Oxfordshire · England
Sand mastic for sash & case windows in Marsh Gibbon, Oxfordshire
Specialist sand mastic for Marsh Gibbon: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Window mastic to renew ahead of painting
- Draughts and rain around sash boxes
- Open joints round the window box
Marsh Gibbon questions
Is Marsh Gibbon within the area you cover?
Yes, Marsh Gibbon is covered. We work across London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Do you cover Marsh Gibbon for sand mastic?
Yes, Marsh Gibbon is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or drop us an email and tell us what needs doing, and we’ll give you a clear price.
Can old silicone round a sash window be swapped for sand mastic?
Often, yes. Once the silicone is out and the joint prepared, sand mastic is applied by hand.
Do you hold any approvals?
Yes. We are approved under the ARBOMaster scheme.
Do you remove the old sealant?
Yes, always, and completely. New sealant will not bond properly to old, so the joint is cleaned back first.
When will the new mastic be hard?
It takes a while. It skins first and hardens fully later and we’ll give you an idea for your job.
Where do you work from?
Mr Mastic is based in Crawley. We cover Marsh Gibbon and the rest of Oxfordshire.
Can you match the sealant colour?
We will suggest a colour to suit the surroundings. The product needed can limit the range.
Sand mastic in Marsh Gibbon, done properly
Old sand mastic cracks, crumbles and falls out over time, leaving gaps round the window. We rake it out and renew it and tidies the surround. We work on timber door frames, sash and case windows and stone surrounds, and common reasons people get in touch are mastic that needs renewing before redecorating and wind and rain getting in round a sash window.
Outdoor sealant needs dry, clean surfaces, so work on frames around Marsh Gibbon is planned for dry weather. Let us know about access to all the frames, upstairs ones included.
We stand behind the work with a 12-month guarantee, so you’re not left on your own once the job is done.
- Where
- Marsh Gibbon (OX27)
- Region
- Oxfordshire
- Guarantee
- A year, on every job
- Quotes
- A clear price before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Other services in Marsh Gibbon
What sealant work can’t fix
Before you book, it’s worth knowing the limits too:
- Sashes that need overhauling
- Crumbling stone or brickwork round the window
- Timber that has rotted
If in doubt, ring 0345 464 0079 or email us and we’ll say what we think before you book.
Surfaces we seal
- Sash and case windows
- Period & listed homes
- Stone surrounds
- Brick reveals
- Tenement windows
- Timber door frames
What we’re called out for in Marsh Gibbon
Decorating can disturb tired mastic. Many people find it crumbling when they prepare the windows, which is a good time to renew it.
Keep an eye out for these signs:
- Open joints round the window box
- Modern sealant on a period surround
- Draughts and rain around sash boxes
- Failed mastic on an exposed elevation
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.
Before booking anyone
- What happens if the job turns out different
- Whether they seal over old material or remove it
- Which colour the sealant will be
- Are they insured?
What affects the cost of sand mastic
We don’t publish a price list, because no two jobs are the same. The quote depends on:
- Any working-time requirements on site
- Whether there’s mould to deal with
- How much there is to do
- How many areas need sealing
The cost reflects the work involved, not guesswork. That’s why we ask a few questions first and agree the price before starting.
Asking for a quote
To help us quote quickly, let us know:
- What’s wrong with the joints now
- Whether it’s a home or a business
- Whether it has been sealed before
- A few photos by email, if you can
We quote each job on its own, so the first step is telling us about yours. Simply call 0345 464 0079 or drop us an email and describe the job.
Frames and glazing around Marsh Gibbon
Historic houses like Claydon House (about 4.8 miles east) are a reminder that the area around Marsh Gibbon has older buildings as well as new. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic. 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.
For site and facilities teams at buildings such as Marsh Gibbon CofE Primary School, its window and door frames need their mastic kept sound, just like a home’s. Letting a property close to Bicester North station? Then any sash windows need sound mastic to keep draughts and rain out.
Marsh Gibbon is about 4 miles east of Bicester, in Oxfordshire. Across the OX27 area, our applicators can take on sand mastic. Across Oxfordshire, we cover 443 places, Marsh Gibbon among them. Oxford is on our list too, about 13 miles from Marsh Gibbon.
Postcode districts we cover here for sand mastic: OX27. Local streets include Moorhen Close, Westbury Close and Moat Lane. We also cover the places around Marsh Gibbon: Poundon (2 miles north), Charndon (2 miles north-east), Twyford (2 miles north-east), Calvert (3 miles east) and Preston Bissett (4 miles north). Larger places within reach include Oxford (13 miles south-west), Bicester (4 miles west), Thame (11 miles south), Kidlington (11 miles south-west), Chinnor (15 miles south-east) and Headington Quarry (11 miles south-west).
Local landmarks in Marsh Gibbon
Typical jobs here are in homes near Plough Inn, among other places. Marsh Gibbon’s nearest station is Bicester North station, about 3.7 miles west. A little further out are Bicester Community Hospital (4 miles west) and Bicester Village (4 miles west). The countryside around Marsh Gibbon includes Upper Ray Meadows and Graven Hill.
Landlords, agents and businesses in Marsh Gibbon
We regularly work with letting and managing agents. Tell us the address, the job and how access works.
In hotels, rooms out of use cost money, so the work can be planned room by room. We’ve worked in hotels as well as homes and businesses.
What we do, step by step
Our applicators work methodically: protect, prepare, seal, tidy. For most jobs that takes a few hours for a single window, longer for several, and the area is left clean. Somewhere like Marsh Gibbon 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 agree which joints need doing.
- We remove the old, loose mastic.
- We pack any deep voids first.
- The sand mastic is mixed and pressed into the joint by hand.
- The surface is finished to suit the stone or brick.
Preparing for the visit
- Try not to wet indoor joints just before the visit
- Plan for the work area to be out of bounds to pets and children
- Mention any parking rules near the property
How to get a quote
For a quick quote, get us on the phone, or email us if that’s easier. Tell us about the joints that need doing and we’ll talk you through the work before giving you a price.
Related advice
What the job involves on each surface
Stone surrounds
Sand mastic sits naturally against stone. The finish blends with the masonry.
Tenement and terrace windows
Where a building is shared, window work may involve neighbours, so check who is responsible first.
DIY sealant or a professional job?
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
If you’re set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it does not work out, we can still put it right.