show us the job and we’ll take it from there. The work itself takes a morning for a couple of windows and a door, including the tidy-up. Somewhere like Somerton needs a little journey planning: 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 confirm safe access to each frame.
- All the failed sealant is cut away.
- The surfaces are cleaned and left dry.
- Deep voids are backed, then the sealant is gunned in.
- The joint is shaped to shed water and the area tidied.
How to prepare
- Mention if the joints have been sealed before
- Let us know about stairs, lifts or work at height
- Where the joints are inside, avoid wetting them before we arrive
Ask for a quote
For window mastic in Somerton, call 0345 464 0079 or send us an email. A short description of the job and where it is helps us quote, and we will agree the price before any work begins.
Advice
Aftercare tips
Aftercare is simple, and it makes a real difference:
- Check the mastic once a year
- Make sure the drainage slots aren’t blocked
- Avoid blasting the frames with a pressure washer
- Do not paint over the silicone
Clean the frames with mild soapy water, and keep solvents and harsh chemicals off the joint.
Signs to watch for: cracks in the mastic, gaps you can see light through, damp on the reveal or mould around the inside of the frame. If you notice one, it’s time to get the joint looked at.
Somerton: your questions answered
Do you cover smaller places like Somerton?
Yes, Somerton is covered. Our work covers London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Do you cover Somerton for window mastic?
Yes, Somerton is within the area we cover. Our work covers London and the South East. Just ring 0345 464 0079 or drop us an email with a few details of the job, and we’ll give you a clear price.
Do you hold any approvals?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we’re part of it.
Can tenants book the work?
We can work for tenants, landlords or agents. Just make sure your landlord agrees.
Where do you work from?
Mr Mastic is based in Crawley. We cover Somerton and the rest of Oxfordshire.
Can you match the sealant to my frames?
Yes. White, brown, anthracite grey, black and clear sealants are all available.
Can landlords and businesses book you?
Yes. As well as homeowners, we work for landlords, agents, businesses and hotels in Somerton.
How do I get a quote for window mastic in Somerton?
Size, access and the old material all affect the cost. Call for a quick quote.
Towns and villages near Somerton
Other services in Somerton
Quotes for window mastic in Somerton
Jobs vary more than people expect. What affects the quote:
- Whether the work is at height
- Working hours on commercial sites
- The number and length of the joints
- Whether old sealant or filler has to be cut out
Doing several joints on one visit is normally more efficient than separate visits, so it’s worth mentioning everything you’d like done. You will get one clear quote for the whole job.
What to tell us for a quote
When you contact us, these details help:
- Where the job is, and your postcode
- Photos by email, if that is easy
- What’s wrong with the joints now
- Any access issues, like height or stairs
We quote each job on its own, so the first step is telling us about yours. Just ring 0345 464 0079 or drop us an email with the details, and photos are welcome.