Greater London · England
External & façade joints in Hanger Hill, Greater London
External mastic across Hanger Hill and nearby, with every bit of old sealant taken out first.
- Sealant pulling away from one side of the joint
- Rigid filler in a joint that should flex
- Old sealant gone brittle and cracked
How we handle external mastic in Hanger Hill
Low-level joints can usually be done from the ground. Where joints are higher up, tell us about the building when you get in touch and we will confirm what’s needed to reach them safely. If you are dealing with rain getting behind render or cladding at a joint and movement joints filled with mortar instead of sealant, we can help, whatever the surface.
Working on the outside of a London home means planning access: shared paths, upper floors and parking. In Hanger Hill, joints up high may need ladders or other access, which is worth talking through when you book.
All of our work is guaranteed for twelve months, and the guarantee is the same wherever you are.
- Place
- Hanger Hill (W3, W5, NW10)
- Region
- Greater London
- Cover
- A year, on every job
- Price
- A clear price before work begins
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
What affects the cost of external mastic
Your quote is based on your job. We look at:
- The product the joint needs
- Any mould that needs treating
- How many areas need sealing
- Any working-time requirements on site
A failed joint rarely gets cheaper to fix by waiting. If you’re unsure, phone 0345 464 0079 or drop us an email for an honest opinion and a quote.
Helping us quote
Before you ask for a quote, have a think about:
- The problem you’ve noticed
- The type of property
- Photos by email, if that is easy
- 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, and we will take it from there.
Should I try it myself first?
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
Hanger Hill: your questions answered
Is parking a problem for a job in Hanger Hill?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. The visit is then planned around what’s available.
Do you cover Hanger Hill for external mastic?
Yes. We work across London and the South East, and Hanger Hill is part of that. You can call 0345 464 0079 or send us an email and let us know what needs doing.
When will the joints need doing again?
There’s no fixed answer: sunny, exposed elevations and busy joints wear faster. A yearly look will tell you when they need doing. Our work comes with a one-year guarantee.
Is there a guarantee?
Yes. All our work carries a one-year guarantee.
Do I have to be there?
If the work is inside, we need someone to let us in. After that, you can carry on with your day.
When is the sealant fully cured?
Many sealants skin over quickly but take longer to cure fully. We’ll give you the cure time for the product we used before we leave.
What’s an expansion joint in brickwork?
Most straight vertical gaps in brickwork are movement joints. It gives the wall room to move, and it should be sealed with a flexible sealant.
Do you work for hotels and businesses?
Yes. Hotels, offices and other businesses use us and we are fully insured.
Why deal with it now?
Sealing over the top of old mastic doesn’t hold for long. New sealant doesn’t bond well to old, weathered sealant, so we always take the old sealant out. In London conversions, one flat’s bathroom is often above another flat’s ceiling, and a slow leak from a failed seal can end up in the flat below. Dealing with it early is far simpler.
Doing several joints on one visit is usually more efficient than separate visits, so tell us about everything that needs sealing. We will give you a clear price for the lot.
Why choose Mr Mastic in Hanger Hill
- Quality sealants from Arbo and Everbuild
- An ARBOMaster approved applicator
- You choose the colour before work begins
- 180+ five-star Google reviews
Keeping the joints in good condition
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Keep water from gutters off the wall
- Act on the first splits you see
- Tell anyone working on the walls about the movement joints
- Wash walls gently around the sealant
Look over the joints once a year, ideally after winter. Watch for splits, edges coming away or growth in the joint.
Act while the splits are small. At that stage it’s a simple cut out and reseal.
Nearby places to Hanger Hill
More services for Hanger Hill
Walls and rooflines in Hanger Hill
London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. In terraces and conversions, gutters and walls are often shared with the neighbours, so check who is responsible for the outside before booking.
Managing a site like Holy Family Catholic Primary School? Then larger buildings have long runs of movement joint that eventually need resealing. If you live in an older home near Church of the Ascension, older walls, gutters and the joints where extensions meet them need a flexible sealant. Hanger Hill is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Hanger Hill is about 1 mile north-west of Acton, in Greater London. For external mastic in and around Hanger Hill, it’s easy to get a quote: please phone 0345 464 0079 or email us. We’re based in Crawley and cover Greater London, Hanger Hill included. Hanger Hill is one of 764 towns and villages in Greater London where we work. London is on our list too, about 8 miles from Hanger Hill.
Jobs for external mastic in W3, W5 and NW10 is quoted and booked the same way as anywhere else. External mastic is available to properties on Noel Road, Vale Lane and Links Road. Close by, we work in Park Royal (1 mile north-east), West Twyford (1 mile north), Acton (1 mile south-east), South Acton (1 mile south) and Acton Green (2 miles south-east). We also work in nearby towns such as London (8 miles east), City of Westminster (6 miles east), Marylebone (6 miles east), Kensington (4 miles east), St Pancras (7 miles east) and Shoreditch (9 miles east).
Landmarks near Hanger Hill
Around Hanger Hill, our work takes us to homes and buildings near The Ellen Wilkinson School for Girls, The Sir Michael Balcon pub and Library for Iranian Studies. You’ll also find The Ellen Wilkinson School for Girls (within half a mile south-west) and Ealing Common (0.7 miles south-west). The nearest railway station is Acton Main Line station, about 0.7 miles east of the centre. A little further out are Central Middlesex Hospital (1 mile north-east) and London Transport Museum Depot (1 mile south). Green spaces nearby include Castlebar Hill and Hanger Hill Wood.
The process
All our tools and materials come with us in the van, so there’s nothing for you to buy. After a quick look at the joints together, we protect the area and start. Most jobs take anything from a few hours to several days, depending on the building. For a job in Hanger Hill, parking and access are the things to plan: let us know about parking, the floor we will be working on and any lift or shared entrance.
- We start by walking round the building and agreeing the joints and the access.
- We cut out the old mastic and rake out anything in the joint.
- Joint faces are cleaned back and primed if the sealant needs it.
- We fit closed-cell backing rod to control the depth.
- The exterior sealant is applied, tooled and checked along its length.
Preparing for the visit
- Clear items away from the joints we’re working on
- Let us know if you’ve seen damp or leaks
- Tell us about access, such as stairs, a lift or high-level joints
How to get a quote
Every job is quoted individually, so start by telling us what you need. Simply ring 0345 464 0079 or drop us an email and describe the job, and pictures are welcome.
Related advice
Work for landlords, hotels and businesses
Whether it’s one flat or a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a one-year guarantee.
For anyone letting property in or around Hanger Hill, jobs at different addresses can go on one quote. Just tell us the addresses and what each one needs.
When it isn’t the sealant
Some problems need a builder, plumber or other trade rather than us:
- Cracked brickwork or render that needs a builder or plasterer
- Structural movement, which needs a surveyor or engineer
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
If in doubt, phone 0345 464 0079 or drop us an email and we will say what we think.
Joints and surfaces we work on
- Render & cladding joints
- Joints between brick and frames
- Brickwork movement joints
- Concrete & block
- Façade panels
- Copings & trims