Greater London · England
External & façade joints in Edgware, Greater London
Movement joints in Edgware need attention? We cut out the old, prepare the joints and apply the right sealant.
- Joints pointed up with cement by mistake
- Brick movement joints where the sealant has split
- Failed seals between different materials
Leave it or put it right?
Pointing a movement joint with mortar might seem a neat fix, 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 Edgware, 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.
Leaving a failed joint normally makes the job bigger, not smaller, because water and mould keep working on it. If you’re not sure whether it needs doing, phone 0345 464 0079 or send us an email for an honest opinion and a quote.
Why choose Mr Mastic in Edgware
- We leave the area clean and tidy
- Full insurance on every job
- 4.9 on Google from 180+ five-star reviews
- ARBOMaster approved applicator
See what affects the cost or our reviews.
How we handle external mastic in Edgware
Joints in render and cladding are easy to overlook until a damp patch appears. We look over the joints, agree the ones to renew and reseal with a flexible, weatherproof product. If you have rigid filler in a joint that should flex and sealant pulling away from one side of the joint, we can help, on copings & trims, render & cladding joints and brickwork movement joints alike.
London’s terraces and conversions often share walls, gutters and downpipes with their neighbours, so one failed joint can cause damp for more than one household. For a flat in Edgware, check the lease for who looks after the outside.
You’re covered for a year from the day we finish. If anything is not right with it, phone 0345 464 0079 or drop us an email.
- Location
- Edgware (HA8, NW7, HA7)
- Region
- Greater London
- Guarantee
- A year, on every job
- Quotes
- A clear price before we start
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Places near Edgware
Other services in Edgware
FAQs for Edgware
Can you do external mastic in Edgware?
Yes. Our work covers London and the South East, and Edgware is part of that. You can phone 0345 464 0079 or drop us an email and tell us what needs doing.
Do you work for landlords with property near Mill Hill Broadway station?
Yes, we work for landlords and letting agents. Just phone 0345 464 0079 or email us and tell us about the property, and we will give you a clear quote.
Do I need to be at home?
For indoor joints, yes, someone needs to let us in. After that, you can carry on with your day.
Do you hold any approvals?
Yes. We are ARBOMaster approved, the scheme for applicators of Arbo sealants.
Do you take out the old sealant first?
Yes. All of the old material is cut out and the joint cleaned before applying anything new.
Are you insured?
Yes. Mr Mastic is fully insured.
What is a movement joint?
Most straight vertical gaps in brickwork are movement joints. It lets the bricks expand without cracking, and it should be sealed with a flexible sealant.
Is there a guarantee?
Yes, always. There’s a 12-month guarantee on every job, wherever you are.
Looking after it afterwards
To keep the joints looking good and working properly:
- Ask before painting over external sealant
- Act on the first splits you see
- Check external joints each spring
- Wash walls gently around the sealant
Don’t paint over the new sealant unless we have said the product is paintable. Paint can crack on a flexible joint and spoil the finish.
If you can see gaps, plants or bare sections in a joint, have it checked. Earlier resealing means a smaller job and a better result.
Work for landlords, hotels and businesses
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance that we can handle for you.
Housing providers, facilities teams and property managers book us too. We can quote a run of properties together, and we are fully insured.
Outside joints around Edgware
Historic houses like Headstone Manor (about 3.9 miles south-west) are a reminder that the area around Edgware has older buildings as well as new. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material. Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
As a London address, Edgware can be tricky for parking: let us know about parking bays, permits or a driveway. If you look after a building such as Beit Shvidler Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. If you let a flat or house near Mill Hill Broadway station, split movement joints are easy to miss on a rental until damp shows inside.
Edgware is about 4 miles west of Finchley, in Greater London. Across the HA8 area, we cover external mastic for homes and businesses. Edgware is one of 764 towns and villages in Greater London where we work for external mastic. We also work in London, about 11 miles from Edgware.
Here we cover the HA8, NW7 and HA7 postcode area for external mastic. Whether your property is on Station Road, Edgware Road High Street and Hillcrest Avenue or anywhere close by, we can help. With the A5100 close by, Edgware is easy for our applicators to reach for external mastic. Close by, we work in The Hale (1 mile east), Broadfields Estate (1 mile north), Burnt Oak (1 mile south-east), Canons Park (1 mile south-west) and Little Stanmore (1 mile south-west). Further out, we also cover London (11 miles south-east), City of Westminster (9 miles south-east), Marylebone (9 miles south-east), Kensington (9 miles south), St Pancras (9 miles south-east) and Shoreditch (10 miles south-east).
Landmarks near Edgware
Locally, jobs take us to homes and businesses close to The Northgate School, Railway Hotel and London Academy, among other places. Edgware’s nearest station is Mill Hill Broadway station, roughly 1.1 miles south-east. Other landmarks nearby include Hilfield Castle (3.6 miles north-west) and Broadwalk Centre (0.5 miles south-west). Green spaces nearby include Darland's Lake and Mill Hill Old Railway Nature Reserve.
DIY versus a professional finish
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
What affects the cost of external mastic
The price is agreed before any work begins. It’s based on:
- How easy the joints are to reach
- The number and length of the joints
- Any working-time requirements on site
- Any mould that needs treating
There are no prices on our website, because the cost depends so much on the job itself. For a quick quote, please ring 0345 464 0079 or send us an email.
What we need to know
Before you ask for a quote, have a think about:
- Any access issues, like height or stairs
- The address or postcode of the job
- Photos by email, if that’s easy
- Whether it’s a home or a business
We don’t publish a price list. Instead, your job gets its own clear quote. To arrange one, phone 0345 464 0079 or send us an email.
The process
The work is kept neat and contained to the area we’re working on, so you can carry on as normal. The job normally takes anything from a few hours to several days, depending on the building, and we tell you how long to leave it before we go. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. If the building has a concierge, managing agent or access rules, tell us when you book.
- First we look over the joints with you, agree which to renew and talk through access.
- Old sealant and any debris are cut and raked out.
- The joint faces are cleaned and primed where the sealant needs it.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
How to prepare
- On commercial sites, let us know about site rules
- Let us know if you’ve seen damp or leaks
- Move anything stored near the joints
Get a quote
For a quote, phone 0345 464 0079 or email us and tell us where the job is and what the problem looks like. You will have a clear quote before we start.
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Honest limits
New sealant can’t fix everything, and we’d rather say so up front. It won’t solve:
- Rising or penetrating damp from elsewhere in the wall
- Failed render or damaged cladding panels
- Cracks in the bricks or render themselves, away from the joints
Not sure which it is? You can ring 0345 464 0079 or email us and we will tell you honestly.
Where we work in Edgware
- Concrete & block
- Joints between brick and frames
- Copings & trims
- Render & cladding joints
- Façade panels
- Brickwork movement joints