Greater London · England
External Mastic in Mildmay
We cover Mildmay for sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly and every job guaranteed for a year.
- Joints pointed up with cement by mistake
- Plants rooting in failed movement joints
- Leaking joints around cladding and façade panels
Common problems we fix in Mildmay
Using the wrong sealant is another common reason. A stiff, general-purpose sealant cannot cope with a joint that moves a lot, and it tears off the sides.
These are the problems we are asked about most:
- Weathered mastic that no longer stretches
- Rigid filler in a joint that should flex
- Failed sealant between panels on a façade
- Joints with sealant missing in places
Schools such as Newington Green Primary School are buildings too, and larger buildings have long runs of movement joint that eventually need resealing.
Questions to ask before you book
- Whether they seal over old material or remove it
- Who does the work, and how experienced they are
- How long the guarantee is
- What the cure time is
External mastic for homes and businesses in Mildmay
Low-level joints can usually be done from the ground. For joints higher up, give us some details of the building and we’ll confirm what access is needed. Typical jobs include weeds or debris growing in open joints and water getting into walls through failed joints, across render & cladding joints, brickwork movement joints and copings & trims.
Outside work in London starts with access: side passages, upper floors and where to park. For a home in Mildmay, tell us how high the joints are and how to reach the back of the building.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we will sort it.
- Location
- Mildmay (N1, N16, E8)
- Wider area
- Greater London
- Guarantee
- 12 months on all our work
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
How to look after the new joints
How long the joints last depends on use and care. We suggest:
- Point out the joints to other trades
- Get split or bare joints resealed while the damage is small
- Leave the joints unpainted unless we have said otherwise
- Avoid pressure-washing directly into sealant joints
Only paint over the joint if we’ve confirmed the sealant can take paint. Many exterior sealants are not designed to be painted and spoil the finish.
Once a joint can’t move, the wall finds another way, often as cracks near the joint. Catch it early and you reduce the risk.
Outside joints around Mildmay
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 Sutton House (about 1.4 miles east) nearby, there’s older building stock in the area around Mildmay as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth.
In the older streets around Church of St Jude and St Paul, old and new materials meet at the roofline and walls, which is where sealant earns its keep. For landlords with property near Dalston Kingsland station, failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Mildmay is about 1 mile north of Hoxton, in Greater London. Homes, rented property, offices and hotels in Mildmay can book us for external mastic, old or new, large or small. Every job comes with our one-year guarantee. 764 places in Greater London are on our list.
Here we cover the N1, N16 and E8 postcode area for external mastic. Whether your property is on Dove Road, Essex Road and Burma Road or a nearby road, we can help. Being close to the A1199, Mildmay is easy for our applicators to reach. Other places close to Mildmay include Newington Green (1 mile north), De Beauvoir Town (1 mile south), Canonbury (1 mile south-west), Kingsland (1 mile south-east) and Highbury (1 mile west). Larger places within reach include London (3 miles south), City of Westminster (4 miles south-west), Marylebone (3 miles south-west), Kensington (6 miles south-west), Walthamstow (4 miles north-east) and Hampstead (4 miles west).
Landmarks near Mildmay
Locally, jobs take us to homes and businesses close to City of London Academy Highbury Grove, Highbury Fields and Army and Navy pub. Mildmay has its own railway station: Dalston Kingsland station. A little further out are Clowns Gallery-Museum (0.6 miles south-east) and Hackney Walk (1.5 miles east). The countryside around Mildmay includes Gillespie Park and Ludgate Hill.
Quotes for external mastic in Mildmay
Call for a quick quote. The main things that affect it are:
- The size of the job
- Whether the work is at height
- Any working-time requirements on site
- The product the joint needs
The cost depends on the amount of work, how hard the old material is to remove and how easy the joints are to reach. You’ll have a clear quote before any work starts.
Helping us quote
Photos by email are helpful but not essential. Try to tell us:
- A few pictures by email, if you can
- Whether it has been sealed before
- Whether it’s a home or a business
- Access, such as stairs, a lift or height
Asking for a quote is easy: let us know what needs doing and where, and roughly how big it is. Photos by email help us understand the job.
How the visit works
Most of a good job is in the preparation, and we do not rush it. Every joint is cleaned and dried before new material goes in. In total, it normally takes a few hours to a few days, depending on the length of joint and the access. In a London area like Mildmay, 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.
- First, the joints are inspected and the access agreed.
- We cut out the old mastic and rake out anything in the joint.
- The faces are brushed clean and primed where the product requires it.
- We fit closed-cell backing rod to control the depth.
- We apply the sealant, tool it and check the whole run.
Before we arrive
- Tell us about access, such as stairs, a lift or high-level joints
- Mention any leaks or damp you’ve noticed
- Keep pets and children clear of the area while we work
Ask for a quote
For external mastic in Mildmay, phone 0345 464 0079 or drop us an email. Tell us what the problem is and where, and we will agree the price before any work begins.
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Questions from Mildmay
Can you do external mastic in Mildmay?
Yes. We work across London and the South East, and Mildmay is part of that. You can call 0345 464 0079 or send us an email and tell us what needs doing, and we’ll give you a clear price.
Is parking a problem for a job in Mildmay?
Parking in Mildmay, 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 I add another job to the visit?
Yes. Just list everything you need and we’ll quote it together.
What information do you need?
The location, the problem and the rough size of the job. If you can, email a few photos.
What do you put in the joint?
Quality sealants from brands including Arbo and Everbuild, chosen to suit the joint. We will tell you what we’re using and why.
Should I try DIY first?
Sometimes. The key is preparation: remove all the old material and work on a clean, dry joint. If it does not work out, we can redo it.
Do you work for letting agents?
Yes. As well as homeowners, we work for landlords, agents, businesses and hotels across Greater London.
How long does external mastic last?
It varies with how exposed the wall is and how much the joint moves. Signs to watch for are cracking, hardening and gaps at the edges and have them redone then.
Leave it or put it right?
Pointing a movement joint with mortar might seem a neat fix, but it stops the joint moving. The wall then cracks somewhere else. The correct repair is a flexible sealant with the right backing. Damp from a failed joint spreads quietly in older London brickwork and timber, and by the time it shows on a wall or ceiling in Mildmay, the repair is bigger than the sealant job would have been.
Rather than a set price list, we price the job in front of us: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
What you get with us
- Over 20 years’ experience
- Rated 4.9 stars on Google
- You choose the colour before work begins
- Arbo and Everbuild products
Take a look at what affects the cost or customer reviews.
Nearby places to Mildmay
More services for Mildmay
Landlords, agents and businesses in Mildmay
Whether it’s one flat or a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
Landlords and letting agents in Mildmay can book us as well as householders. Sealant work between tenants is a simple way to keep a property in good order.
How the job changes by surface
Brickwork movement joints
Brick moves with heat and moisture, and grows a little over time. That movement goes into the joint, so the sealant in it must stay soft and stretchy.
Concrete and blockwork
Concrete faces can be dusty and porous, so cleaning and priming matter. A primer goes on where the product requires one.