Greater London · England
External & façade joints in Totteridge, Greater London
Sealing brickwork movement joints, render, cladding and façade joints for homes and businesses in Totteridge and across Greater London. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Joints with sealant missing in places
- Damp patches traced to an open external joint
- Sealant pulling away from one side of the joint
Landlord and commercial work in Totteridge
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.
Housing providers, facilities teams and property managers book us too in Totteridge and across Greater London. Several sites can be quoted together, and we are fully insured.
External mastic in Totteridge, done properly
Failed sealant is cut out, the depth set with closed-cell backing rod, and the joint resealed with a low-modulus sealant made for outside. The colour is chosen to suit the brick or render. If you are dealing with joints pointed up with cement by mistake and moss and dirt in joints with no sealant left, we can help.
Outside work in London starts with access: side passages, upper floors and where to park. In Totteridge, joints up high may need ladders or other access, which is worth talking through when you book.
You get a 12-month guarantee, the same in Totteridge as everywhere else we work.
- Location
- Totteridge (N20, EN5)
- Wider area
- Greater London
- Cover
- A year, on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Keeping the joints in good condition
How long the joints last depends on use and care. We suggest:
- Get split or bare joints resealed while the damage is small
- Clear growth from the base of walls and joints
- Never let anyone fill a movement joint with mortar
- Wash walls gently around the sealant
Make sure anyone working on the wall later knows where the movement joints are. They must stay as flexible joints, never rendered or pointed over.
Gaps, plants or missing sealant in a joint are worth getting looked at. Early work is quicker and leaves a better finish.
What happens if it’s left?
An open joint keeps letting water into the wall with every downpour. In cold weather, frost can damage wet brick and render around the joint, so the problem grows beyond the joint itself. 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.
Every job is a little different, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all make a difference.
What you get with us
- ARBOMaster approved applicator
- Sanitary silicone with an anti-fungal additive in wet areas
- 4.9 on Google from 180+ five-star reviews
- White, clear, grey or coloured to suit, where the product allows
Read what affects the cost and our reviews.
What affects the cost of external mastic
You will get a clear quote before any work starts. It’s based on:
- The product the joint needs
- How many areas need sealing
- How much old sealant there is and how hard it is to remove
- How much there is to do
Leaving a failed joint usually makes the job bigger, not smaller, because water and mould keep working on it. If you are not sure whether it needs doing, phone 0345 464 0079 or send us an email and we’ll give you an honest view and a quote.
Helping us quote
To help us quote quickly, please include:
- The address or postcode of the job
- Pictures of the joints, sent by email
- Any previous sealing or DIY work
- The rough size of the job
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is.
What external mastic looks like in Totteridge
London terraces and converted houses often share gutters, downpipes and walls, so it’s worth agreeing who is responsible before work starts. With historic houses such as Wyllyotts Manor (about 4.2 miles north) nearby, there’s older building stock in the area around Totteridge as well as newer homes. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material.
If you look after a building such as The Totteridge Academy, larger buildings have long runs of movement joint that eventually need resealing. For an older house near a landmark such as St Andrew's Church, an extension built onto an older house moves differently, and the joint between them takes the strain. Rented homes near Oakleigh Park station change hands often, and split movement joints are easy to miss on a rental until damp shows inside.
Totteridge is about 1 mile south-west of Barnet, in Greater London. For external mastic in and around Totteridge, please phone 0345 464 0079 or drop us an email for a quick quote. We are based in Crawley and cover Greater London. Totteridge is one of 764 towns and villages in Greater London we cover for external mastic. You can also see our page for London, about 10 miles away.
Jobs for external mastic in N20 and EN5 works the same way as everywhere else we cover. Whether your property is on Barnet Lane, Grange Avenue and Chestnut Lane or a nearby road, we can help. We also cover the places around Totteridge: Hadley (1 mile north), High Barnet (1 mile north), Arkley (2 miles north-west), Mill Hill (2 miles south-west) and Rowley Green (2 miles north-west). We also work in nearby towns such as London (10 miles south-east), City of Westminster (9 miles south), Marylebone (8 miles south), Kensington (9 miles south), St Pancras (8 miles south-east) and Shoreditch (9 miles south-east).
What’s near Totteridge
Typical jobs here are in homes near Francis Skaryna Belarusian Library and Museum, Susi Earnshaw Theatre School and Brook Farm Open Space, among other places. The nearest railway station is Oakleigh Park station, roughly 1.5 miles east. A little further out are Francis Skaryna Belarusian Library and Museum (1.5 miles south-east) and Barnet General Hospital (1.3 miles north-west). Green spaces nearby include Totteridge Green and Darland's Lake.
How the job changes by surface
Brickwork movement joints
Brick moves with heat and moisture, and grows a little over time. That movement goes into the joint, so the sealant in it must stay soft and stretchy.
Render joints
Water behind render can lead to blown patches. A sound joint keeps the render dry behind and protects the render itself.
Nearby places to Totteridge
Also in Totteridge
Can I do it myself?
If you’re set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it doesn’t work out, we can still put it right.
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
What happens on the day
All our tools and materials come with us in the van, so you don’t need to buy or prepare anything. After a quick look at the joints together, we protect the area and start. Most jobs take a few hours for a handful of joints, longer for a whole elevation. In Totteridge, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- Each joint is checked and the colour of the new sealant agreed.
- Failed sealant is removed back to clean, sound faces.
- Backing rod goes in so the sealant can stretch between the two faces.
- Primer is applied wherever the sealant needs it.
- We gun in low-modulus sealant and tool it neatly.
How to prepare
- Let us know about parking restrictions
- For indoor joints, keep the area dry beforehand if you can
- Mention any tricky access
Getting a quote
Asking for a quote is easy: let us know what needs doing and where. Photos by email help us understand the job, and we’ll take it from there.
Related advice
Your questions about external mastic in Totteridge
Can you help a landlord with a rental near Oakleigh Park station?
Yes, landlords and agents are among the people we work for. Just phone 0345 464 0079 or email us with the address and what needs doing, and we will give you a clear price.
Is Totteridge in your area for external mastic?
Yes. We work across London and the South East, and Totteridge is part of that. Just phone 0345 464 0079 or send us an email with a few details of the job, and we will give you a clear price.
How much does external mastic cost in Totteridge?
Size, access and the old material all affect the cost. Call for a quick quote.
Is there a guarantee?
Yes: twelve months. If there’s a problem with our work in that time, tell us and we will put it right.
How long does external mastic take?
A typical job takes a few hours for a handful of joints, longer for a whole elevation, including the preparation. Your quote will say how long we expect yours to take.
Should I try DIY first?
You can, for simple jobs. Preparation is everything: all the old sealant out, and a clean, dry joint. If it does not work out, we can redo it.
Do you take out the old sealant first?
Yes, always, and completely. New sealant will not bond properly to old, so any old material comes out before anything new goes in.
Does someone need to be in?
Access is agreed with you when the job is booked. For inside work, that normally means someone being in.