Oxfordshire · England
North Oxford External Mastic
External mastic for North Oxford, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Water getting into walls through failed joints
- Weeds or debris growing in open joints
- Leaking joints around cladding and façade panels
What happens on the day
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 several days, depending on the building. A visit to North Oxford is planned like any other: the time, the access and where to park are agreed in advance. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- We start by checking each joint, agreeing the ones to redo and how we’ll reach them.
- Old sealant and any debris are cut and raked out.
- Both sides are cleaned back to sound material and primed if needed.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Before we arrive
- Tell us about any water getting in
- Mention any sign-in or site rules at work premises
- Keep pets and children clear of the area while we work
How to get a quote
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is. Whenever you’re ready, ring 0345 464 0079 or email us.
Read more
About our external mastic in North Oxford
Joints in render and cladding are easy to overlook until a damp patch appears. We inspect them, agree which need doing and reseal with a weatherproof, flexible sealant in a colour to suit. We work on concrete & block, copings & trims and brickwork movement joints, and people most often call us about rigid filler in a joint that should flex and damp patches traced to an open external joint.
Outbuildings, garages and conservatories around homes in places like North Oxford add more joints to look after. Gutter ends, garage door frames and the joints where an extension meets the house are typical spots for leaks.
All our work is covered by a 12-month guarantee, wherever you are in Oxfordshire.
- Where
- North Oxford (OX2)
- Region
- Oxfordshire
- Guarantee
- A year, on every job
- Price
- A clear price before work begins
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Common questions in North Oxford
I let a flat near Oxford station. Can you help?
Yes, we work for letting agents and landlords. Just ring 0345 464 0079 or send us an email and tell us about the property, and we will send you a clear quote.
Is North Oxford in your area for external mastic?
Yes, North Oxford is within the area we cover. Our work covers London and the South East. Just call 0345 464 0079 or drop us an email with a few details of the job, and we will send you a clear quote.
How often do external joints need resealing?
There’s no fixed answer: sunny, exposed elevations and busy joints wear faster. Check them each year and reseal when they split or harden. Our work comes with a 12-month guarantee.
Can you reach joints on upper floors?
It depends on the height and the site. Low-level joints are straightforward; for higher work, tell us about the building and we’ll confirm what’s needed.
What do you put in the joint?
We choose the sealant for the joint, not the other way round. Where it moves, gets wet or faces the weather makes a difference.
Will the new joint stand out?
We choose a sealant colour to suit the brick, stone or render, so the joint sits quietly in the wall. Exterior sealants come in a good range of colours.
Do I need to be at home?
If the work is inside, we need someone to let us in. After that, you can carry on with your day.
Where do you work from?
We are a Crawley-based firm, with over 20 years’ experience. We work across South East England, London and Scotland.
Honest limits
In fairness, there are a few things sealant won’t fix:
- Damp that isn’t coming from the joint
- Loose or hollow render, which needs re-rendering
- Structural movement, which needs a surveyor or engineer
If in doubt, phone 0345 464 0079 or send us an email and we’ll say what we think.
Joints and surfaces we work on
- Render & cladding joints
- Concrete & block
- Façade panels
- Brickwork movement joints
- Joints between brick and frames
- Copings & trims
Walls and rooflines in North Oxford
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 Holywell Manor (about 1.5 miles south-east) nearby, there’s older building stock in the area around North Oxford as well as newer homes. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth.
Homes close to Church of St Michael and All Angels include some older properties, and the joints between older walls, newer extensions and the roofline need a sealant that can move. Managing a site like Oxford Academy? Then movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
North Oxford is about 2 miles north-west of Oxford, in Oxfordshire. Wherever you are in the OX2 postcode area, we cover external mastic for homes and businesses. We cover 443 towns and villages across Oxfordshire, from the larger towns to small villages.
We cover every part of the OX2 postcode area for external mastic. Streets in the area include Hobson Road, Linton Road and Banbury Road, and we cover them all. North Oxford sits on or near the A4165, so getting to you is simple. Nearby, we also carry out external mastic in Summertown (1 mile north), Park Town (1 mile south), Walton Manor (1 mile south), Norham Manor (1 mile south-east) and Sunnymead (1 mile north). Further out, we also cover Didcot (11 miles south), Bicester (10 miles north-east), Abingdon-on-Thames (7 miles south), Witney (10 miles west), Carterton (14 miles west) and Thame (13 miles east).
Around North Oxford
Around North Oxford, our work takes us to homes and buildings near St Aloysius' Catholic Primary School, Oxford University Parks and St Edward's School and the streets around them. Nearby too are St Hugh's College Main Building Including Library (0.5 miles south) and Dew Drop Inn (less than half a mile north). North Oxford’s nearest station is Oxford station, about 1.4 miles south. Other landmarks nearby include Oxford University Press Museum (1.1 miles south) and Oxford Castle (1.5 miles south). Open spaces near North Oxford include Hook Meadow and The Trap Grounds and Headington Hill.
Also near North Oxford
Other services in North Oxford
What we are called out for in North Oxford
If plants are growing out of a joint, the sealant has generally failed or was never there. Dirt and roots then trap moisture in the joint and make things worse.
If you can see any of these, it’s time to have the joints looked at:
- Cracked joints where brick meets render or frames
- Plants rooting in failed movement joints
- Joints where the bead has come unstuck
- Movement joints filled with mortar instead of sealant
Letting a property close to Oxford station? Then failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Comparing quotes
- How much experience the applicator has
- Whether they seal over old material or remove it
- Whether you can choose the colour
- What product goes in the joint
Work for landlords, hotels and businesses
For anyone letting property in or around North Oxford, several properties can be quoted together. Just tell us the addresses and what each one needs, and photos by email help.
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
DIY sealant or a professional job?
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
The biggest DIY mistake is sealing over old sealant. New silicone won’t bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
How we quote for external mastic
We quote each job individually. This is what makes a difference:
- The size of the job
- Any working-time requirements on site
- Which sealant suits the joint
- Whether the work is at height
Leaving a failed joint generally makes the job bigger, not smaller, as water and mould keep getting in. If you are not sure whether it needs doing, call 0345 464 0079 or email us and we’ll give you an honest view and a quote.
Asking for a quote
Photos by email are helpful but not essential. Please mention:
- Where the property is
- Pictures of the joints, sent by email
- The problem you’ve noticed
- If someone has resealed it before
Need a quote? Please phone 0345 464 0079 or drop us an email with a few details. You will know what we plan to do, and what it will cost, before any work begins.
Why deal with it now?
An open joint keeps letting water into the wall with every downpour. Wet masonry is more easily damaged by frost near the open joint, so the damage spreads beyond the joint. Homes in smaller places like North Oxford can face more weather, and failed outside joints let damp into walls. Indoors, a failed seal lets water into floors and panels as it would anywhere.
We do not show prices on the website, because the cost depends so much on the job itself. For a quick quote, please ring 0345 464 0079 or drop us an email.
Why North Oxford clients choose us
- We leave the area clean and tidy
- Domestic, commercial and hotel work
- Old sealant always removed completely
- Anti-fungal silicone where joints get wet
Take a look at what affects the cost or what customers say.