Greater London · England
External & façade joints in Aldgate, Greater London
External mastic for Aldgate, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Gaps where render, brick and frames meet
- Rigid filler in a joint that should flex
- Brick movement joints where the sealant has split
External mastic in Aldgate
We’re ARBOMaster approved applicators, and each external joint gets a sealant suited to it. Some surfaces need a primer before sealing and we use one wherever it does. We work on copings & trims, render & cladding joints and joints between brick and frames, and the jobs we see most are cracked joints where brick meets render or frames and moss and dirt in joints with no sealant left.
Newer London blocks are built with movement joints in brick and render, and with cladding joints sealed with mastic. Older terraces have their own weak points: gutter joints, roofline trims and the joint where an extension meets the original wall, and both kinds of building are found across London.
All our work is covered by our one-year guarantee.
- Where
- Aldgate (E1, EC2A, SE1)
- Region
- Greater London
- Guarantee
- One year on every job
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Aftercare tips
Once the sealant has cured, a few habits help it last:
- Keep movement joints as flexible joints, not mortar
- Deal with leaking gutters that soak the joints below
- Wash walls gently around the sealant
- Do not let climbing plants root in the sealant
Follow the cure time we give you before the joint is knocked or disturbed. The surface skins over quickly, but full cure takes longer.
Small splits are the time to act. Then it’s a straightforward cut-out and reseal.
Quotes for external mastic in Aldgate
You will get a clear quote before we start. It takes into account:
- The number and length of the joints
- Any working-time requirements on site
- The old material and how stubborn it is
- Mould in or behind the old joints
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:
- Pictures of the joints, sent by email
- The rough size of the job
- Whether it’s a home or a business
- What the problem is, such as mould, gaps, leaks or cracking
Call for a quick quote, or send an email if you’d rather. Describe what needs sealing and we will explain what’s involved.
Questions from Aldgate
Can you help a landlord with a rental near London Fenchurch Street station?
Yes, we work for landlords and agents. You can call 0345 464 0079 or drop us an email with the address and a few details, and we’ll give you a fixed price before any work starts.
Is Aldgate in your area for external mastic?
Yes. We work across London and the South East, and Aldgate is part of that. You can call 0345 464 0079 or email us and tell us what needs doing, and we will send you a clear quote.
Will the new joint stand out?
There’s a good range of exterior colours, including greys, browns, whites and stone tones. We pick the one that suits your wall best so it doesn’t stand out.
Is it OK to seal over old sealant?
No, and we never do. It can look neat for a few weeks, but the new bead soon lifts. The old sealant has to come out completely.
Do the sealants smell?
Sometimes, a little. Any smell clears as the sealant cures, and ventilation helps.
Can you quote for more than one area?
Yes, we can. Several rooms, windows or areas can go on one quote.
Where do you work from?
We work from Crawley. Our applicators cover Aldgate.
Is it OK to fill a movement joint with cement?
No, not where the gap is a movement joint. Filling it with mortar defeats its purpose and can lead to cracking. A flexible sealant is the right fill.
Common problems we fix in Aldgate
Many joints fail because they were sealed too deep or with nothing behind them. Sealant bonded to three sides has nowhere to go and tears as soon as the joint widens.
Most people get in touch when they notice something like this:
- Sealant pulling away from one side of the joint
- Panel joints letting water in
- Rigid filler in a joint that should flex
- Old sealant gone brittle and cracked
If you live in an older home near St James Duke's Place, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Before booking anyone
- What happens if they find a problem under the old sealant
- Whether you can choose the colour
- How the surfaces are prepared before sealing
- Who turns up on the day
Surface by surface
Cladding and façade panels
Panels heat up and cool down quickly, so the joint sealant has to cope with frequent movement. The sealant is chosen with that in mind.
Brickwork movement joints
Vertical joints in long brick walls let the brickwork expand without cracking. We reseal them with a low-modulus sealant over backing rod in a colour to suit the brick.
Work for landlords, hotels and businesses
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements and we’ll give you a quote.
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.
Nearby places to Aldgate
More services for Aldgate
The process
A visit follows a simple pattern: we check the joints, mask and protect the surrounding surfaces, carry out the job and clear up. It usually takes a few hours for a handful of joints, longer for a whole elevation. For a job in Aldgate, parking and access are the things to plan: tell us about permits, visitor bays or off-street space, which floor we are working on and whether there’s a lift.
- First, the joints are inspected and the access agreed.
- Every bit of old sealant and any mortar or debris is cut out.
- The faces are brushed clean and primed where the product requires it.
- Backing rod sized to the joint goes in to set the depth.
- We apply the sealant, tool it and check the whole run.
How to prepare
- Mention any sign-in or site rules at work premises
- Let us know about parking restrictions
- Tell us about any water getting in
Get a quote
If you are in Aldgate and need external mastic, phone 0345 464 0079 or email us. A short description of the job and where it is helps us quote, and we will agree the price before any work begins.
Advice
DIY sealant or a professional job?
A DIY attempt does not rule out a professional job. We remove it and do the joint properly, so just mention it when you contact us.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.
Outside joints around Aldgate
London terraces and converted houses often share gutters, downpipes and walls, so check who is responsible for the outside before booking. With historic houses such as Mansion House (about 0.5 miles west) nearby, there’s older building stock in the area around Aldgate as well as newer homes. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material.
As a London address, Aldgate can be tricky for parking: tell us about permits, visitor bays or off-street space when you book. For site and facilities teams at buildings such as The Aldgate School, larger buildings have long runs of movement joint that eventually need resealing.
Aldgate is about 1 mile north-east of London, in Greater London. For external mastic in and around Aldgate, please ring 0345 464 0079 or drop us an email for a quick quote. We’re based in Crawley and cover Greater London. Our area takes in 764 places across Greater London, large and small.
Jobs for external mastic in E1, EC2A and SE1 is quoted and booked the same way as anywhere else. Whether your property is on Bush Lane, Swan Lane and Mark Lane or anywhere close by, our applicators can take on the job. Aldgate is on the A3 and A10, which makes it straightforward to reach. Nearby, we also carry out external mastic in Spitalfields (1 mile north-east), Bishopsgate (1 mile north-west), Tower Hill (1 mile south), Whitechapel (1 mile north-east) and City of London (1 mile west). Within a short drive, we also cover City of Westminster (3 miles west), Marylebone (3 miles west), Kensington (5 miles west), Walthamstow (6 miles north-east), Hampstead (5 miles north-west) and Ruislip (15 miles west).
Local landmarks in Aldgate
Locally, jobs take us to homes and businesses close to Bishopsgate Institute Special Collections and Archives, Fund Academy and East India Arms. Also close by are London Enterprise Academy (0.6 miles east), St Mary-at-Hill (under half a mile south-west) and Finsbury Circus (0.5 miles north-west). Aldgate has its own railway station: London Fenchurch Street station. A little further out are Gabriel's Wharf (1.4 miles west) and Tower of London (within half a mile south). Not far away are St. James's Park Lake and Lavender Pond.