Greater London · England
External Mastic in Brunswick Park
Professional external mastic in and around Brunswick Park, with old sealant always removed completely and a 12-month guarantee.
- Cracked joints where brick meets render or frames
- Moss and dirt in joints with no sealant left
- Joints where the bead has come unstuck
External mastic for homes and businesses in Brunswick Park
Ground-floor and low-level joints are straightforward to reach. Where joints are higher up, tell us about the building when you get in touch and we’ll confirm what’s needed to reach them safely. We work on render & cladding joints, copings & trims and brickwork movement joints, and common reasons people get in touch are water getting into walls through failed joints and plants rooting in failed movement joints.
Modern London flats rely on sealed movement joints and cladding joints. Older terraces have their own weak points: gutter joints, roofline trims and the joint where an extension meets the original wall.
We guarantee the work for a year. If something isn’t right with it in that time, tell us and we will put it right.
- Location
- Brunswick Park (N11, N20, N14)
- Wider area
- Greater London
- Cover
- A year, on every job
- Price
- A clear price before work begins
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Brunswick Park: your questions answered
Is Brunswick Park in your area for external mastic?
Yes. We work across London and the South East, and Brunswick Park is part of that. You can phone 0345 464 0079 or send us an email and tell us what needs doing, and we’ll send you a clear quote.
Can parking be tricky for a visit in Brunswick Park?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot.
Will there be a smell?
Possibly a little. It fades as the sealant cures.
What do you put in the joint?
We choose the sealant for the joint, not the other way round. Movement, water and weather all affect the choice.
What colours does the sealant come in?
Exterior sealants are made in a range of colours, from greys and browns to whites and stone shades. We pick the one that suits your wall best so it does not stand out.
When is the sealant fully cured?
Most sealants are touch-dry well before they’re fully cured. We’ll give you the cure time for the product we used.
Do you work for landlords and businesses?
Yes, regularly. We can quote for several properties at once.
Do you take out the old sealant first?
Always. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.
For landlords and businesses
Housing providers, facilities teams and property managers book us too. We can quote a run of properties together.
Whether it’s one flat or a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a one-year guarantee.
When it is not the sealant
Sealant is not the answer to every problem, and we’d rather say so up front. It will not solve:
- Loose or hollow render, which needs re-rendering
- Rising or penetrating damp from elsewhere in the wall
- Walls that need new movement joints cut into them
Not sure which it is? You can phone 0345 464 0079 or email us and we’ll tell you honestly before booking.
What we seal
- Brickwork movement joints
- Render & cladding joints
- Copings & trims
- Concrete & block
- Façade panels
- Joints between brick and frames
What affects the cost of external mastic
Call for a quick quote. What matters most is:
- Which sealant suits the joint
- Whether there’s mould to deal with
- Access and height
- Any working-time requirements on site
The cost depends on the size of the job, how much old material has to come out and how easy the joints are to reach. We give a clear quote before any work starts, so you know where you stand.
Asking for a quote
To help us quote quickly, please include:
- Where the property is
- What’s wrong with the joints now
- Roughly how big the job is
- Whether it has been sealed before
Every job is quoted individually, so start by telling us what you need. Just phone 0345 464 0079 or email us with the details.
Keeping the joints in good condition
Once the sealant has cured, a few habits help it last:
- Show decorators and builders where the movement joints are
- Have failed joints looked at early
- Check external joints each spring
- Keep high-pressure jets off the joints
Avoid pressure-washing straight into the joints. High-pressure water can lift the edges.
Act while the splits are small. At that stage it’s a simple cut out and reseal.
Walls and rooflines in Brunswick Park
In terraces and conversions, gutters and walls are often shared with the neighbours, so it’s worth agreeing who is responsible before work starts. With historic houses such as Bruce Castle (about 3.6 miles south-east) nearby, there’s older building stock in the area around Brunswick Park 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.
In the older streets around Oakleigh Community Church, an extension built onto an older house moves differently, and the joint between them takes the strain. Managing a site like St Andrew the Apostle Greek Orthodox School? Then larger buildings have long runs of movement joint that eventually need resealing. As a London address, Brunswick Park can be tricky for parking: let us know about parking bays, permits or a driveway.
Brunswick Park is about 2 miles south-east of Barnet, in Greater London. Brunswick Park gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a 12-month guarantee. Our Greater London coverage runs to 764 places, Brunswick Park among them. Our London page covers work nearby.
Here we cover the N11, N20 and N14 postcode area for external mastic. Streets in the area include Dene Road, Link Road and Pine Road. If you are just outside Brunswick Park, we cover Osidge (1 mile north-east), Southgate (1 mile east), East Barnet (1 mile north-west), New Southgate (1 mile south) and Friern Barnet (1 mile south). Larger places within reach include London (9 miles south), City of Westminster (8 miles south), Marylebone (7 miles south), Kensington (9 miles south), St Pancras (7 miles south) and Shoreditch (8 miles south-east).
Landmarks near Brunswick Park
Locally, jobs take us to homes and businesses close to Salcombe School, Friary Park and Brunswick Park Primary and Nursery School, among other places. You will also find Francis Skaryna Belarusian Library and Museum (1.7 miles south-west) and The Osidge Arms (0.5 miles north-east). Brunswick Park’s nearest station is New Southgate station, roughly 0.9 miles south of the centre. Well-known places in the area include Coppetts Wood Hospital (1.7 miles south) and Broomfield House Museum (1.5 miles south-east). For a walk, there’s Barfield Allotments Nature Park and Darland's Lake.
The process
There’s no need to move everything out, only the area right around the joints. Everything nearby is protected, and the work takes a few hours for a handful of joints, longer for a whole elevation in most cases. In a London area like Brunswick Park, the main things to plan are parking and access: tell us about permits, visitor bays or off-street space, which floor we are working on and whether there’s a lift.
- We look at every joint and agree a colour to suit the wall.
- Failed sealant is removed back to clean, sound faces.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- Primer is applied wherever the sealant needs it.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
How to prepare
- Tell us about access, such as stairs, a lift or high-level joints
- Clear items away from the joints we’re working on
- Keep children and pets away from the work area
Getting a quote
There’s no standard price list, as no two jobs are quite the same. Instead, we give you a clear quote for your job. To get started, phone 0345 464 0079 or drop us an email.
Read more
Why it’s worth doing now in Brunswick Park
A properly done movement joint is an even line in a colour that suits the wall. A hurried job with smeared edges and no backing looks worse and fails sooner, so it pays to do it properly once. In London conversions, one flat’s bathroom is often above another flat’s ceiling, and a slow leak from a failed seal can end up in the flat below. Putting it right early is much less trouble.
No two jobs are quite the same, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all play a part.
Why Brunswick Park customers choose us
- Rated 4.9 stars on Google
- We leave the area clean and tidy
- We agree the colour with you first
- An ARBOMaster approved applicator
Take a look at what affects the cost or customer reviews.
Towns and villages near Brunswick Park
What else we do in Brunswick Park
DIY versus a professional finish
If you’re set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it doesn’t work out, we can still put it right.
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.