Oxfordshire · England
Headington External Mastic
Sealing brickwork movement joints, render, cladding and façade joints in Headington, with a one-year guarantee on every job. Call for a quick quote.
- Movement joints filled with mortar instead of sealant
- Weathered mastic that no longer stretches
- Moss and dirt in joints with no sealant left
Why act early in Headington
Running new sealant over the old bead rarely lasts. The new layer can’t bond properly to old, weathered material, so the old joint is cut out fully first. In an older home around Headington, damp from a failed joint can get into timber and plaster, and that is a much bigger job than renewing the sealant.
Some things make a job bigger or smaller: the old material and how easily it comes out, whether mould needs treating, and whether the work is at height. Your quote takes all of that into account.
Why us?
- Full insurance on every job
- Colour agreed with you before any work starts
- Experience in homes, commercial sites and hotels
- Trusted Arbo and Everbuild sealants
See our cost guide or customer reviews.
External mastic in Headington, done properly
External mastic is a job where short cuts show quickly. Overfilled joints, missing backing rod and sealant laid over old sealant all tend to fail early. We take the old material out and do it properly. We work on render & cladding joints, façade panels and concrete & block, and common reasons people get in touch are weathered mastic that no longer stretches and water getting into walls through failed joints.
Homes around Headington range from older cottages to newer houses, with walls and rooflines of every type. Older gutters and trims need their joints resealed; newer brick and render need their movement joints kept sound.
You get a one-year guarantee, the same in Headington as everywhere else we work.
- Location
- Headington (OX3)
- Wider area
- Oxfordshire
- Guarantee
- One year on every job
- Quote
- A clear price before we start
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Also near Headington
More services for Headington
How it works
There is not much for you to do on the day. Show us the job and we’ll take it from there. The work itself takes a few hours to a few days, depending on the length of joint and the access from start to finish. For a job in Headington, we agree the time, the access and parking before the day. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- The old mastic and anything lodged in the joint is removed.
- We clean both faces of the joint and prime them where the product calls for it.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
How to prepare
- Keep pets and children clear of the area while we work
- On commercial sites, let us know about site rules
- Mention any parking rules near the property
Get a quote
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we will talk you through what we’d do. When it suits you, phone 0345 464 0079 or email us.
Read more
What affects the quote in Headington
You will get a clear quote before any work starts. It’s based on:
- Working hours on commercial sites
- The size of the job
- Whether old sealant or filler has to be cut out
- Access and height
What you pay reflects the work, not guesswork. That’s why we ask about the job first and agree the price before starting.
Asking for a quote
Photos help, but a description is a good start. Try to tell us:
- The problem you’ve noticed
- Where the job is, and your postcode
- Whether it has been sealed before
- Roughly how big the job is
Call for a quick quote, or email us if that’s easier. Tell us about the joints that need doing and we will talk you through the work before giving you a price.
Surface by surface
Render joints
Cracks along render joints let water in behind the coat. Resealing the joints early keeps water out.
Brickwork movement joints
People sometimes point up a brick movement joint by mistake. Where one has been mortared, we cut it out and reseal it with sealant if the joint can be cleared.
Landlords, agents and businesses in Headington
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements.
Landlords and agents in Headington can book us as well as homeowners. Resealing between tenancies is a simple way to keep a property in good order.
Common questions in Headington
Is Headington within the area you cover?
Yes. Headington is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Can you help a landlord with a rental near Oxford station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. You can ring 0345 464 0079 or drop us an email with the details for a clear quote.
What information do you need?
The location, the problem and the rough size of the job. If you can, email a few pictures.
Are you an approved applicator?
Yes. We’re approved under the ARBOMaster scheme.
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.
Should I try DIY first?
Some simple jobs can be done by a careful DIYer. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
Can you match the colour of my brickwork?
There’s a good range of exterior colours, including greys, browns, whites and stone tones. We choose the closest to your brick or render so it does not stand out.
What is a movement joint?
Walls move with heat, cold and moisture, so long walls have planned gaps to take that movement. The gap is sealed with a flexible sealant over backing rod.
What external mastic looks like in Headington
Historic houses like Holywell Manor (about 1.6 miles west) are a reminder that the area around Headington has older buildings as well as new. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material. The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Rented homes near Oxford station change hands often, and 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 Andrew's Church, older walls, gutters and the joints where extensions meet them need a flexible sealant.
Headington is about 1 mile north-east of Oxford, in Oxfordshire. We carry out external mastic for householders, landlords and businesses in Headington, as part of our work across Oxfordshire. Our Oxfordshire coverage runs to 443 places, Headington among them.
Here we cover the OX3 postcode area for external mastic. You will find streets such as Upway Road, Osler Road and Beech Road, and we cover them all. We also cover Northway (1 mile north-west), Headington Quarry (1 mile south-east), Headington Hill (1 mile south-west), New Marston (1 mile west) and Oxford (1 mile south-west). Within a short drive, we also cover Didcot (11 miles south), Bicester (10 miles north), Abingdon-on-Thames (7 miles south-west), Witney (12 miles west), Thame (10 miles east) and Wantage (15 miles south-west).
Landmarks near Headington
Around Headington, our work takes us to homes and buildings near White Hart Inn, Bury Knowle Park and Cheney School. You’ll also find Headington Rye Oxford (0.7 miles south-west), English Faculty Library (1.6 miles west) and Holy Trinity Church (0.8 miles south-east). The closest station to Headington is Oxford station, about 2.6 miles west of the centre. A little further out are Rumble Museum (0.9 miles south-west) and Churchill Hospital (less than half a mile west). Green spaces nearby include CS Lewis Nature Reserve and Headington Hill.
Looking after it afterwards
How long the joints last depends on use and care. We suggest:
- Check external joints each spring
- Do not let climbing plants root in the sealant
- Have failed joints looked at early
- Avoid pressure-washing directly into sealant joints
If you have more work done on the wall, such as new render, cladding or an opening, show the contractor the movement joints. They should be kept open and resealed, not filled.
Leave a failed movement joint and water keeps getting into the wall. Over time it can mean damp inside, stained render or frost-damaged brick, all bigger jobs than a reseal.
When to call us in Headington
If plants are growing out of a joint, the sealant has usually failed or was never there. Roots and dirt hold water against the wall and speed up the damage.
Look out for any of the following:
- Rigid filler in a joint that should flex
- Cracked joints where brick meets render or frames
- Weathered mastic that no longer stretches
- Joints where the bead has come unstuck
For site and facilities teams at buildings such as St Andrew's Church of England Primary School, its movement joints, gutters and trims need looking after like any other building’s.
Before you book anyone
- How the colour is chosen
- Who does the work, and how experienced they are
- What the quote includes, VAT included or not
- What guarantee comes with the work