Oxfordshire · England
Cassington Sand Mastic
Specialist sand mastic for Cassington: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Mastic that needs renewing before redecorating
- Gaps between timber frames and stone or brick
- Draughts and rain around sash boxes
Surface by surface
Stone surrounds
Stone surrounds suit sand mastic well. It finishes to look like part of the surround.
Period and listed homes
Sand mastic is the like-for-like choice for many period homes. On listed buildings, check with your planning authority first.
Sand mastic for homes and businesses in Cassington
A silicone bead around a sash window can look out of place and doesn’t suit the building. Sand mastic gives a finish that matches the age of the house and we can swap the silicone for it. We work on sash and case windows, stone surrounds and brick reveals, and people most often call us about window mastic to renew ahead of painting and mastic dropping out of the joint.
Mastic can only go onto a dry, clean joint, so window work in Cassington is booked around the forecast. Let us know about access to all the frames, upstairs ones included.
The work is covered for a year after we finish. If there’s a problem with it, please phone 0345 464 0079 or email us.
- Location
- Cassington (OX29)
- Region
- Oxfordshire
- Cover
- One year on every job
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Common problems we fix in Cassington
Water gets into small cracks in the mastic and loosens it further. Exposed elevations usually fail first.
The problems people generally mention when they call are:
- Gaps between timber frames and stone or brick
- Silicone on a period window that looks wrong
- Mastic dropping out of the joint
- Wind and rain getting in round a sash window
For landlords with property near Hanborough station, older sash windows in a rental need their mastic kept sound to keep the weather out.
Before you book anyone
- What insurance they hold
- Whether they seal over old material or remove it
- Which sealant they’ll use, and why
- How the surfaces are prepared before sealing
Honest limits
A few problems are outside what sealant work can do:
- Decisions on consent for listed homes
- Putty and glazing repairs
- Timber that has rotted
If you are not sure, just ring 0345 464 0079 or send us an email and we will give you a straight answer.
Joints and surfaces we work on
- Brick reveals
- Sash and case windows
- Timber door frames
- Period & listed homes
- Stone surrounds
- Tenement windows
Aftercare tips
After the cure time, these simple habits help:
- Get any rot dealt with first
- Leave the new mastic unpainted
- Keep sills and gutters clear so water drains away
- Plan mastic work ahead of painting
Avoid sealing over the mastic with silicone. If anything cracks, get it looked at before trying a quick fix.
Small cracks are a sign the mastic is ageing. Renewing it then is simpler than waiting until it falls out.
Places near Cassington
Other services in Cassington
What sand mastic looks like in Cassington
Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. With historic houses such as Blenheim Palace (about 3.4 miles north) nearby, there’s older building stock in the area around Cassington as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
For site and facilities teams at buildings such as St Peter's Church of England Primary School, the mastic around its windows and doors needs looking after like any other building’s. In the older streets around Church of St Peter, the joint between an old wall and a newer frame is normally the first place rain gets in.
Cassington is about 6 miles north-west of Oxford, in Oxfordshire. Anywhere in OX29, we can carry out sand mastic at your property. Cassington is one of 443 towns and villages in Oxfordshire where we work. Oxford is on our list too, around 6 miles away.
Our applicators cover all of the OX29 postcode area for sand mastic. Whether your property is on Church Lane, The Green and Pound Lane or anywhere close by, we can help. Other places close to Cassington include Swinford (1 mile south-west), Eynsham (2 miles south-west), Wytham (2 miles south-east), Farmoor (2 miles south) and Filchampstead (3 miles south). We also work in nearby towns such as Oxford (6 miles south-east), Didcot (13 miles south), Bicester (11 miles north-east), Abingdon-on-Thames (8 miles south), Witney (6 miles west) and Carterton (11 miles west).
Near you in Cassington
Typical jobs here are in homes near Bartholomew School and Chequers Inn and the streets around them. For rail, the closest station is Hanborough station, roughly 2.5 miles north-west. A little further out are Oxford Castle and earlier settlement remains (4.5 miles south-east) and Radcliffe Infirmary (4.1 miles south-east). For a walk, there’s Hook Meadow and The Trap Grounds and Cumnor Hill.
Cassington: your questions answered
Is Cassington in your area for sand mastic?
Yes, Cassington is within the area we cover. We work across London and the South East. You can phone 0345 464 0079 or drop us an email and tell us what needs doing.
Do you work for landlords with property near Hanborough station?
Yes, we work for landlords and letting agents. Just phone 0345 464 0079 or send us an email and tell us about the property, and we will give you a clear price.
Do you work for hotels and businesses?
Yes. Commercial and hotel work is a large part of what we do, as well as homes. Working times can be discussed when we quote.
How much does sand mastic cost in Cassington?
Size, access and the old material all affect the cost. Ask us for a quote.
Do I need to be at home?
We need access to the joints, so we will agree that with you when we book. Indoors, that generally means someone at home.
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. Your quote will say how long we expect yours to take.
Will it make a mess?
Not at all. We work neatly, protect the area around the joints and tidy up afterwards.
What guarantee comes with the work?
Our 12-month guarantee applies on every job.
How it works
A visit follows a simple pattern: we check the joints, protect the area around them, carry out the job and tidy away. It usually takes a few hours for a single window, longer for several. Somewhere as small as Cassington, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- First, we look at the surrounds with you and agree what needs doing.
- Old, loose mastic is raked out and the joint cleaned.
- We pack any deep gaps so the mastic sits at the right depth.
- Sand mastic is mixed and applied by hand, then shaped to the joint.
- We dress the surface so it sits neatly against the masonry.
How to prepare
- Clear items away from the joints we’re working on
- Tell us about access, such as stairs, a lift or high-level joints
- Tell us about any water getting in
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 explain what’s involved before giving you a price.
Related advice
Landlords, agents and businesses in Cassington
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. We can quote for more than one property at once.
If you manage several properties in or around Cassington, several properties can be quoted together. Send us the addresses and the work at each, and photos by email help.
What happens if it’s left?
Replacing sash windows is a big decision for a period home and on a listed home, consent may be needed. Where the frames are in good order, new mastic seals the surround. In a small place like Cassington, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
No two jobs are quite the same, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all play a part, and we will explain the quote if you ask.
Why Cassington clients choose us
- 4.9 on Google from 180+ five-star reviews
- Anti-fungal sanitary silicone in wet areas
- Domestic, commercial and hotel work
- Arbo and Everbuild products