Greater London · England
West Hackney External Mastic
External mastic for West Hackney and the surrounding area: careful preparation, the right product and tidy work. Call for a quick quote.
- Sealant pulling away from one side of the joint
- Failed sealant between panels on a façade
- Rigid filler in a joint that should flex
DIY versus a professional finish
If you’re set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it doesn’t work out, we can still put it right.
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it lifts and traps water and mould underneath. All the old material has to come out first.
External mastic in West Hackney, done properly
As ARBOMaster approved applicators, we choose exterior sealants to suit the joint and the surfaces. Some surfaces need a primer before sealing. If you’re dealing with weeds or debris growing in open joints and weathered mastic that no longer stretches, we can put it right.
Newer London blocks are built with movement joints in brick and render, and with cladding joints sealed with mastic. Older terraces have their own weak points: gutter joints, roofline trims and the joint where an extension meets the original wall, and both kinds of building are found across London.
Each job carries a 12-month guarantee.
- Location
- West Hackney (N16, E5, E8)
- Region
- Greater London
- Cover
- A year, on every job
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Do you need external mastic in West Hackney?
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.
Most people get in touch when they notice one of these:
- Weathered mastic that no longer stretches
- Failed sealant between panels on a façade
- Sealant that has lost its bond to the brick or render
- Movement joints with cracked, split or missing sealant
For site and facilities teams at buildings such as Benthal Primary School, larger buildings have long runs of movement joint that eventually need resealing.
Before you book anyone
- Whether they seal over old material or remove it
- What preparation is included
- Is VAT in the price?
- What guarantee comes with the work
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 flat in West Hackney, failed sealant seldom stays inside your own four walls: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
Combining jobs into one visit is generally more efficient than separate visits, so tell us about everything that needs sealing. We will send you a clear quote for the lot.
Why West Hackney clients choose us
- Over 20 years’ experience
- Homes, businesses and hotels
- An ARBOMaster approved applicator
- Any old sealant cut out fully, not covered over
How it works
Every visit runs the same way: we check the joints, mask and protect the surrounding surfaces, do the work and clear up. It usually takes a few hours to a few days, depending on the length of joint and the access. For a job in West Hackney, parking and access are the things to plan: let us know about parking, the floor we will be working on and any lift or shared entrance.
- 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.
Before we arrive
- Let us know if you’ve seen damp or leaks
- Let us know about parking restrictions
- Tell us about access, such as stairs, a lift or high-level joints
Getting a quote
For external mastic in West Hackney, ring 0345 464 0079 or send us an email. A short description of the job and where it is helps us quote, and we will agree the price before any work begins.
Read more
How we quote for external mastic
Some jobs are bigger than they look, and some smaller. The main factors:
- How many areas need sealing
- How easy the joints are to reach
- How much old sealant there is and how hard it is to remove
- The product the joint needs
Instead of a standard rate, we price the job in front of us: how many joints, what’s in them now and how we reach them. You’ll know the price before we begin.
What we need to know
When you contact us, these details help:
- Pictures of the joints, sent by email
- Where the property is
- Access, such as stairs, a lift or height
- How many joints, rooms or windows are involved
For a quote, call 0345 464 0079 or email us and tell us where the job is and what the problem looks like. You’ll have a clear quote before work begins.
What we can’t put right
It helps to know what we cannot do too:
- Cracking across the wall rather than at a joint
- Render that’s blown, hollow or coming away
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
If in doubt, phone 0345 464 0079 or drop us an email and we’ll say what we think before booking.
What we seal
- Brickwork movement joints
- Concrete & block
- Joints between brick and frames
- Façade panels
- Render & cladding joints
- Copings & trims
West Hackney questions
Is parking a problem for a job in West Hackney?
Parking in West Hackney, as in most of London, takes a little planning: a visitor permit or a nearby bay makes the day run more smoothly, so mention what’s available when you book.
Can you do external mastic in West Hackney?
Yes. We work across London and the South East, and West Hackney is part of that. Just call 0345 464 0079 or drop us an email with a few details of the job, and we’ll send you a clear quote.
What information do you need?
A short description and the location. If we need more, we’ll ask.
Can you seal over the old sealant?
No, because it fails. The old sealant always comes out first, so the new sealant bonds properly.
Is there any odour?
That depends on the sealant. Some products have a noticeable smell, others very little, and any smell fades as they cure.
What does external mastic cost?
We do not publish prices, because the cost depends on the job: how much there is, what’s there now, how we reach it and what it needs. We agree the price before any work begins.
Do you have insurance?
Yes. Mr Mastic is fully insured, with over 20 years’ experience in sealant work.
Should I try DIY first?
It depends on the job. High-level, external movement and fire-rated joints are professional jobs, while a short indoor joint may be within reach.
Walls and rooflines in West Hackney
Historic houses like Sutton House (about 1.2 miles south-east) are a reminder that the area around West Hackney 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. The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For landlords with property near Rectory Road station, 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 Michael and All Angels, older walls, gutters and the joints where extensions meet them need a flexible sealant.
West Hackney is about 4 miles north of London, in Greater London. If you need external mastic in West Hackney, it’s easy to get a quote: please ring 0345 464 0079 or send us an email. We cover Greater London from our Crawley base. 764 places in Greater London are on our list.
We cover every part of N16, E5 and E8 for external mastic and the streets around it. Local streets include Muir Road, Burma Road and Piano Lane, all of which we cover. Being close to the A107, West Hackney is easy for our applicators to reach. Other places close to West Hackney include Shacklewell (1 mile south), Stoke Newington (1 mile west), Clapton (1 mile east), Stamford Hill (1 mile north) and Upper Clapton (1 mile north-east). Within a short drive, we also cover London (4 miles south), City of Westminster (5 miles south-west), Marylebone (4 miles south-west), Kensington (7 miles south-west), St Pancras (3 miles south-west) and Walthamstow (3 miles north-east).
Near you in West Hackney
Locally, jobs take us to homes and businesses close to The Coach And Horses Public House, Tawhid Boys School and Stoke Newington Common. You will also find Church of St Andrew (0.8 miles north-west) and The Petchey Academy (0.5 miles south). West Hackney has its own railway station: Rectory Road station. Other landmarks nearby include Montfichet's Tower (3.5 miles south-west) and Clowns Gallery-Museum (1.1 miles south). Green spaces nearby include Woodberry Wetlands and Hollow Pond.
Work for landlords, hotels and businesses
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance.
Failed sealant is one of the commonest items on a check-out report, and it’s easy to sort out between tenants. We can quote for more than one property at once.