Greater London · England
Monken Hadley External Mastic
External mastic in Monken Hadley from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Sealant that has lost its bond to the brick or render
- Brick movement joints where the sealant has split
- Failed seals between different materials
Your questions about external mastic in Monken Hadley
Can parking be tricky for a visit in Monken Hadley?
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 Hadley Wood station?
Yes, landlords and agents are among the people we work for. Just ring 0345 464 0079 or send us an email with the address and what needs doing, and we will send you a clear quote.
Can you match the colour of my brickwork?
We choose a sealant colour to suit the brick, stone or render. There’s a wide choice of exterior colours.
Is the work guaranteed?
Yes. Each job is guaranteed for twelve months, large or small.
Can you do several jobs on one visit?
Yes, and it often makes sense. Doing several areas at once is normally more efficient.
Can you reach joints on upper floors?
That depends on the building and the joints. Where joints can be reached safely, we’ll do them. Tell us about the building and we will confirm what access is needed.
How long does external mastic last?
That varies with the weather the wall faces, how much it moves and the sealant used. Treat it as a maintenance item and look at it yearly.
Is it worth trying it myself?
It depends on the job. 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.
External mastic in Monken Hadley, done properly
A movement joint is only as good as its depth. Backing rod controls how deep the sealant goes and keeps it off the back of the joint, so it bonds to the two sides only and can stretch. We work on joints between brick and frames, brickwork movement joints and concrete & block, and people most often call us about joints pointed up with cement by mistake and failed seals between different materials.
Modern London flats rely on sealed movement joints and cladding joints. Period houses have different weak points, such as gutter joints, trims and the line where an extension meets the old wall.
Our work is backed for twelve months, in Monken Hadley and everywhere else we cover.
- Location
- Monken Hadley (EN5, EN4)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Why deal with it now?
It often makes sense to reseal all the failing joints on an elevation together. They’ve weathered the same way. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and by the time it shows on a wall or ceiling in Monken Hadley, the repair is bigger than the sealant job would have been.
A failed joint rarely gets cheaper to fix by waiting, because water and mould keep working on it. If you’re not sure whether it needs doing, phone 0345 464 0079 or send us an email and we will give you an honest view and a quote.
Why Monken Hadley customers choose us
- 20+ years of sealant experience
- Homes, businesses and hotels
- We agree the colour with you first
- Every job guaranteed for a year
Read our cost guide or what customers say.
What happens on the day
There’s no need to move everything out before we come, just the space around the work. Everything nearby is protected, and the work takes a few hours for a handful of joints, longer for a whole elevation in most cases. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. If the building has a concierge, managing agent or access rules, tell us when you book.
- 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.
Preparing for the visit
- Try not to wet indoor joints just before the visit
- Let us know about stairs, lifts or work at height
- Let us know if you’ve seen damp or leaks
Ask for a quote
We don’t publish a price list. Instead, your job gets its own clear quote. To arrange one, ring 0345 464 0079 or drop us an email.
Read more
How to look after the new joints
To keep the joints looking good and working properly:
- Tell anyone working on the walls about the movement joints
- Keep high-pressure jets off the joints
- Keep soil, plants and ivy away from the joints
- Check external joints each spring
Have a quick look at the joints each spring. Splits, gaps at the edges or plants in the joint are early warning signs.
A joint that has stopped moving pushes the movement elsewhere, generally as cracking in the brickwork or render nearby. Catch it early and you reduce the risk.
What we are called out for in Monken Hadley
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.
It’s worth asking for a quote if you see:
- Weathered mastic that no longer stretches
- Movement joints filled with mortar instead of sealant
- Gaps where render, brick and frames meet
- Plants rooting in failed movement joints
As a London address, Monken Hadley can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Before booking anyone
- What happens if the job turns out different
- What guarantee comes with the work
- Is VAT in the price?
- Who turns up on the day
Nearby places to Monken Hadley
What else we do in Monken Hadley
Surface by surface
Cladding and façade panels
Panels heat up and cool down quickly, so the joints work hard every day. We choose the product to suit.
Render joints
Rendered walls have joints at beads, openings and changes of material. They’re resealed in a sealant that suits the render.
What affects the quote in Monken Hadley
Every job gets its own quote. These are the things that affect it:
- The number of rooms or windows
- Whether the work is at height
- The product the joint needs
- Any mould that needs treating
A few things move the cost up or down: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether the work is at height. Your quote takes all of that into account.
What we need to know
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- How we’d reach the joints
- The type of property
- Any previous sealing or DIY work
- The rough size of the job
Every job is quoted individually. Just phone 0345 464 0079 or email us with the details and send pictures if you have them.
What external mastic looks like in Monken Hadley
In terraces and conversions, gutters and walls are often shared with the neighbours, so check who is responsible for the outside before booking. Historic houses like Wyllyotts Manor (about 2.4 miles north) are a reminder that the area around Monken Hadley 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.
Letting a property close to Hadley Wood station? Then failed wall and movement joints let damp in, so they’re worth checking between tenancies. In the older streets around Parish Church of St Mary the Virgin, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Monken Hadley is about 1 mile north-west of Barnet, in Greater London. Our applicators cover external mastic for homes and businesses in Monken Hadley and the surrounding area. 764 places in Greater London are on our list, from the larger towns to small villages. We also work in London, about 12 miles from Monken Hadley.
Work in EN5 and EN4 works the same way as everywhere else we cover. Whether your property is on Dury Road, Lucan Road and Bruce Road or anywhere close by, our applicators can take on the job. With the A1081 close by, Monken Hadley is simple for us to get to for external mastic. Close by, we work in Underhill (1 mile south), Hadley Wood (1 mile east), Barnet (1 mile south-east), Bentley Heath (1 mile north) and New Barnet (2 miles south-east). Further out, we also cover London (12 miles south), City of Westminster (10 miles south), Marylebone (10 miles south), Kensington (11 miles south), St Pancras (10 miles south) and Shoreditch (11 miles south-east).
Around Monken Hadley
Around Monken Hadley, our work takes us to homes and buildings near Queen Elizabeth's Girls' School, Susi Earnshaw Theatre School and King George's Fields (Monken Hadley) and the streets around them. For rail, the closest station is Hadley Wood station, about 1 mile north-east of the centre. Nearby you will also find Barnet General Hospital (1 mile south-west) and Spires Shopping Centre (0.5 miles south). Green spaces nearby include Hadley Green and Darland's Lake.
Landlord and commercial work in Monken Hadley
Mouldy or split sealant often shows up at the end of a tenancy. Several properties can be quoted together.
For anyone letting property in or around Monken Hadley, jobs at different addresses can be quoted together. Send us the addresses and the work at each, and pictures by email help.