Greater London · England
External & façade joints in North End, Greater London
Sealing brickwork movement joints, render, cladding and façade joints in North End, with a 12-month guarantee on every job. Call for a quick quote.
- Brick movement joints where the sealant has split
- Weathered mastic that no longer stretches
- Failed sealant between panels on a façade
External mastic for homes and businesses in North End
Failed sealant is cut out, the depth set with closed-cell backing rod, and the joint resealed with a low-modulus sealant made for outside. We pick a colour that sits well with the wall so the line blends in. We work on copings & trims, brickwork movement joints and joints between brick and frames, and the jobs we see most are rain getting behind render or cladding at a joint and sealant that has lost its bond to the brick or render.
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
- North End (DA8, DA1, DA7)
- Region
- Greater London
- Guarantee
- A year, on every job
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
DIY versus a professional finish
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it lifts and traps water and mould underneath. Everything old must be removed first.
If you’ve already had a go yourself, that is fine. We cut it out and start again.
What we’re called out for in North End
Using the wrong sealant is another common reason. A stiff, general-purpose sealant cannot cope with a joint that moves a lot, so it pulls away from the edges.
Any of these means the joints need attention:
- Cracked joints where brick meets render or frames
- Movement joints with cracked, split or missing sealant
- Damp patches traced to an open external joint
- Movement joints filled with mortar instead of sealant
North End is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
What your quote should include
- What happens if they find a problem under the old sealant
- Is VAT in the price?
- Is the old sealant removed completely?
- What product goes in the joint
Outside joints around North End
Historic houses like Hall Place and Gardens (about 2 miles south-west) are a reminder that the area around North End has older buildings as well as new. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth. In terraces and conversions, gutters and walls are often shared with the neighbours, so it’s worth agreeing who is responsible before work starts.
If you look after a building such as St. Paul's (Slade Green) Church of England Primary School, larger buildings have long runs of movement joint that eventually need resealing. Rented homes near Slade Green station change hands often, and outside joints that have cracked can let damp into a rental, so check them between lets.
North End is about 2 miles north-west of Dartford, in Greater London. Anywhere in DA8, we cover external mastic for homes and businesses. Our Greater London coverage runs to 764 places, and North End is one of them. London is on our list too, around 13 miles away.
Postcode districts we cover here for external mastic: DA8, DA1 and DA7. You’ll find streets such as Oak Road, Elm Road and Moat Lane, all of which we cover. Close by, we work in Slade Green (1 mile east), Barnes Cray (1 mile south), Bexley Riverside (1 mile west), Barnehurst (1 mile west) and Northumberland Heath (1 mile west). Larger places within reach include London (13 miles west), City of Westminster (15 miles west), Marylebone (15 miles west), St Pancras (14 miles west), Shoreditch (12 miles west) and Walthamstow (13 miles north-west).
What’s near North End
In North End, that means homes and buildings near Railway Tavern, Braeburn Park and Haberdashers' Aske's Crayford Academy and the streets around them. North End has its own railway station: Slade Green station. Well-known places in the area include Erith Museum (1.2 miles north-west) and Erith and District Hospital (1.4 miles north-west). Green spaces nearby include Wansunt Pit.
What affects the cost of external mastic
We quote each job individually. These are the things that affect it:
- Working hours on commercial sites
- Which sealant suits the joint
- The old material and how stubborn it is
- Whether there’s mould to deal with
What it costs depends on the amount of work, how hard the old material is to remove and access to the work. You will have a clear quote before any work starts, so you know where you stand.
What we need to know
To help us quote quickly, please include:
- Whether it has been sealed before
- Roughly how big the job is
- What the problem is, such as mould, gaps, leaks or cracking
- Pictures of the joints, sent by email
Need a quote? Please call 0345 464 0079 or send us an email and tell us about the job. You will know what we plan to do, and what it will cost, before any work begins.
Why it’s worth doing now in North End
Mortar or ordinary filler might look like a quick way to close an open joint, but it locks the joint solid. The wall then cracks somewhere else. The correct repair is a flexible sealant with the right backing. In a flat in North End, 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.
Commercial jobs are quoted on the same basis as homes: the amount of work, how we reach it and what it needs. Ask us for a quote and we will explain what it covers.
Why North End clients choose us
- Sealant colour chosen to suit
- We leave the area clean and tidy
- Rated 4.9 stars on Google
- We agree the colour with you first
Take a look at what affects the cost or customer reviews.
Landlord and commercial work in North End
We also work for property managers and facilities teams in North End and across Greater London. Several sites can go on one quote, and we’re fully insured for the work.
For anyone letting property in or around North End, several properties can go on one quote. Send us the addresses and the work at each.
When it isn’t the sealant
In fairness, some problems need a different trade:
- Walls that need new movement joints cut into them
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Cracks in the bricks or render themselves, away from the joints
If you are not sure, just ring 0345 464 0079 or email us and we’ll give you a straight answer.
Surfaces we seal
- Copings & trims
- Render & cladding joints
- Joints between brick and frames
- Façade panels
- Brickwork movement joints
- Concrete & block
Questions from North End
Can you do external mastic in North End?
Yes, North End is within the area we cover. We work across London and the South East. Just ring 0345 464 0079 or email us with a few details of the job.
Is parking a problem for a job in North End?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot.
I’m a tenant. Can you help?
Yes, though it’s best to check with your landlord first. Many landlords are glad to have it sorted.
Is it worth trying it myself?
It depends on the job. High-level, external movement and fire-rated joints are professional jobs.
Is it OK to seal over old sealant?
No, and we never do. It can look neat for a few weeks, but the new layer lifts away from the old one. The old sealant has to come out completely.
Can landlords and businesses book you?
Yes, often. We can quote for several properties at once, and between tenancies is a good time for the work.
How long will you be here?
Most jobs take a few hours for a handful of joints, longer for a whole elevation. We’ll confirm how long when we quote.
What colours does the sealant come in?
We choose a sealant colour to suit the brick, stone or render. Exterior sealants come in a good range of colours.
Towns and villages near North End
Other services in North End
How it works
Most of a good job is in the preparation, so that is where we spend the time. Joints are cleaned back and dried before anything new goes in. In total, it usually takes anything from a few hours to several days, depending on the building. In North End, flats, stairs and shared entrances are part of the routine. Mention any building rules, key holders or managing agents when you book.
- First we look over the joints with you, agree which to renew and talk through access.
- The old mastic and anything lodged in the joint is removed.
- We clean both faces of the joint and prime them where the product calls for it.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
Preparing for the visit
- Tell us if parking is tricky
- Clear items away from the joints we’re working on
- Where the joints are inside, avoid wetting them before we arrive
Getting a quote
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is. When it suits you, phone 0345 464 0079 or drop us an email.