Greater London · England
External & façade joints in Cranham, Greater London
Movement joints in Cranham need attention? We cut out the old, prepare the joints and apply the right sealant, with a one-year guarantee.
- Leaking joints around cladding and façade panels
- Hard, crazed mastic that has stopped moving
- Rigid filler in a joint that should flex
External mastic for homes and businesses in Cranham
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 in a colour to suit. We’re often asked to deal with failed seals between different materials and water getting into walls through failed joints, across brickwork movement joints, render & cladding joints and copings & trims.
Outside work in London starts with access: side passages, upper floors and where to park. In Cranham, joints up high may need ladders or other access, which is worth talking through when you book.
There’s a 12-month guarantee on every job, whatever its size.
- Place
- Cranham (RM14)
- Region
- Greater London
- Cover
- 12 months on all our work
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Do you need external mastic in Cranham?
The wrong product in a moving joint is a classic cause. A stiff, general-purpose sealant cannot cope with a joint that moves a lot, so it pulls away from the edges.
Keep an eye out for any of the following:
- Failed sealant between panels on a façade
- Moss and dirt in joints with no sealant left
- Joints pointed up with cement by mistake
- Weathered mastic that no longer stretches
For site and facilities teams at buildings such as Hall Mead School, larger buildings have long runs of movement joint that eventually need resealing.
Comparing quotes
- Who turns up on the day
- How the surfaces are prepared before sealing
- How long the guarantee is
- What happens if the job turns out different
Different surfaces, different methods
Copings and trims
Joints in copings, parapets and trims are exposed to the worst of the weather. We reseal them with an exterior sealant suited to the material.
Brickwork movement joints
People sometimes point up a brick movement joint by mistake. Where one has been mortared, we cut it out and reseal it with sealant if the joint can be cleared.
External mastic in Cranham: local notes
Historic houses like Hare Hall (about 3 miles north-west) are a reminder that the area around Cranham 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. In terraces and conversions, gutters and walls are often shared with the neighbours, so it’s worth agreeing who is responsible before work starts.
Rented homes near Upminster station change hands often, and outside joints that have cracked can let damp into a rental, so check them between lets. For an older house near a landmark such as St Luke's Cranham, older walls, gutters and the joints where extensions meet them need a flexible sealant.
Cranham is about 2 miles east of Hornchurch, in Greater London. For external mastic in and around Cranham, please ring 0345 464 0079 or send us an email for a quick quote. We cover Greater London from our Crawley base. Our area takes in 764 places across Greater London, large and small. For nearby work, see our Chelmsford page.
Here we cover the RM14 postcode area for external mastic. That includes homes and businesses on Avon Road, Moor Lane and Front Lane. If you’re just outside Cranham, we cover Upminster (1 mile west), Puddle Dock (1 mile east), Upminster Bridge (1 mile west), North Ockendon (2 miles south-east) and Emerson Park (2 miles north-west). Further out, we also cover Shoreditch (15 miles west), Walthamstow (13 miles west), Hoxton (15 miles west), Whitechapel (15 miles west), Orpington (14 miles south-west) and Plaistow (11 miles west).
Local landmarks in Cranham
In Cranham, that means homes and buildings near The James Oglethorpe Primary School, The Crumpled Horn pub and St. Andrew's Park and the streets around them. For rail, the closest station is Upminster station, about 0.7 miles west. Other landmarks nearby include The Mercury Mall (3.7 miles west) and Upminster Tithe Barn Museum of Nostalgia (0.6 miles north-west). The countryside around Cranham includes Cranham Brickfields.
Nearby places to Cranham
Other services in Cranham
What sealant work can’t fix
New sealant can’t fix everything, and we will tell you before any work starts. Sealant will not put right:
- Loose or hollow render, which needs re-rendering
- Subsidence or other structural problems
- Damp that isn’t coming from the joint
If in doubt, phone 0345 464 0079 or drop us an email and we’ll say what we think.
Surfaces we seal
- Copings & trims
- Render & cladding joints
- Façade panels
- Joints between brick and frames
- Brickwork movement joints
- Concrete & block
Why it’s worth doing now in Cranham
A failed movement joint lets water into the wall and can run behind render or cladding. Resealing early keeps the job to the joint itself, instead of the wall and finishes around it. In a London flat, a failed joint rarely stays your problem alone: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
The cost depends on the amount of work, how hard the old material is to remove and how easy the joints are to reach. We give a clear quote before work begins.
Why us?
- We never seal over old sealant
- Over 20 years’ experience
- We agree the colour with you first
- We’re fully insured
See our cost guide or our reviews.
Landlords, agents and businesses in Cranham
Whether it’s one flat or a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we’ll quote.
How the visit works
On the day, we look over the joints with you first, so you know exactly what we’re doing. Surfaces next to the work are protected before any work begins. Most jobs take a few hours to a few days, depending on the length of joint and the access. In Cranham, as in most of London, parking needs a little planning. It helps if you can point us to a visitor permit or a bay close to the door.
- First, the joints are inspected and the access agreed.
- Every bit of old sealant and any mortar or debris is cut out.
- Joint faces are cleaned back and primed if the sealant needs it.
- We fit closed-cell backing rod to control the depth.
- We apply the sealant, tool it and check the whole run.
How to prepare
- Tell us about access, such as stairs, a lift or high-level joints
- Plan for the work area to be out of bounds to pets and children
- On commercial sites, let us know about site rules
Ask for a quote
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we will explain how we’d tackle it. Whenever you’re ready, ring 0345 464 0079 or send us an email.
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What affects the quote in Cranham
Some jobs are bigger than they look, and some smaller. The main factors:
- Working hours on commercial sites
- Whether old sealant or filler has to be cut out
- The size of the job
- Mould in or behind the old joints
What you pay reflects the work, not a rough estimate. That’s why we ask a few questions first and agree the price before starting.
Asking for a quote
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- The problem you’ve noticed
- Photos by email, if that is easy
- Roughly how big the job is
- How we’d reach the joints
Every job is quoted individually, so the first step is telling us about yours. Just phone 0345 464 0079 or drop us an email with the details, and pictures are welcome.
Questions from Cranham
Is Cranham in your area for external mastic?
Yes. We work across London and the South East, and Cranham is part of that. You can phone 0345 464 0079 or drop us an email and let us know what needs doing, and we will send you a clear quote.
Can parking be tricky for a visit in Cranham?
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.
When is the sealant fully cured?
Cure times vary by product and the temperature. Before we leave, we’ll tell you the cure time.
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.
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.
Can you seal over the old sealant?
No. We remove every bit of old sealant first, so the new joint bonds to clean surfaces.
What colours does the sealant come in?
We aim for a joint that suits the wall rather than one that jumps out. We will talk through colour options before we start from the range available.
Do you have insurance?
Yes. Full insurance covers our work, and we can confirm the details when we quote.