Greater London · England
External & façade joints in Woodside, Greater London
Sealing brickwork movement joints, render, cladding and façade joints for homeowners, landlords and businesses in Woodside. Fully insured, ARBOMaster approved and guaranteed for a year.
- Movement joints with cracked, split or missing sealant
- Failed seals between different materials
- Moss and dirt in joints with no sealant left
About our external mastic in Woodside
A movement joint is a deliberate break that lets a wall expand and contract. Its sealant has to flex with the building, season after season, so once it splits or hardens, the joint stops working and water gets in. We work on concrete & block, brickwork movement joints and façade panels, and common reasons people get in touch are rain getting behind render or cladding at a joint and joints pointed up with cement by mistake.
Modern London flats rely on sealed movement joints and cladding joints. 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.
Each job carries a 12-month guarantee, whatever its size.
- Where
- Woodside (CR0, SE25, CR9)
- Wider area
- Greater London
- Guarantee
- A year, on every job
- Quotes
- A clear price before work begins
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
What sealant work cannot fix
New sealant cannot fix everything, and we’d rather say so up front. It will not solve:
- Cutting new joints into brickwork, which is building work rather than sealant work
- Subsidence or other structural problems
- Cracked brickwork or render that needs a builder or plasterer
If in doubt, phone 0345 464 0079 or email us and we’ll say what we think before booking.
What we seal
- Brickwork movement joints
- Render & cladding joints
- Concrete & block
- Façade panels
- Joints between brick and frames
- Copings & trims
Nearby places to Woodside
What else we do in Woodside
What affects the quote in Woodside
The price is agreed before any work begins. It’s based on:
- The old material and how stubborn it is
- The number of rooms or windows
- Whether the work is at height
- The product the joint needs
What you pay reflects the work, not guesswork. That is why we ask about the job first.
What we need to know
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- How we’d reach the joints
- The address or postcode of the job
- What the problem is, such as mould, gaps, leaks or cracking
- Any previous sealing or DIY work
For external mastic in Woodside, ring 0345 464 0079 or send us an email. Tell us what the problem is and where, and you will get a clear quote before any work starts.
What happens if it’s left?
The longer a joint stays open, the more water the wall takes in. In cold weather, frost can damage wet brick and render around the joint, so the damage spreads beyond the joint. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in Woodside, the repair is bigger than a sealant job.
What it costs depends on the amount of work, how hard the old material is to remove and access to the work. You’ll have a clear quote before any work starts, so you know where you stand.
Why choose Mr Mastic in Woodside
- An ARBOMaster approved applicator
- One-year guarantee on every job
- Experience in homes, commercial sites and hotels
- 20+ years of sealant experience
For landlords and businesses
If you manage several properties in or around Woodside, several properties can go on one quote. Send us the addresses and the work at each.
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
Woodside questions
I let a flat near Norwood Junction station. Can you help?
Yes, rental work is part of what we do. You can call 0345 464 0079 or send us an email with the address and a few details, and we will give you a fixed price before work begins.
Is parking a problem for a job in Woodside?
Parking in Woodside, as in most of London, takes a little planning: a visitor permit or a nearby bay makes the day run more smoothly.
Do you cover Woodside?
Yes. We work in Woodside, as part of our work across South East England, London and Scotland. To book, call 0345 464 0079 or drop us an email.
Do you work for hotels and businesses?
Yes. Commercial and hotel work is a large part of what we do, as well as homes. Working times can be discussed when we quote.
What’s an expansion joint in brickwork?
Walls move with heat, cold and moisture, and planned joints take up that movement. It’s closed with backing rod and a flexible sealant.
Should I try DIY first?
Some simple jobs can be done by a careful DIYer. Most DIY failures come from sealing over old material, wet joints or too much sealant.
How long does external mastic take?
It depends on the size of the job, but most jobs take a few hours to a few days, depending on the length of joint and the access. We will give you a better idea when we quote.
Do I have to be there?
That depends on where the joints are. For work indoors, someone needs to let us in, while outside work can sometimes be arranged differently.
How to look after the new joints
Joint life depends on how it’s used and looked after. We suggest:
- Avoid pressure-washing directly into sealant joints
- Have failed joints looked at early
- Ask before painting over external sealant
- Clear growth from the base of walls and joints
Keep the joints clear of soil, plants and climbing growth. Anything that holds water against the joint wears it out sooner.
Once a joint cannot move, the wall finds another way, often as cracks near the joint. Resealing it early helps prevent that.
How it works
When we arrive, we start by going over the job with you, so you know exactly what we are doing. Surfaces next to the work are protected before any work begins. The work usually takes a few hours for a handful of joints, longer for a whole elevation. In Woodside, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- We look at every joint and agree a colour to suit the wall.
- Failed sealant is removed back to clean, sound faces.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- We prime the faces where required.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Preparing for the visit
- Keep children and pets away from the work area
- Tell us about access, such as stairs, a lift or high-level joints
- Tell us about any previous sealing or DIY attempts
Get a quote
There’s no standard price list. Instead, your job gets its own clear quote. To arrange one, phone 0345 464 0079 or drop us an email.
Advice
What we are called out for in Woodside
UV, rain and frost all age exterior sealant. In time it goes hard, crazes on the surface and stops stretching, so the joint eventually tears or comes away from one side.
Most people get in touch after spotting one of these:
- Gaps where render, brick and frames meet
- Movement joints filled with mortar instead of sealant
- Moss and dirt in joints with no sealant left
- Hard, crazed mastic that has stopped moving
As a London address, Woodside can be tricky for parking: let us know about parking bays, permits or a driveway.
What your quote should include
- What product goes in the joint
- When the joint can take water or movement
- Whether they’re fully insured
- Whether VAT is included
What external mastic looks like in Woodside
In terraces and conversions, gutters and walls are often shared with the neighbours, so check who is responsible for the outside before booking. Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Homes close to Church of St Luke include some older properties, and older walls, gutters and the joints where extensions meet them need a flexible sealant. For site and facilities teams at buildings such as St Thomas Becket Catholic Primary School, larger buildings have long runs of movement joint that eventually need resealing.
Woodside is about 6 miles south of New Cross, in Greater London. Every kind of property in Woodside is covered for external mastic. Every job comes with our 12-month guarantee. Our Greater London coverage runs to 764 places, and Woodside is one of them. You can also see our page for London, roughly 8 miles from Woodside.
Our applicators cover all of the CR0, SE25 and CR9 postcode area for external mastic and the streets around it. Streets in the area include Long Lane, Tudor Road and Coe Avenue, and we cover them all. Close by, we work in Ashburton (1 mile south), Addiscombe (1 mile south), Shirley Oaks (1 mile south-east), Monks Orchard (1 mile south-east) and Shirley (1 mile south-east). Within a short drive, we also cover London (8 miles north), City of Westminster (9 miles north-west), Marylebone (10 miles north), Kensington (10 miles north-west), St Pancras (10 miles north) and Shoreditch (10 miles north).
What’s near Woodside
Around Woodside, our work takes us to homes and buildings near The Beehive pub, Oasis Academy Shirley Park and Ashburton Park. The nearest railway station is Norwood Junction station, about 0.7 miles north-west. A little further out are Whitgift Centre (1.7 miles south-west) and Crystal Palace Museum (2.2 miles north). The countryside around Woodside includes Bramley Bank and Duppas Hill.