Oxfordshire · England
External Mastic in Chesterton
External mastic across Chesterton and nearby, with every bit of old sealant taken out first and a 12-month guarantee.
- Damp patches traced to an open external joint
- Joints pointed up with cement by mistake
- Plants rooting in failed movement joints
What the job involves on each surface
Concrete and blockwork
Concrete and block walls shrink as they dry and move with temperature. We reseal their joints with backing rod and a flexible product.
Brickwork movement joints
People sometimes point up a brick movement joint by mistake. If that’s happened, we rake it out and reseal it properly where it can be done safely.
About our external mastic in Chesterton
Failed sealant is cut out, the depth set with closed-cell backing rod, and the joint resealed with a low-modulus sealant made for outside. We pick a colour that sits well with the wall so the line blends in. We work on concrete & block, render & cladding joints and joints between brick and frames, and people most often call us about sealant that has lost its bond to the brick or render and moss and dirt in joints with no sealant left.
Around Chesterton, older buildings can be stone, brick or timber-framed, many with extensions added later. The joints where those materials meet are the weak points, and they need the right sealant at the right depth.
The work is covered for a year after we finish. If there’s a problem with it, please call 0345 464 0079 or send us an email.
- Place
- Chesterton (OX26)
- Region
- Oxfordshire
- Cover
- One year on every job
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
When it isn’t the sealant
Honest advice matters more to us than a booking, so here’s what new sealant won’t do:
- Damp that isn’t coming from the joint
- Subsidence or other structural problems
- Loose or hollow render, which needs re-rendering
If you’re not sure, just phone 0345 464 0079 or email us and we will give you a straight answer before you book.
Joints and surfaces we work on
- Joints between brick and frames
- Concrete & block
- Render & cladding joints
- Brickwork movement joints
- Façade panels
- Copings & trims
DIY sealant or a professional job?
If you’ve already had a go yourself, that’s fine. We cut it out and start again, so just mention it when you contact us.
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Chesterton questions
Do you cover smaller places like Chesterton?
Yes. Chesterton is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
I let a flat near Bicester Village station. Can you help?
Yes. We work for letting agents and landlords as well as householders. You can call 0345 464 0079 or drop us an email with the details for a clear quote.
Can you quote for more than one area?
Yes, and it often makes sense. Combining jobs makes good use of the visit.
Do you do commercial work?
Yes. Commercial and hotel work is a large part of what we do. We can talk about working times when we quote.
How do you reach high-level joints?
That depends on the building and the joints. We work on joints that can be reached safely. Give us some details and we’ll confirm the access.
What is backing rod for?
The foam is closed-cell backing rod. It stops the sealant going in too deep and bonding to three sides, which would stop it stretching.
What sealant do you use?
The product depends on the job: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.
Do I need to be at home?
It depends on the job. Inside work needs someone to give us access, and for outside work we’ll agree access with you when we book.
Towns and villages near Chesterton
More services for Chesterton
For landlords and businesses
Failed sealant is one of the commonest items on a check-out report, and it’s quick to put right between tenancies. We can quote for more than one property at once.
From a single let to a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
How it works
Before we leave, we go over the finished joints with you. The visit itself generally takes a few hours for a handful of joints, longer for a whole elevation, depending on the amount of work. Somewhere as small as Chesterton, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- We look at every joint and agree a colour to suit the wall.
- Failed sealant is removed back to clean, sound faces.
- Backing rod goes in so the sealant can stretch between the two faces.
- Primer is applied wherever the sealant needs it.
- We gun in low-modulus sealant and tool it neatly.
How to prepare
- Tell us about any water getting in
- Move anything stored near the joints
- Plan for the work area to be out of bounds to pets and children
Get a quote
We do not publish a price list, because every job is different. Instead, your job gets its own clear quote. To get started, ring 0345 464 0079 or send us an email.
Related advice
What affects the cost of external mastic
The price is agreed before any work begins. It takes into account:
- Which sealant suits the joint
- Mould in or behind the old joints
- How easy the joints are to reach
- The amount of work
The cost depends on how much there is to do, how much old material has to come out and how easy the joints are to reach. You will have a clear quote before any work starts, so you know where you stand.
What we need to know
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- If it’s domestic, commercial or a hotel
- Any access issues, like height or stairs
- Whether it has been sealed before
- Roughly how big the job is
For a quote, ring 0345 464 0079 or drop us an email with the location and a short description of the problem. We’ll send you a clear quote before any work starts.
Walls and rooflines in Chesterton
The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
For an older house near a landmark such as Church of St Mary, old and new materials meet at the roofline and walls, which is where sealant earns its keep. For site and facilities teams at buildings such as Chesterton Church of England Voluntary Aided Primary School, larger buildings have long runs of movement joint that eventually need resealing. If you let a flat or house near Bicester Village station, failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Chesterton is about 2 miles south-west of Bicester, in Oxfordshire. Across the OX26 area, we cover external mastic for homes and businesses. 443 places in Oxfordshire are on our list, from the larger towns to small villages. We also work in Oxford, around 10 miles away.
We cover every part of the OX26 postcode area for external mastic. External mastic is available to properties on Fortescue Drive, Chestnut Close and Green Lane and the roads around them. We also cover the places around Chesterton: Wendlebury (1 mile south), Merton (2 miles south-east), Ambrosden (3 miles east), Launton (3 miles east) and Fencott (3 miles south). Within a short drive, we also cover Oxford (10 miles south), Banbury (14 miles north-west), Abingdon-on-Thames (15 miles south), Witney (15 miles south-west), Thame (13 miles south-east) and Kidlington (6 miles south-west).
What’s near Chesterton
We work in homes and buildings around The Bicester School and Red Cow pub. The nearest railway station is Bicester Village station, roughly 1.7 miles east of the centre. Well-known places in the area include Bicester Avenue (1 mile east) and Ardley Castle (3.9 miles north). The countryside around Chesterton includes Graven Hill and Woodsides Meadow.
Aftercare tips
Good habits help new joints last longer. Our tips:
- Check external joints each spring
- Fix overflowing gutters above sealed joints
- Avoid pressure-washing directly into sealant joints
- Have failed joints looked at early
Look over the joints once a year, ideally after winter. Watch for splits, edges coming away or growth in the joint.
Once a joint cannot move, the wall finds another way, often as cracks near the joint. Resealing it early helps prevent that.