Greater London · England
External Mastic in Sudbury
Problem with your movement joints in Sudbury? We cut out the old, prepare the joints and apply the right sealant, and the work is guaranteed for a year.
- Hard, crazed mastic that has stopped moving
- Sealant that has lost its bond to the brick or render
- Water getting into walls through failed joints
External mastic in Sudbury, done properly
As ARBOMaster approved applicators, we choose exterior sealants to suit the joint and the surfaces. Porous or awkward surfaces are primed where the sealant needs it, and we do not skip that step. We work on concrete & block, copings & trims and render & cladding joints, and the jobs we see most are failed seals between different materials and brick movement joints where the sealant has split.
Working on the outside of a London home means planning access: shared paths, upper floors and parking. For a home in Sudbury, tell us how high the joints are and how to reach the back of the building.
You get a 12-month guarantee, the same in Sudbury as everywhere else we work.
- Place
- Sudbury (HA0, UB6, HA1)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
External mastic in Sudbury: local notes
London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. With historic houses such as Northolt Manor (about 2.2 miles west) nearby, there’s older building stock in the area around Sudbury as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth.
For landlords with property near Sudbury & Harrow Road station, split movement joints are easy to miss on a rental until damp shows inside. If you look after a building such as Sudbury Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. For an older house near a landmark such as Church of St Andrew, older walls, gutters and the joints where extensions meet them need a flexible sealant.
Sudbury is about 1 mile south-west of Wembley, in Greater London. Every kind of property in Sudbury can book us for external mastic, old or new, large or small. Every job comes with our 12-month guarantee. 764 places in Greater London are on our list. We also work in London, around 10 miles away.
Here we cover the HA0, UB6 and HA1 postcode area for external mastic. We cover properties on Elms Lane, Harrow Road and Perrin Road. With the A4005 close by, Sudbury is easy for our applicators to reach. Other places close to Sudbury include Sudbury Hill (1 mile east), North Wembley (1 mile east), Brondesbury Park (1 mile east), Harrow on the Hill (1 mile north-west) and Perivale (1 mile south). Further out, we also cover London (10 miles east), City of Westminster (8 miles east), Marylebone (8 miles east), Kensington (6 miles south-east), St Pancras (9 miles east) and Shoreditch (11 miles east).
What’s near Sudbury
Typical jobs here are in homes near Preston Park, Wembley High Technology College and Orley Farm School. Sudbury has its own railway station: Sudbury & Harrow Road station. Nearby you’ll also find London Designer Outlet (1.5 miles east) and Clementine Churchill Hospital (0.9 miles north-west). For a walk, there’s Castlebar Hill and Perivale Wood.
What affects the cost of external mastic
We quote each job individually. This is what makes a difference:
- Working hours on commercial sites
- Whether there’s mould to deal with
- How many areas need sealing
- The type of sealant required
Every job is a little different, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all make a difference, and we will explain the quote if you ask.
Asking for a quote
To help us quote quickly, let us know:
- The problem you’ve noticed
- If someone has resealed it before
- If it’s domestic, commercial or a hotel
- A few photos by email, if you can
To get a quote, call 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. You’ll have a clear quote before any work starts.
How the visit works
On the day, there’s very little for you to do. Point us to the joints and we’ll get on with it. The work itself takes a few hours to a few days, depending on the length of joint and the access from start to finish. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Sudbury. It helps if you can point us to a visitor permit or a bay close to the door.
- We look at every joint and agree a colour to suit the wall.
- Failed sealant is removed back to clean, sound faces.
- 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.
How to prepare
- Let us know if you’ve seen damp or leaks
- Move anything stored near the joints
- On commercial sites, let us know about site rules
How to get a quote
Asking for a quote is easy: let us know what needs doing and where and its rough size. A few photos by email make the job easier to understand.
Advice
Nearby places to Sudbury
More services for Sudbury
DIY versus a professional finish
A DIY attempt does not rule out a professional job. We remove it and do the joint properly.
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
For landlords and businesses
Whether it’s one flat or a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
Housing providers, facilities teams and property managers book us too. We can quote a run of properties together, and we’re fully insured for the work.
What happens if it’s left?
Water gets in through a failed movement joint and can run behind render or cladding. Resealing early keeps the job to the joint itself, rather than the wall around it. In a flat in Sudbury, failed sealant seldom stays inside your own four walls: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
Instead of a standard rate, we look at what your job involves: the amount of work, the old material and the access. The price is agreed before we begin.
What you get with us
- Quality sealants from Arbo and Everbuild
- More than 20 years in sealant work
- Rated 4.9 stars on Google
- Sanitary silicone with an anti-fungal additive in wet areas
Take a look at how sealant jobs are priced and our reviews.
Aftercare tips
How long the joints last depends on use and care. Here’s what we suggest:
- Leave the joints unpainted unless we’ve said otherwise
- Show decorators and builders where the movement joints are
- Get split or bare joints resealed while the damage is small
- 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.
Leave a failed movement joint and water keeps getting into the wall. That can lead to damp patches, staining and frost damage, all bigger jobs than a reseal.
Questions from Sudbury
Is Sudbury in your area for external mastic?
Yes. Our work covers London and the South East, and Sudbury is part of that. Just ring 0345 464 0079 or send us an email with a few details of the job.
Can parking be tricky for a visit in Sudbury?
Parking in Sudbury, as in most of London, takes a little planning: a visitor permit or a nearby bay makes the day run more smoothly.
Do you do commercial work?
Yes. Hotels, offices and other businesses use us.
When will the joints need doing again?
It varies from wall to wall: joints on exposed walls or with a lot of movement age sooner. A yearly look will tell you when they need doing. Our work comes with a 12-month guarantee.
Do you work for landlords and businesses?
Yes, often. Several properties can go on one quote.
How do you reach high-level joints?
It depends on the height and the site. Ground-floor joints are simple; for higher ones, send details and we will confirm the access.
Is there a guarantee?
Yes. All our work carries a 12-month guarantee.
Where is Mr Mastic based?
Our base is Crawley, with over 20 years’ experience. Our area covers South East England, London and Scotland.
What sealant work can’t fix
Sealant is not the answer to every problem, and we will tell you before work begins. Sealant will not put right:
- Failed render or damaged cladding panels
- Damp that is not coming from the joint
- Cutting new joints into brickwork, which is building work rather than sealant work
If you’re not sure, just ring 0345 464 0079 or email us and we’ll give you a straight answer before you book.
What we seal
- Concrete & block
- Render & cladding joints
- Façade panels
- Joints between brick and frames
- Brickwork movement joints
- Copings & trims