Greater London · England
Newington Green External Mastic
Professional external mastic in and around Newington Green, with old sealant always removed completely and a one-year guarantee.
- Movement joints filled with mortar instead of sealant
- Weeds or debris growing in open joints
- Leaking joints around cladding and façade panels
Your questions about external mastic in Newington Green
Do you cover Newington Green for external mastic?
Yes, Newington Green is within the area we cover. Our work covers London and the South East. Just ring 0345 464 0079 or send us an email with a few details of the job.
Is parking a problem for a job in Newington Green?
In much of London, parking needs planning: a visitor permit or a nearby bay makes the day run more smoothly.
Can you match the colour of my brickwork?
We choose a sealant colour to suit the brick, stone or render, so the joint sits quietly in the wall. There’s a wide choice of exterior colours.
What’s an expansion joint in brickwork?
Brickwork, render and cladding all move a little, and planned joints take up that movement. It’s closed with backing rod and a flexible sealant.
What is backing rod for?
The foam is closed-cell backing rod. It keeps the sealant at the right depth and bonded to the sides only so it can flex with the joint.
Will there be a smell?
That depends on the sealant. Some products have a noticeable smell, others very little.
Do I need to be at home?
It depends on the job. For work indoors, someone needs to let us in, and for outside work we will agree access with you when we book.
Is there a guarantee?
Yes. Every job comes with our one-year guarantee.
External mastic for homes and businesses in Newington Green
Low-level joints can normally be done from the ground. For joints higher up, give us some details of the building and we will confirm what access is needed. Common call-outs are for joints where the bead has come unstuck and failed sealant between panels on a façade, on render & cladding joints, joints between brick and frames and façade panels.
Newer London blocks are built with movement joints in brick and render, and with cladding joints sealed with mastic. Period houses have different weak points, such as gutter joints, trims and the line where an extension meets the old wall.
The work is guaranteed for twelve months. If there’s a problem with our work within the year, let us know and we’ll sort it.
- Where
- Newington Green (N16, N1, N5)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
DIY versus a professional finish
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
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.
Also near Newington Green
Other services in Newington Green
The process
On the day, we start by going over the job with you, so you know exactly what we’re doing. Surfaces next to the work are protected before any work begins. Most jobs take a few hours to a few days, depending on the length of joint and the access. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Newington Green. A visitor permit or a nearby bay makes the visit run more smoothly.
- 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.
- We prime the faces where required.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Before we arrive
- Plan for the work area to be out of bounds to pets and children
- Mention any leaks or damp you’ve noticed
- Where the joints are inside, avoid wetting them before we arrive
How to get a quote
To get a quote, phone 0345 464 0079 or email us and tell us where the job is and what the problem looks like. We will send you a clear quote before any work starts.
Related advice
Landlords, agents and businesses in Newington Green
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
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.
Walls and rooflines in Newington Green
In terraces and conversions, gutters and walls are often shared with the neighbours, so check who is responsible for the outside before booking. London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Newington Green is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book. If you look after a building such as Newington Green Primary School, its movement joints, gutters and trims need looking after like any other building’s. If you live in an older home near Newington Green Unitarian Church, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Newington Green is about 1 mile north of Hoxton, in Greater London. Jobs in Newington Green get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Newington Green is one of 764 towns and villages in Greater London where we work.
Every address in N16, N1 and N5 is within our area for external mastic. You will find streets such as Dove Road, Burma Road and Piano Lane. Being close to the A1199, Newington Green is simple for us to get to. If you’re just outside Newington Green, we cover Mildmay (1 mile south), Highbury (1 mile west), Canonbury (1 mile south), De Beauvoir Town (1 mile south) and Kingsland (1 mile south-east). Within a short drive, we also cover London (4 miles south), City of Westminster (4 miles south-west), Marylebone (4 miles south-west), Kensington (6 miles south-west), Walthamstow (4 miles north-east) and Whitechapel (3 miles south).
What’s near Newington Green
Typical jobs here are in homes near Stoke Newington School and Sixth Form, Highbury Fields and Army and Navy pub. Newington Green has its own railway station: Canonbury station. Well-known places in the area include Hackney Walk (1.5 miles east) and Clowns Gallery-Museum (0.7 miles south-east). Not far away are Dartmouth Park Hill and Gillespie Park.
Surface by surface
Render joints
Water behind render can lead to blown patches. Resealing the joints early keeps water out and protects the render itself.
Cladding and façade panels
Panels heat up and cool down quickly, so the joints work hard every day. The sealant is chosen with that in mind.
Aftercare tips
A little care helps the new joints last. We recommend:
- Leave the joints unpainted unless we have said otherwise
- Don’t let climbing plants root in the sealant
- Keep high-pressure jets off the joints
- Look over the joints every year, ideally after winter
Have a quick look at the joints each spring. Watch for splits, edges coming away or growth in the joint.
Leave a failed movement joint and water keeps getting into the wall. That can lead to damp patches, staining and frost damage.
When something else is needed
We will always be straight with you, so here’s what new sealant won’t do:
- Rising or penetrating damp from elsewhere in the wall
- Render that is blown, hollow or coming away
- Movement that is more than a sealant joint can take
If you are not sure, just call 0345 464 0079 or send us an email and we’ll give you a straight answer.
What we seal
- Concrete & block
- Brickwork movement joints
- Copings & trims
- Joints between brick and frames
- Façade panels
- Render & cladding joints
Why act early in Newington Green
It often makes sense to reseal all the failing joints on an elevation together. They’ve weathered the same way. In London conversions, one flat’s bathroom is often above another flat’s ceiling, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Dealing with it early is far simpler for homes in Newington Green.
Instead of a standard rate, we look at what your job involves: the amount of work, the old material and the access. The price is agreed before we begin.
Why book with us
- ARBOMaster approved applicator
- Old sealant always removed completely
- Colour agreed with you before we start
- Arbo and Everbuild products