Oxfordshire · England
External & façade joints in Oxford, Oxfordshire
External mastic in Oxford from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Cracked joints where brick meets render or frames
- Movement joints filled with mortar instead of sealant
- Hard, crazed mastic that has stopped moving
When it is not the sealant
In fairness, there are a few things sealant will not fix:
- Movement that’s more than a sealant joint can take
- Render that’s blown, hollow or coming away
- Rising or penetrating damp from elsewhere in the wall
If you’re not sure, just call 0345 464 0079 or drop us an email and we will give you a straight answer.
Joints and surfaces we work on
- Brickwork movement joints
- Façade panels
- Concrete & block
- Render & cladding joints
- Copings & trims
- Joints between brick and frames
External mastic in Oxford
Movement joints let brickwork, render and cladding expand and shrink without cracking. Its sealant has to flex with the building, season after season, so once it splits or hardens, the joint stops working and water gets in. If you are dealing with rain getting behind render or cladding at a joint and cracked joints where brick meets render or frames, we can put it right, on render & cladding joints, concrete & block and joints between brick and frames alike.
A place the size of Oxford has buildings of every age, from older brick terraces to modern blocks with rendered or clad walls. Newer buildings rely on sealed movement joints, while older ones need their gutters, fascias and trims kept tight.
You are covered for a year from the day we finish. If there’s a problem with it, please phone 0345 464 0079 or drop us an email.
- Where
- Oxford (OX4, OX3, OX2, OX1)
- Region
- Oxfordshire
- Cover
- A year, on every job
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
What happens on the day
The work is kept neat and contained to the area we are working on, so you can carry on as normal. Expect the work to take a few hours for a handful of joints, longer for a whole elevation, and we tell you how long to leave it before we go. Jobs in a place the size of Oxford range from town-centre flats to offices and family homes. For each, it helps to know about access, parking and where the joints are.
- Each joint is checked and the colour of the new sealant agreed.
- 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.
Before we arrive
- Mention any tricky access
- Tell us if parking is tricky
- Clear the area around the work
Get a quote
Want a quote for external mastic? Please phone 0345 464 0079 or send us an email with a few details. You will know what we plan to do, and what it will cost, before any work begins.
Related advice
Common problems we fix in Oxford
Many joints fail because they were sealed too deep or with nothing behind them. Sealant bonded to three sides has nowhere to go and tears as soon as the joint widens.
These are the problems we are asked about most:
- Weathered mastic that no longer stretches
- Damp patches traced to an open external joint
- Brick movement joints where the sealant has split
- Failed seals between different materials
For site and facilities teams at buildings such as East Oxford Primary School, larger buildings have long runs of movement joint that eventually need resealing.
Comparing quotes
- What happens if they find a problem under the old sealant
- Is the old sealant removed completely?
- Which colour the sealant will be
- How long to leave it before use
What happens if it’s left?
A failed movement joint lets water into the wall. Dealing with it early keeps the repair to the joint, instead of the wall and finishes around it. In a large rental market like Oxford, tired sealant leads to tenant complaints about mould, damp and leaks. Sorting it between tenancies is easier than dealing with it mid-let.
A failed joint rarely gets cheaper to fix by waiting. If you’re unsure, phone 0345 464 0079 or send us an email and we’ll give you an honest view and a quote.
Why us?
- Arbo and Everbuild products
- A sealant colour to suit the surroundings
- 20+ years of sealant experience
- Approved under the ARBOMaster scheme
See what affects the cost and our reviews.
Oxford buildings and the weather
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. Historic houses like Holywell Manor (about 0.8 miles north-west) are a reminder that the area around Oxford has older buildings as well as new. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth.
Letting a property close to Oxford station? Then outside joints that have cracked can let damp into a rental, so check them between lets. If you live in an older home near St Clement's Church, older walls, gutters and the joints where extensions meet them need a flexible sealant.
Oxford is in Oxfordshire. Anywhere in OX4, we can carry out external mastic at your property. Oxford is one of 443 towns and villages in Oxfordshire we cover for external mastic.
Postcode districts we cover here for external mastic: OX4, OX3, OX2 and OX1. Whether your property is on High Street, New High Street and Radcliffe Square or anywhere close by, we can help. Oxford sits on or near the A34 and A40, which makes travel easy. We also cover the places around Oxford: 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). As one of the bigger places in Oxfordshire, Oxford has homes, rented property and businesses of every kind.
Landmarks near Oxford
In Oxford, that means homes and buildings near The Star pub, Alexander Library of Ornithology and Headington Rye Oxford and the streets around them. You’ll also find Cheney School (under half a mile east) and South Park (within half a mile north-east). Oxford’s nearest station is Oxford station, roughly 1.6 miles west of the centre. Other landmarks nearby include Warneford Hospital (within half a mile east) and Rumble Museum (under half a mile east). The countryside around Oxford includes CS Lewis Nature Reserve and Headington Hill.
Should I try it myself first?
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly, so tell us about it when you ask for a quote.
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.
Your questions about external mastic in Oxford
Is there a guarantee on external mastic in Oxford?
Every job comes with our one-year guarantee, wherever it is. We’re also fully insured and ARBOMaster approved.
Can you do external mastic in Oxford?
Yes. We work across London and the South East, and Oxford is part of that. You can call 0345 464 0079 or drop us an email and tell us what needs doing.
Do you have insurance?
Yes. We are fully insured.
Can a movement joint be filled with mortar?
No. Mortar locks the joint solid, so the movement cracks the wall elsewhere. It needs a flexible sealant over backing rod.
Will it make a mess?
Not at all. We work neatly, protect the area around the joints and tidy up afterwards.
Can you work on commercial sites?
Yes. Commercial and hotel work is a large part of what we do. We can talk about working times when we quote.
How long will you be here?
As a guide, most jobs take a few hours to a few days, depending on the length of joint and the access. Bigger jobs take longer.
Can tenants book the work?
We can work for tenants, landlords or agents. Get your landlord’s agreement first.
More services for Oxford
What affects the cost of external mastic
You will get a clear quote before any work starts. It’s based on:
- The size of the job
- When we can work, for business premises
- The product the joint needs
- Access and height
There are no prices on our website, because each job is priced on what it involves. Call for a quick quote and we will talk you through it.
What to tell us for a quote
To help us quote quickly, let us know:
- Where the property is
- If it’s domestic, commercial or a hotel
- What the problem is, such as mould, gaps, leaks or cracking
- Roughly how big the job is
For external mastic in Oxford, ring 0345 464 0079 or send us an email. A short description of the job and where it is helps us quote, and you will get a clear quote before any work starts.
Landlord and commercial work in Oxford
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
Housing providers, facilities teams and property managers book us too in Oxford and across Oxfordshire. Several sites can be quoted together.