Greater London · England
Upper Holloway External Mastic
Professional external mastic in and around Upper Holloway, with old sealant always removed completely.
- Failed seals between different materials
- Weeds or debris growing in open joints
- Failed sealant between panels on a façade
External mastic for homes and businesses in Upper Holloway
For buildings in Upper Holloway, we reseal external joints of all kinds, from brick movement joints to cladding panels. Every joint gets the same careful preparation: clean joint faces and the right depth. If you are dealing with sealant pulling away from one side of the joint and panel joints letting water in, we can help, on render & cladding joints, joints between brick and frames and façade panels alike.
Working on the outside of a London home means planning access: shared paths, upper floors and parking. For a home in Upper Holloway, tell us how high the joints are and how to reach the back of the building.
All of our work is guaranteed for twelve months, and the guarantee is the same wherever you are.
- Place
- Upper Holloway (N19, N7, N6)
- Region
- Greater London
- Guarantee
- 12 months on all our work
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Walls and rooflines in Upper Holloway
With historic houses such as Witanhurst (about 0.9 miles west) nearby, there’s older building stock in the area around Upper Holloway as well as newer homes. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material. The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
In the older streets around St Andrew's Whitehall Park, older walls, gutters and the joints where extensions meet them need a flexible sealant. Managing a site like St John's Upper Holloway CofE Primary School? Then movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Upper Holloway is about 2 miles east of Hampstead, in Greater London. Jobs in Upper Holloway get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Upper Holloway is one of 764 places in Greater London where we work for external mastic.
We work across N19, N7 and N6 for external mastic. That includes homes and businesses on Ward Road, Kiver Road and Foxham Road. Main roads around Upper Holloway include the A103, so getting to you is simple. If you’re just outside Upper Holloway, we cover Tufnell Park (1 mile south), Dartmouth Park (1 mile south-west), Highgate (1 mile north-west), Nag's Head (1 mile south-east) and Holloway (1 mile south-east). We also work in nearby towns such as London (5 miles south), City of Westminster (4 miles south), Marylebone (3 miles south), Kensington (5 miles south-west), St Pancras (3 miles south) and Shoreditch (4 miles south-east).
Around Upper Holloway
Typical jobs here are in homes near City of London Academy, Whittington Park and The Mother Red Cap pub. Other local landmarks include Asanté Academy of Chinese Medicine (1.2 miles north-west) and Vaughan Williams Memorial Library (2 miles south). Upper Holloway has its own railway station: Upper Holloway station. Nearby you will also find The Mall Wood Green (2.3 miles north-east) and Royal Northern Hospital (0.5 miles south-east). Green spaces nearby include Dartmouth Park Hill and Parkland Walk.
Places near Upper Holloway
What else we do in Upper Holloway
What sealant work cannot fix
It helps to know what we can’t do too:
- Subsidence or other structural problems
- Loose or hollow render, which needs re-rendering
- Cracking across the wall rather than at a joint
Not sure which it is? You can phone 0345 464 0079 or send us an email and we will tell you honestly.
Joints and surfaces we work on
- Brickwork movement joints
- Joints between brick and frames
- Concrete & block
- Copings & trims
- Render & cladding joints
- Façade panels
Landlord and commercial work in Upper Holloway
From a single let to a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a one-year guarantee.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. We can quote for more than one property at once.
Can I do it myself?
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and does not move well, and getting the depth right matters as much as the look.
How the job changes by surface
Copings and trims
Coping joints that leak let water straight down into the wall. Resealing them is a small job that protects a lot.
Render joints
Rendered walls have joints at beads, openings and changes of material. We reseal them with a flexible exterior sealant that suits the render colour.
Common questions in Upper Holloway
I let a flat near Upper Holloway station. Can you help?
Yes. We work for landlords and agents as well as homeowners. Just call 0345 464 0079 or email us with the address and what needs doing, and we’ll send you a clear quote.
Do you cover Upper Holloway for external mastic?
Yes. We work across London and the South East, and Upper Holloway is part of that. Just ring 0345 464 0079 or email us with a few details of the job.
Will you leave a mess?
No. We protect the surfaces around the joints, and we tidy up before we go.
Can you quote for more than one area?
Of course. Combining jobs makes good use of the visit, so mention them when you ask for a quote.
How much does external mastic cost in Upper Holloway?
Size, access and the old material all affect the cost. Call for a quick quote.
When will the joints need doing again?
That depends on the wall, the weather and the movement. Look for splits, hardening or edges coming away and have them redone then.
Do you take out the old sealant first?
Yes. Sealing over the old bead is the commonest cause of early failure, so we never do it.
Where are you based?
Our base is Crawley. We work across South East England, London and Scotland.
Leave it or put it right?
Done well, a resealed joint is a neat, straight line that suits the wall. A hurried job with smeared edges and no backing looks worse and fails sooner so it’s worth doing right. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in Upper Holloway, the repair is bigger than a sealant job.
Homes and businesses are quoted the same way: the amount of work, the access and the products needed, along with when we can work on site. Ask us for a quote and we will explain what it covers.
Why Upper Holloway clients choose us
- Anti-fungal sanitary silicone in wet areas
- Trusted Arbo and Everbuild sealants
- Tidy, careful work
- More than 20 years in sealant work
Read what affects the cost or our reviews.
The process
Good joint work is mostly preparation, so that’s where we spend the time. Joints are cleaned back and dried before anything new goes in. All told, the work takes anything from a few hours to several days, depending on the building. In Upper Holloway, flats, stairs and shared entrances are part of the routine. If the building has a concierge, managing agent or access rules, tell us when you book.
- Each joint is checked and the colour of the new sealant agreed.
- Failed sealant is removed back to clean, sound faces.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- Primer is applied wherever the sealant needs it.
- We gun in low-modulus sealant and tool it neatly.
How to prepare
- For indoor joints, keep the area dry beforehand if you can
- Clear items away from the joints we are working on
- Mention any tricky access
How to get a quote
Every job is quoted individually, so start by telling us what you need. Just phone 0345 464 0079 or email us with the details.
Related advice
Signs you need external mastic in Upper Holloway
Sunlight, wet weather and frost wear exterior sealant down. 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 when they notice something like this:
- Plants rooting in failed movement joints
- Weathered mastic that no longer stretches
- Panel joints letting water in
- Sealant that has lost its bond to the brick or render
Upper Holloway is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
What your quote should include
- How long the guarantee is
- How the surfaces are prepared before sealing
- Who does the work, and how experienced they are
- Which sealant they’ll use, and why