Oxfordshire · England
Sand mastic for sash & case windows in Oxford, Oxfordshire
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for householders, landlords and businesses in Oxford. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Draughty sash windows at the surround
- Gaps round a timber door in stone or brick
- Cement or filler used on old window joints that has cracked
Sand mastic for homes and businesses in Oxford
Sand mastic does not last for ever, leaving gaps round the window. We rake it out and renew it and tidies the surround. We work on timber door frames, period & listed homes and sash and case windows, and the jobs we see most are modern sealant on a period surround and weathered mastic on the most exposed windows.
With a large rental market, Oxford has plenty of windows that landlords need to keep weathertight. Gaps around a frame let in draughts and water, and tenants notice.
Our work is backed for twelve months.
- Place
- Oxford (OX4, OX3, OX2, OX1)
- Region
- Oxfordshire
- Guarantee
- 12 months on all our work
- Quote
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Windows and doors in Oxford
London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. With historic houses such as Holywell Manor (about 0.8 miles north-west) nearby, there’s older building stock in the area around Oxford as well as newer homes. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window.
If you look after a building such as East Oxford Primary School, larger buildings have plenty of frames, and the mastic around each one ages. Letting a property close to Oxford station? Then cracked sand mastic around sash windows lets in the draughts tenants complain about.
Oxford is in Oxfordshire. Homes, rented property, offices and hotels in Oxford is covered for sand mastic. Every job comes with our one-year guarantee. Across Oxfordshire, we cover 443 places, and Oxford is one of them.
Postcode districts we cover here for sand mastic: OX4, OX3, OX2 and OX1. We cover properties on High Street, New High Street and Radcliffe Square and the roads around them. Oxford sits on or near the A34 and A40, which makes travel easy. Close by, we work in St Clement's (1 mile west), Headington Hill (1 mile north-east), New Marston (1 mile north), Donnington (1 mile south) and St. Ebbes (1 mile west). Within a short drive, we also cover Didcot (10 miles south), Bicester (11 miles north), Abingdon-on-Thames (6 miles south-west), Witney (11 miles west), Thame (11 miles east) and Wantage (14 miles south-west). Being one of Oxfordshire’s larger places, Oxford has every kind of property, from flats to offices.
Around Oxford
Around Oxford, our work takes us to homes and buildings near The Star pub, Alexander Library of Ornithology and Headington Rye Oxford, among other places. Other local landmarks include Cheney School (less than half a mile east) and South Park (less than half a mile north-east). The nearest railway station is Oxford station, roughly 1.6 miles west. A little further out are Warneford Hospital (less than half a mile east) and Rumble Museum (under half a mile east). Open spaces near Oxford include CS Lewis Nature Reserve and Headington Hill.
How to look after the new joints
No joint lasts for ever, but care makes a real difference. Our tips:
- Make sure water runs off the sill
- Leave the new mastic unpainted
- Go gently near the mastic when preparing windows
- Have rotten timber repaired before new mastic goes in
Keep gutters and sills clear so water runs away from the surround. Water sitting against the mastic shortens its life.
Gaps round a sash box let in draughts and rain. Left, the gap tends to get bigger.
Signs you need sand mastic in Oxford
Previous repairs in cement or silicone often trap water or crack away. They don’t suit the joint and we normally remove them.
The most common problems we see are:
- Patchy fillers round a sash window
- Mastic that needs renewing before redecorating
- Open joints round the window box
- Modern sealant on a period surround
Homes close to St Clement's Church include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Before you book anyone
- How long the guarantee is
- What happens if they find a problem under the old sealant
- When the joint can take water or movement
- Whether VAT is included
What we do, step by step
The work is kept neat and contained to the joints we’re treating, so you can get on with your day. The job usually takes a few hours per window, depending on the condition of the joints, and we tell you how long to leave it before we go. Where a business in Oxford needs to stay open, out-of-hours working can be arranged, while home visits are arranged within our normal working hours, Monday to Saturday.
- We start by checking each surround and agreeing the joints to renew.
- The loose and crumbling mastic is raked out and the joint cleaned.
- Large voids are packed out first, so the mastic isn’t too thick.
- The mastic is mixed, pressed into the joint by hand and shaped.
- The mastic is finished to sit tidily against the stone or brick.
How to prepare
- Plan for the work area to be out of bounds to pets and children
- Mention any sign-in or site rules at work premises
- Where the joints are inside, avoid wetting them before we arrive
Ask for a quote
For a quote, phone 0345 464 0079 or drop us an email with the location and a short description of the problem. You’ll have a clear quote before we start.
Related advice
How the job changes by surface
Period and listed homes
Many older homes were built with sand mastic round the windows. If your home is listed, ask your local planning authority about consent.
Stone surrounds
The stone is treated with care while raking out the old mastic.
Can I do it myself?
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
A DIY attempt does not rule out a professional job. We remove it and do the joint properly, so tell us about it when you ask for a quote.
FAQs for Oxford
Can you help a landlord with a rental near Oxford station?
Yes. We work for landlords and letting agents as well as householders, and several properties can be quoted together. Just call 0345 464 0079 or drop us an email with the address and what needs doing, and we’ll give you a clear quote.
Can you do sand mastic in Oxford?
Yes, Oxford is within the area we cover. We work across London and the South East. You can call 0345 464 0079 or email us and let us know what needs doing, and we will give you a clear quote.
Is there any odour?
Possibly a little. Any smell clears as the sealant cures, and ventilation helps.
Can sand mastic be painted?
Traditional guidance is not to paint over sand mastic. Ask us before you decorate around it and we’ll advise.
How long does sand mastic take?
A typical job takes a few hours per window, depending on the condition of the joints, including the preparation. We will confirm how long when we quote.
Where are you based?
Mr Mastic is based in Crawley. Our applicators cover Oxford, along with the rest of our area.
When will the new mastic be hard?
It forms a skin fairly soon, then hardens over a longer period. Timing depends on the weather and the joint.
Do I need permission for sand mastic on a listed building?
It’s best to ask your local planning authority first. Sand mastic is often favoured as like for like, but they decide.
Honest limits
New sealant can’t fix everything, and we will tell you before any work starts. It will not solve:
- Masonry that needs repairing
- Rotten sashes, sills or window boxes (a joiner’s job)
- Cracked or broken glass
Not sure which it is? You can call 0345 464 0079 or email us and we will tell you honestly.
Surfaces we seal
- Stone surrounds
- Brick reveals
- Period & listed homes
- Sash and case windows
- Timber door frames
- Tenement windows
What happens if it’s left?
Not every draught comes from the sashes themselves. Open mastic joints round the box can let air in, and renewing the mastic closes them. In a busy place like Oxford, a failed joint in a flat or office can send water into the space below, where it can go unnoticed until the damage is done.
Doing several joints on one visit generally makes better use of the time than several visits, so it’s worth mentioning everything you’d like done. You will get one clear quote for the whole job.
Why book with us
- A 12-month guarantee on all work
- Any old sealant cut out fully, not covered over
- Sanitary silicone with an anti-fungal additive in wet areas
- More than 20 years in sealant work
Take a look at our cost guide and customer reviews.