Greater London · England
Wood Green External Mastic
External mastic for Wood Green, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Rigid filler in a joint that should flex
- Leaking joints around cladding and façade panels
- Movement joints with cracked, split or missing sealant
FAQs for Wood Green
Do you cover Wood Green for external mastic?
Yes. Our work covers London and the South East, and Wood Green is part of that. You can ring 0345 464 0079 or send us an email and let us know what needs doing, and we’ll give you a clear price.
Is parking a problem for a job in Wood Green?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot, so mention what’s available when you book.
Do you work for hotels and businesses?
Yes. Larger jobs can be planned room by room or area by area.
What should I tell you?
Where the job is, what the problem is and roughly how big it is. If you can, email a few pictures.
Can new sealant go over the old?
No. New silicone won’t bond to old silicone, and anything trapped underneath, including mould and water, stays there. We remove it all first.
Will you leave a mess?
We keep the work tidy. We protect what’s around the joints, and the area is left clean when we finish.
Where is Mr Mastic based?
Our base is Crawley, with over 20 years’ experience. Our area covers South East England, London and Scotland.
Does someone need to be in?
Access is agreed with you when the job is booked. Indoors, that generally means someone at home.
How we handle external mastic in Wood Green
Joints between dissimilar materials, like brick against render or concrete against a steel frame, see movement from both sides. A flexible exterior sealant takes up that movement where mortar or filler would crack. Typical jobs include joints pointed up with cement by mistake and leaking joints around cladding and façade panels, on concrete & block, brickwork movement joints and render & cladding joints.
Outside work in London starts with access: side passages, upper floors and where to park. For a home in Wood Green, tell us how high the joints are and how to reach the back of the building.
Every job is covered by our one-year guarantee, wherever you are in Greater London.
- Location
- Wood Green (N22, N8)
- Wider area
- Greater London
- Guarantee
- One year on every job
- Quote
- A clear price before work begins
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Common problems we fix in Wood Green
A lot of failed joints come down to preparation: dusty or wet faces, no primer where one was needed, or old sealant left in. The sealant never bonds properly.
Look out for any of the following:
- Brick movement joints where the sealant has split
- Rain getting behind render or cladding at a joint
- Sealant pulling away from one side of the joint
- Rigid filler in a joint that should flex
Rented homes near Alexandra Palace station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Questions to ask before you book
- What the quote includes, VAT included or not
- Which sealant they’ll use, and why
- The length of the guarantee
- Who does the work, and how experienced they are
Keeping the joints in good condition
After the cure time, these simple habits help:
- Never let anyone fill a movement joint with mortar
- Check the sealant is paintable before painting near it
- Tell anyone working on the walls about the movement joints
- Clear growth from the base of walls and joints
Have a quick look at the joints each spring. Splits, gaps at the edges or plants in the joint are early warning signs.
A joint that has stopped moving pushes the movement elsewhere, normally as cracking in the brickwork or render nearby. Catch it early and you reduce the risk.
Outside joints around Wood Green
London terraces and converted houses often share gutters, downpipes and walls, so it’s worth agreeing who is responsible before work starts. Historic houses like Bruce Castle (about 1.4 miles east) are a reminder that the area around Wood Green has older buildings as well as new. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material.
For site and facilities teams at buildings such as St Michael's CofE Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. In the older streets around Church of St Michael and All Angels, an extension built onto an older house moves differently, and the joint between them takes the strain.
Wood Green is about 3 miles south-west of Edmonton, in Greater London. Wherever you are in the N22 postcode area, we cover external mastic for homes and businesses. Wood Green is one of 764 towns and villages in Greater London where we work for external mastic. There’s also a page for London, roughly 7 miles from Wood Green.
Every address in N22 and N8 is within our area for external mastic. If you need external mastic at a property on Vincent Square, Station Road and Gathorne Road or a nearby road, we can help. Wood Green sits on or near the B151. Nearby, we also carry out external mastic in Noel Park (1 mile south-east), Turnpike Lane (1 mile south), Hornsey (1 mile south-west), Crouch End (1 mile south-west) and Stroud Green (2 miles south). Further out, we also cover London (7 miles south), City of Westminster (6 miles south), Marylebone (6 miles south), Kensington (8 miles south-west), St Pancras (5 miles south) and Shoreditch (5 miles south).
Near you in Wood Green
We work in homes and buildings around St Thomas More Catholic School, Woodside Park and The Nag's Head pub. For rail, the closest station is Alexandra Palace station, about 0.5 miles west. Other landmarks nearby include Broomfield House Museum (1.3 miles north) and The Mall Wood Green (less than half a mile south). The countryside around Wood Green includes Railway Fields and Highgate Hill.
Honest limits
A few problems are outside what sealant work can do:
- Failed render or damaged cladding panels
- Cracks in the bricks or render themselves, away from the joints
- Walls that need new movement joints cut into them
If you are not sure, just ring 0345 464 0079 or email us and we’ll give you a straight answer before you book.
Joints and surfaces we work on
- Render & cladding joints
- Concrete & block
- Copings & trims
- Brickwork movement joints
- Joints between brick and frames
- Façade panels
Should I try it myself first?
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it peels away and traps moisture behind it. All the old material has to come out first.
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
For landlords and businesses
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements.
In hotels, rooms out of use cost money, so we plan the work room by room. Hotel work is part of what we do, alongside homes and businesses.
What we do, step by step
We keep the work tidy and contained to the joints we’re treating, so you can get on with your day. The job usually takes anything from a few hours to several days, depending on the building, and we explain the cure time before we leave. In a London area like Wood Green, the main things to plan are parking and access: tell us about permits, visitor bays or off-street space, which floor we’re working on and whether there’s a lift.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- We cut out the failed sealant and rake out any dirt or growth.
- Both sides are cleaned back to sound material and primed if needed.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Before we arrive
- Keep pets and children clear of the area while we work
- Clear the area around the work
- Tell us about access, such as stairs, a lift or high-level joints
Ask for a quote
To get a quote, ring 0345 464 0079 or send us an email with the location and a short description of the problem. We’ll send you a clear quote before any work starts.
Advice
What affects the cost of external mastic
Jobs vary more than people expect. The main factors:
- How many rooms, windows or areas are involved
- Any mould that needs treating
- The amount of work
- Whether the work is at height
There are no prices on our website, because the cost depends so much on the job itself. Call for a quick quote and we will talk you through it.
What we need to know
Photos by email are helpful but not essential. Try to tell us:
- Roughly how big the job is
- Any previous sealing or DIY work
- Photos by email, if that is easy
- The type of property
Every job is quoted individually, so start by telling us what you need. Simply phone 0345 464 0079 or send us an email and describe the job.