Greater London · England
West Norwood External Mastic
External mastic for West Norwood and the surrounding area: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Joints where the bead has come unstuck
- Plants rooting in failed movement joints
- Rigid filler in a joint that should flex
Work for landlords, hotels and businesses
Mouldy or split sealant often shows up at the end of a tenancy. Several properties can go on one quote.
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance.
External mastic in West Norwood, done properly
Where two different materials meet, such as brick and render or blockwork and metal, they move at different rates. A flexible exterior sealant takes up that movement where mortar or filler would crack. We work on joints between brick and frames, render & cladding joints and concrete & block, and the jobs we see most are movement joints filled with mortar instead of sealant and weathered mastic that no longer stretches.
Outside work in London starts with access: side passages, upper floors and where to park. For a home in West Norwood, tell us how high the joints are and how to reach the back of the building.
There’s a 12-month guarantee on every job.
- Place
- West Norwood (SE19, SE27, SE21)
- Region
- Greater London
- Guarantee
- A year, on every job
- Quote
- A clear price before we start
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Why it’s worth doing now in West Norwood
A properly done movement joint is an even line in a colour that suits the wall. A rushed bead with no backing looks untidy and does not last. 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 for homes in West Norwood.
The cost depends on the size of the job, how hard the old material is to remove and access to the work. We give a clear quote before work begins, so you know where you stand.
Why us?
- Every job guaranteed for a year
- White, clear, grey or another colour, product permitting
- Full insurance on every job
- You choose the colour before work begins
Read what affects the cost or our reviews.
Looking after it afterwards
How long the joints last depends on use and care. We suggest:
- Make sure movement joints aren’t pointed over
- Keep soil, plants and ivy away from the joints
- Point out the joints to other trades
- Ask before painting over external sealant
Only paint over the joint if we have confirmed the sealant can take paint. Paint can crack on a flexible joint, and paint can crack as the joint moves.
Gaps, plants or missing sealant in a joint are worth getting looked at. Earlier resealing means a smaller job and a better result.
Your questions about external mastic in West Norwood
Can parking be tricky for a visit in West Norwood?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. That way the visit can be planned around it.
Do you work for landlords with property near West Norwood station?
Yes, landlords and agents are among the people we work for. You can phone 0345 464 0079 or send us an email with the details for a clear quote.
Should I try DIY first?
That depends on the joint. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional, while a short indoor joint may be within reach.
Can you reach joints on upper floors?
That depends on how high the joints are and the ground below. Ground-floor joints are simple; for higher ones, send details and we will confirm the access.
What is backing rod for?
The foam is closed-cell backing rod. It keeps the sealant at the right depth and bonded to the sides only.
What colours does the sealant come in?
We choose a sealant colour to suit the brick, stone or render, so the joint sits quietly in the wall. There’s a wide choice of exterior colours.
Should I point up the gap in my brickwork?
No. Rigid materials can’t move with the wall. If it has already been filled, we can generally cut it out and reseal it.
Can I add another job to the visit?
Yes, and it often makes sense. Combining jobs makes good use of the visit.
Towns and villages near West Norwood
What else we do in West Norwood
Can I do it myself?
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed first.
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Quotes for external mastic in West Norwood
Every job gets its own quote. This is what makes a difference:
- The number of rooms or windows
- Mould in or behind the old joints
- How much there is to do
- Which sealant suits the joint
Homes and businesses are quoted the same way: the amount of work, the access and the products needed. Call for a quick quote and we’ll explain what it covers.
What we need to know
Before you ask for a quote, have a think about:
- A few photos by email, if you can
- Any previous sealing or DIY work
- Access, such as stairs, a lift or height
- Roughly how big the job is
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and email pictures if that’s easy.
Different surfaces, different methods
Cladding and façade panels
Cladding and façade panels are normally separated by sealed joints. Each joint gets a sealant that suits the panel and its movement.
Concrete and blockwork
Blockwork and concrete shrink over time and move with the seasons. We reseal their joints with backing rod and a flexible product.
How it works
There isn’t much for you to do on the day. Show us the job and we’ll take it from there. The job generally takes a few hours to a few days, depending on the length of joint and the access. In a London area like West Norwood, the main things to plan are parking and access: let us know about parking, the floor we will be working on and any lift or shared entrance.
- First we look over the joints with you, agree which to renew and talk through access.
- Old sealant and any debris are cut and raked out.
- We clean both faces of the joint and prime them where the product calls for it.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
Getting ready for the visit
- Let us know if you’ve seen damp or leaks
- Let us know about earlier repairs to the joints
- Clear items away from the joints we’re working on
Getting a quote
For a quick quote, get us on the phone, or email us if that is easier. Tell us about the joints that need doing and we’ll talk you through the work before giving you a price.
Read more
What external mastic looks like in West Norwood
London terraces and converted houses often share gutters, downpipes and walls, so check who is responsible for the outside before booking. Historic houses like Kingswood House (about 0.6 miles east) are a reminder that the area around West Norwood 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.
Managing a site like St Luke's Church of England Primary School? Then larger buildings have long runs of movement joint that eventually need resealing. As a London address, West Norwood can be tricky for parking: let us know about parking bays, permits or a driveway. For an older house near a landmark such as West Norwood Congregational Church, older walls, gutters and the joints where extensions meet them need a flexible sealant.
West Norwood is about 5 miles south of London, in Greater London. Homes, rented property, offices and hotels in West Norwood can book us for external mastic. Every job comes with our 12-month guarantee. West Norwood is one of 764 towns and villages in Greater London where we work for external mastic.
Our applicators cover all of SE19, SE27 and SE21 for external mastic and the streets around it. If you need external mastic at a property on Crown Lane, Dover Road and Moore Road or anywhere close by, we can help. Main roads around West Norwood include the A214 and A215. Nearby, we also carry out external mastic in Norwood New Town (1 mile south), Gipsy Hill (1 mile south-east), Upper Norwood (1 mile south-east), West Dulwich (1 mile north-east) and Crystal Palace (1 mile south-east). Further out, we also cover London (5 miles north), City of Westminster (7 miles north), Marylebone (7 miles north), Kensington (7 miles north-west), St Pancras (7 miles north) and Shoreditch (7 miles north).
Landmarks near West Norwood
Locally, jobs take us to homes and businesses close to Long Meadow, Norwood School and Hillcrest, among other places. West Norwood’s nearest station is West Norwood station, roughly 0.5 miles north-west of the centre. Other landmarks nearby include Centrale Croydon (3.5 miles south) and St Christopher's Hospice (1.6 miles east). The countryside around West Norwood includes Dulwich Upper Wood and Battersea Park Lake.