Oxfordshire · England
Sand Mastic in Long Wittenham
Sand mastic across Long Wittenham and nearby, with old sealant always removed completely and a 12-month guarantee.
- Mastic that needs renewing before redecorating
- Patchy fillers round a sash window
- Modern sealant on a period surround
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.
Hotels need rooms back in use, so we plan the work room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.
Sand mastic in Long Wittenham, done properly
We work across Long Wittenham renewing sand mastic on sash windows and doors. Every joint is cleaned out and filled by hand, finished to suit the masonry. We work on sash and case windows, period & listed homes and brick reveals, and common reasons people get in touch are mastic that needs renewing before redecorating and draughty sash windows at the surround.
Somewhere as small as Long Wittenham, older homes often have timber frames set in stone or brickwork. Not every older frame suits a modern silicone bead, so the sealant has to be chosen to suit the building.
You’re covered for a year from the day we finish. If there’s a problem with it, please call 0345 464 0079 or send us an email.
- Location
- Long Wittenham (OX14)
- Wider area
- Oxfordshire
- Cover
- A year, on every job
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026

Frames and glazing around Long Wittenham
Historic houses like Clifton Hampden Manor (about 1.2 miles north) are a reminder that the area around Long Wittenham has older buildings as well as new. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window. London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Letting a property close to Appleford station? Then older sash windows in a rental need their mastic kept sound to keep the weather out. Schools such as Long Wittenham (Church of England) Primary School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages. For an older house near a landmark such as Church of St Mary, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Long Wittenham is about 3 miles north-east of Didcot, in Oxfordshire. Whether you are in the middle of Long Wittenham or further out, we cover sand mastic for every kind of property, from flats and houses to offices and hotels. Long Wittenham is one of 443 towns and villages in Oxfordshire we cover. There’s also a page for Oxford, about 8 miles away.
Our applicators cover all of the OX14 postcode area for sand mastic. Whether your property is on High Street, Didcot Road and Wessex Way or a nearby road, our applicators can take on the job. If you are just outside Long Wittenham, we cover Clifton Hampden (1 mile north), Appleford-on-Thames (1 mile west), Culham (2 miles north-west), Didcot (3 miles south-west) and Sutton Courtenay (3 miles west). Larger places within reach include Oxford (8 miles north), Abingdon-on-Thames (4 miles north-west), Thame (13 miles north-east), Wantage (10 miles west), Henley-on-Thames (15 miles south-east) and Grove (9 miles west).
Near you in Long Wittenham
Around Long Wittenham, our work takes us to homes and buildings near The Plough Public House. Long Wittenham’s nearest station is Appleford station, about 1.3 miles west of the centre. Well-known places in the area include Brightwell Castle (2.6 miles south-east) and Pendon Museum (under half a mile west). Open spaces near Long Wittenham include Wittenham Clumps and Mowbray Fields.
Nearby places to Long Wittenham
Also in Long Wittenham
Why act early in Long Wittenham
An open joint round the frame lets weather in. Left, water can reach the timber and the wall so renewing it early protects the window. Older cottages and farmhouses around Long Wittenham can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
Doing several joints on one visit is normally more efficient than separate visits. We’ll give you a clear quote for the lot.
Why us?
- Anti-fungal sanitary silicone in wet areas
- Domestic, commercial and hotel work
- Trusted Arbo and Everbuild sealants
- An ARBOMaster approved applicator
See our cost guide and customer reviews.
Surface by surface
Stone surrounds
Sand mastic sits naturally against stone. The finish blends with the masonry.
Timber door frames
A neat sand mastic joint round a front door suits a period home.
Should I try it myself first?
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
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.
What affects the cost of sand mastic
Jobs vary more than people expect. The main factors:
- The number and length of the joints
- Any mould that needs treating
- Whether the work is at height
- The old material and how stubborn it is
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed. Ask us for a quote and we’ll explain what it covers.
Helping us quote
You do not need to know the technical terms. Just tell us:
- Pictures of the joints, sent by email
- Whether it has been sealed before
- The rough size of the job
- Where the job is, and your postcode
Want a quote for sand mastic? Please ring 0345 464 0079 or email us and tell us about the job. You will know what we plan to do, and what it will cost, before any work begins.
The process
On the day, there’s very little for you to do. Show us the job and we’ll take it from there. The job generally takes a few hours for a single window, longer for several, including the tidy-up. Somewhere as small as Long Wittenham, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- First we agree which joints need doing.
- We remove the old, loose mastic.
- We pack any deep voids first.
- We apply the mastic by hand and shape it.
- The surface is finished to suit the stone or brick.
Before we arrive
- Let us know about stairs, lifts or work at height
- Tell us about any previous sealing or DIY attempts
- Tell us about any water getting in
How to get a quote
To get a quote, ring 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. We’ll give you a clear price before any work starts.
Advice
When something else is needed
Some problems need a builder, plumber or other trade rather than us:
- Planning or listed building consent (your local planning authority decides)
- Masonry that needs repairing
- Rotten sashes, sills or window boxes (a joiner’s job)
Not sure which it is? You can phone 0345 464 0079 or send us an email and we’ll tell you honestly before booking.
What we seal
- Sash and case windows
- Brick reveals
- Period & listed homes
- Tenement windows
- Timber door frames
- Stone surrounds
Long Wittenham questions
Do you cover Long Wittenham for sand mastic?
Yes. We work across London and the South East, and Long Wittenham is part of that. You can call 0345 464 0079 or email us and tell us what needs doing.
Will you come out to Long Wittenham?
Yes, Long Wittenham is covered. Our work covers London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
How much does sand mastic cost in Long Wittenham?
The cost depends on the size of the job, access and how much old sealant has to come out. Call for a quick quote.
Can you seal over the old sealant?
No. We remove every bit of old sealant first.
Is it worth trying it myself?
Sometimes. Preparation is everything: all the old sealant out, and a clean, dry joint. If it doesn’t work out, we can redo it.
Is the work guaranteed?
Every job comes with our one-year guarantee.
Do you have insurance?
Yes. Mr Mastic is fully insured, with over 20 years’ experience in sealant work.
Is sand mastic better than silicone for my windows?
We’ll talk it through with you. Sand mastic suits many period homes and newer frames suit modern sealant.
