Greater London · England
External & façade joints in Stroud Green, Greater London
Sealing brickwork movement joints, render, cladding and façade joints in Stroud Green, with a 12-month guarantee on every job. Ask us for a quote.
- Sealant pulling away from one side of the joint
- Damp patches traced to an open external joint
- Joints with sealant missing in places
Why deal with it now?
The longer a joint stays open, the more water the wall takes in. Wet masonry is more easily damaged by frost, so the problem grows beyond the joint itself. In a London flat, a failed joint rarely stays your problem alone: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
Commercial jobs are quoted on the same basis as homes: the amount of work, the access and the products needed, plus any working-time requirements on site. Call for a quick quote and we’ll go through it with you.
Why Stroud Green clients choose us
- Colour picked to suit the job
- 4.9 on Google from 180+ five-star reviews
- A 12-month guarantee on all work
- We never seal over old sealant
Read how sealant jobs are priced and customer reviews.
External mastic in Stroud Green, done properly
We cut out failed sealant, set the joint depth with closed-cell backing rod and reseal with a low-modulus exterior sealant. The colour is chosen to suit the brick or render so the line blends in. If you’re dealing with sealant that has lost its bond to the brick or render and damp patches traced to an open external joint, we can put it right, whatever the surface.
Outside work in London starts with access: side passages, upper floors and where to park. For a home in Stroud Green, tell us how high the joints are and how to reach the back of the building.
You are covered for a year from the day we finish. If there’s a problem with it, please ring 0345 464 0079 or email us.
- Place
- Stroud Green (N4, N8, N19)
- Region
- Greater London
- Cover
- 12 months on all our work
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Work for landlords, hotels and businesses
Letting agents often deal with us directly. Tell us the address, the job and how access works and we’ll give you a quote.
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
Stroud Green questions
Can you do external mastic in Stroud Green?
Yes. Our work covers London and the South East, and Stroud Green is part of that. You can ring 0345 464 0079 or send us an email and tell us what needs doing.
Can parking be tricky for a visit in Stroud Green?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. That way the visit can be planned around it.
Which products do you use?
It depends on the joint: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.
Do you work for letting agents?
Yes. We work in homes, commercial premises and hotels.
Can you match the colour of my brickwork?
We choose a sealant colour to suit the brick, stone or render. Exterior sealants come in a good range of colours.
Can I add another job to the visit?
Yes, we can. More than one area can go on one quote.
Do you do commercial work?
Yes, regularly. Larger jobs can be planned room by room or area by area.
What does external mastic cost?
Every job is different, so each one gets its own quote. For a quick quote, call 0345 464 0079 or email us with a short description of the job.
Signs you need external mastic in Stroud Green
If plants are growing out of a joint, the sealant has generally failed or was never there. Roots and dirt hold water against the wall.
Keep an eye out for these signs:
- Movement joints filled with mortar instead of sealant
- Weeds or debris growing in open joints
- Rain getting behind render or cladding at a joint
- Failed sealant between panels on a façade
As a London address, Stroud Green can be tricky for parking: let us know about parking bays, permits or a driveway.
What to look for in a quote
- When the joint can take water or movement
- How the colour is chosen
- How hidden problems are handled
- What the quote includes, VAT included or not
What sealant work cannot fix
To be straight with you, some problems need a different trade:
- Failed render or damaged cladding panels
- Cracks in the bricks or render themselves, away from the joints
- Rising or penetrating damp from elsewhere in the wall
Not sure which it is? You can phone 0345 464 0079 or drop us an email and we will tell you honestly before you book.
Where we work in Stroud Green
- Joints between brick and frames
- Façade panels
- Brickwork movement joints
- Copings & trims
- Render & cladding joints
- Concrete & block
How it works
We bring everything the job needs with us. Once we have agreed what’s being done, we protect the area and start. It normally takes a few hours to a few days, depending on the length of joint and the access. In a London area like Stroud Green, the main things to plan are parking and access: let us know about parking, the floor we will be working on and any lift or shared entrance.
- Each joint is checked and the colour of the new sealant agreed.
- We take out the old sealant until the faces are sound.
- 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
- Clear items away from the joints we’re working on
- Try not to wet indoor joints just before the visit
- Mention any tricky access
How to get a quote
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is.
Read more
Looking after it afterwards
Aftercare is simple:
- Check external joints each spring
- Tell anyone working on the walls about the movement joints
- Don’t let climbing plants root in the sealant
- Avoid pressure-washing directly into sealant joints
Keep the joints clear of soil, plants and climbing growth. Damp material against the sealant shortens its life.
If you can see gaps, plants or bare sections in a joint, have it checked. Early work is quicker and leaves a better finish.
Towns and villages near Stroud Green
More services for Stroud Green
External mastic in Stroud Green: local notes
London terraces and converted houses often share gutters, downpipes and walls, so check who is responsible for the outside before booking. The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Schools such as St Aidan's Voluntary Controlled Primary School are buildings too, and its movement joints, gutters and trims need looking after like any other building’s. If you live in an older home near Holy Trinity, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Stroud Green is about 2 miles north of Highbury, in Greater London. Anywhere in N4, we can carry out external mastic at your property. Our Greater London coverage runs to 764 places, and Stroud Green is one of them.
We work across N4, N8 and N19 for external mastic. Whether your property is on Ella Road, Lorne Road and Ridge Road or anywhere close by, our applicators can take on the job. With the A1201 close by, Stroud Green is simple for us to get to for external mastic. Nearby, we also carry out external mastic in Finsbury Park (1 mile south-east), Crouch End (1 mile west), Hornsey (1 mile north-west), Turnpike Lane (1 mile north) and Upper Holloway (1 mile south-west). Further out, we also cover London (5 miles south), City of Westminster (5 miles south-west), Marylebone (4 miles south), Kensington (7 miles south-west), St Pancras (3 miles south) and Shoreditch (4 miles south).
What’s near Stroud Green
In Stroud Green, that means homes and buildings near Hornsey School for Girls, Woodberry Down School and Stationers Park. There’s a railway station in Stroud Green itself: Harringay station. Nearby you will also find Montfichet's Tower (4.4 miles south) and Arsenal Football Club Museum (1.4 miles south). Green spaces nearby include Highgate Hill and Railway Fields.
What the job involves on each surface
Render joints
Water behind render can lead to blown patches. A sound joint keeps the render dry behind.
Joints between dissimilar materials
Where a frame or panel meets masonry, water often finds a way in. We cut out the old sealant and reseal with a product suited to both surfaces.