Oxfordshire · England
Middle Assendon Sand Mastic
Traditional burnt sand mastic around sash and case windows and doors in stone and brick for homes and businesses in Middle Assendon and across Oxfordshire. Fully insured, ARBOMaster approved and guaranteed for a year.
- Wind and rain getting in round a sash window
- Weathered mastic on the most exposed windows
- Gaps between timber frames and stone or brick
What affects the cost of sand mastic
There’s no set price list, because no two jobs are the same. What we look at:
- The type of sealant required
- The number and length of the joints
- Any mould that needs treating
- When we can work, for business premises
Combining jobs into one visit is generally more efficient than separate visits. We will send you a clear quote for the lot.
Asking for a quote
What to tell us when you ask for a quote:
- The address or postcode of the job
- Any previous sealing or DIY work
- Access, such as stairs, a lift or height
- The problem you’ve noticed
Every job is quoted individually. Just ring 0345 464 0079 or drop us an email with the details.
Sand mastic for homes and businesses in Middle Assendon
On many period windows, sand mastic looks right and suits the building. On modern frames we’d normally use a flexible sealant and we will explain which is best for yours. We work on tenement windows, timber door frames and stone surrounds, and common reasons people get in touch are draughts and rain around sash boxes and a silicone bead on a sash window that spoils the look.
In a village or hamlet like Middle Assendon, older cottages and farmhouses often have timber windows set in stone or brick. Older buildings like these don’t always suit modern silicone, and sometimes a traditional sand mastic is the better choice.
All of our work is guaranteed for twelve months.
- Location
- Middle Assendon (RG9)
- Wider area
- Oxfordshire
- Guarantee
- One year on every job
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Keeping the joints in good condition
Simple care keeps the joints in good condition. We recommend:
- Sort the mastic before the decorators arrive
- Check with your local planning authority if your home is listed
- Make sure water runs off the sill
- Do not paint over the new mastic
Do not run silicone over the new mastic. If anything cracks, get it looked at rather than patching it.
Once mastic starts to crumble, rain gets in. That water can reach the timber frame and the wall, so renewing it early is worth it.
How the visit works
Every visit runs the same way: we check the joints, mask and protect the surrounding surfaces, do the work and clear up. Most jobs take anything from a few hours to a full day, depending on how many windows. For a village or hamlet like Middle Assendon, the journey is planned in advance: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- Each surround is checked first.
- We rake out the old mastic and clean the joint.
- Large voids are packed out.
- New sand mastic is applied and shaped by hand.
- The finish is dressed neatly.
How to prepare
- Keep pets and children clear of the area while we work
- Where the joints are inside, avoid wetting them before we arrive
- Let us know about earlier repairs to the joints
How to get a quote
There’s no standard price list. Instead, your job gets its own clear quote. To arrange one, ring 0345 464 0079 or drop us an email.
Advice
Why deal with it now?
Cement-based fillers and modern sealants do not always suit a period surround. Sand mastic is the like-for-like choice and that can be important for listed homes. Around Middle Assendon, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
What it costs depends on the size of the job, how hard the old material is to remove and access to the work. We give a clear quote before we start.
Why Middle Assendon clients choose us
- More than 20 years in sealant work
- Arbo and Everbuild products
- Anti-fungal silicone where joints get wet
- 4.9 on Google from 180+ five-star reviews
See what affects the cost and customer reviews.
Surface by surface
Stone surrounds
Stone openings are rarely perfectly straight, so the gap is not the same all the way round. We shape it by hand to follow the stone.
Timber door frames
Sand mastic is used round timber door frames too. We renew it the same way as on windows.
What we can’t put right
It helps to know what we can’t do too:
- Timber that has rotted
- Sashes that need overhauling
- Cracked or broken glass
Not sure which it is? You can call 0345 464 0079 or email us and we will tell you honestly before you book.
Where we work in Middle Assendon
- Tenement windows
- Stone surrounds
- Period & listed homes
- Brick reveals
- Sash and case windows
- Timber door frames
Nearby places to Middle Assendon
Also in Middle Assendon
What sand mastic looks like in Middle Assendon
London and the South East are among the drier parts 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 Greys Court (about 1.8 miles south-west) nearby, there’s older building stock in the area around Middle Assendon as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
If you let a flat or house near Henley-On-Thames station, cracked sand mastic around sash windows lets in the draughts tenants complain about. In the older streets around Church of St James, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Middle Assendon is about 6 miles north of Caversham, in Oxfordshire. Whether you’re in the middle of Middle Assendon or further out, we cover sand mastic for every kind of property, from flats and houses to offices and hotels. Middle Assendon is one of 443 towns and villages in Oxfordshire we cover for sand mastic. Our Reading page covers work nearby (8 miles or so).
All of RG9 is covered for sand mastic, from the main roads to the quietest streets. If you need sand mastic at a property on Fawley Bottom Lane and White Lane or anywhere close by, we can help. We also cover the places around Middle Assendon: Bix (1 mile south-west), Fawley Bottom (1 mile north-east), Lower Assendon (1 mile south-east), Fawley (1 mile east) and Catslip (2 miles west). Within a short drive, we also cover Didcot (14 miles west), Thame (12 miles north), Henley-on-Thames (3 miles south-east), Benson (8 miles north-west), Chinnor (9 miles north) and Tilehurst (9 miles south-west).
What’s near Middle Assendon
Around Middle Assendon, our work takes us to homes and buildings near Fawley Court and Temple Island and Rainbow Inn, among other places. For rail, the closest station is Henley-On-Thames station, about 2.7 miles south-east of the centre. Other landmarks nearby include Frazer Nash Archives (3.1 miles south-east). Green spaces nearby include Warburg Nature Reserve.
Your questions about sand mastic in Middle Assendon
Can you do sand mastic in Middle Assendon?
Yes. We work across London and the South East, and Middle Assendon is part of that. Just ring 0345 464 0079 or drop us an email with a few details of the job.
I let a flat near Henley-On-Thames station. Can you help?
Yes, rental work is part of what we do. You can call 0345 464 0079 or send us an email with the address and a few details, and we will give you a fixed price before any work starts.
Is there any odour?
Some sealants have a smell while they cure. Opening a window helps.
Which products do you use?
It depends on the joint: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.
Is the work guaranteed?
Every job comes with our one-year guarantee.
Do you offer different sealant colours?
Yes. White, clear and grey are common, and other colours are available for many products, and we will agree it with you first.
Are you fully insured?
Yes, we are fully insured.
Can you do several jobs on one visit?
Yes, and it often makes sense. Combining jobs makes good use of the visit, so mention them when you ask for a quote.
DIY versus a professional finish
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.