Greater London · England
Window Mastic in Upper Holloway
Window and door frames in Upper Holloway need attention? We cut out the old, prepare the joints and apply the right sealant, with a 12-month guarantee.
- Gaps between the frame and the inside reveal
- Sealant in the wrong colour for the frame
- Black, perished sealant on frames
What happens if it’s left?
Getting a straight, even bead on an outside frame takes practice, especially upstairs. We cut out properly, back deep gaps and tool every joint neatly, using a product chosen for the frame and wall. 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 Upper Holloway, the repair is bigger than the sealant job would have been.
Leaving a failed joint normally makes the job bigger, not smaller, as water and mould keep getting in. If you’re unsure, phone 0345 464 0079 or drop us an email and we’ll give you an honest view and a quote.
What you get with us
- Over 20 years’ experience
- Trusted Arbo and Everbuild sealants
- Domestic, commercial and hotel work
- We never seal over old sealant
Take a look at our cost guide or customer reviews.
About our window mastic in Upper Holloway
Some gaps around frames are far deeper than they look. Packing it solid with sealant gives a joint that can’t flex, so deep gaps get backing rod first. That way the new bead bonds to the frame and the wall only. Typical jobs include a bead that doesn’t match the frame and hard, cracked sealant around windows, on uPVC windows, composite doors and aluminium frames.
From mansion-block windows to modern glazing in new flats, London has every kind of frame. Over the years, the sealant around them shrinks, cracks and pulls away, letting in draughts and water.
Your job is guaranteed for a year, as with all our work.
- Location
- Upper Holloway (N19, N7, N6)
- Wider area
- Greater London
- Guarantee
- One year on every job
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Honest limits
We will not take on work that won’t last, so here’s what sealant cannot put right:
- A frame that has rotted at the joint
- Misting between the panes of a double-glazed unit (that needs a new unit)
- Penetrating damp from a failed cavity tray or render
If you’re not sure, just call 0345 464 0079 or drop us an email and we’ll give you a straight answer before you book.
Where we work in Upper Holloway
- Composite doors
- Window sills
- uPVC windows
- Timber windows & doors
- Patio & French doors
- Aluminium frames
Surface by surface
Aluminium frames
Metal frames expand in the sun and are often slim, with little room for error. A tidy bead in anthracite grey, black or a matching colour keeps the clean look.
Composite doors
A composite door usually sits in a plastic outer frame, and the joint around it is sealed like a window. We match the colour to the frame.
Towns and villages near Upper Holloway
What else we do in Upper Holloway
FAQs for Upper Holloway
Do you cover Upper Holloway for window mastic?
Yes, Upper Holloway is within the area we cover. We work across London and the South East. You can ring 0345 464 0079 or send us an email and tell us what needs doing, and we’ll send you a clear quote.
Do you work for landlords with property near Upper Holloway station?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. You can phone 0345 464 0079 or send us an email with the details for a clear quote.
Can I do it myself?
Sometimes. Preparation is everything: all the old sealant out, and a clean, dry joint. We can always put it right if it fails.
Can you seal over the old sealant?
No, it won’t last. It can look neat for a few weeks, but the new layer lifts away from the old one. The old sealant has to come out completely.
What sealant do you use?
Quality sealants from brands including Arbo and Everbuild, picked for each joint. We explain the product when we quote.
Where do you work from?
We’re based in Crawley, West Sussex, and we work across South East England, London and Scotland.
Do you seal inside as well as outside?
Yes. Outside is the weather seal; inside closes the gap to the plaster. We do one or both.
Do you have sealant for grey or black windows?
Yes, we choose a colour to suit the frame. Grey and black frames get grey or black sealant, and wood-effect frames usually suit brown.
How we quote for window mastic
There’s no set price list, because no two jobs are the same. What we look at:
- How easy the joints are to reach
- Working hours on commercial sites
- How many rooms, windows or areas are involved
- Any mould that needs treating
Every job is a little different, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all make a difference.
What to tell us for a quote
Before you ask for a quote, have a think about:
- Where the property is
- A few photos by email, if you can
- The rough size of the job
- Any access issues, like height or stairs
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we’ll explain how we’d tackle it. Whenever you are ready, call 0345 464 0079 or send us an email.
What we are called out for in Upper Holloway
A lot of older mastic was never designed to stay flexible. Once it’s rigid, every bit of frame movement pulls at it, leaving a hairline gap down one side.
Keep an eye out for these signs:
- Water coming in at the bottom corners of a door
- Rushed sealant from a window installation
- Sealant in the wrong colour for the frame
- Old mastic that has gone black or come away
For site and facilities teams at buildings such as St John's Upper Holloway CofE Primary School, its window and door frames need their mastic kept sound, just like a home’s.
What to look for in a quote
- How hidden problems are handled
- Whether you can choose the colour
- Is the old sealant removed completely?
- Who turns up on the day
What we do, step by step
There’s no need to move everything out, just the space around the work. We protect the rest, and the work takes a few hours for a few frames, or a day or more for a whole house for a typical job. For a job in Upper Holloway, parking and access are the things to plan: tell us about permits, visitor bays or off-street space, which floor we’re working on and whether there’s a lift.
- First, we go round the frames with you and agree the list.
- The old mastic is cut out and scraped back to clean surfaces.
- Deep gaps get closed-cell backing rod to set the depth.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- We tool each bead neatly and check every joint is closed.
Preparing for the visit
- For business premises, tell us about site rules or sign-in
- For indoor joints, keep the area dry beforehand if you can
- Let us know about earlier repairs to the joints
How to get a quote
Getting a quote is simple: tell us what needs doing and where and its rough size. Photos by email help us understand the job, and we will come back to you with a quote.
Read more
Frames and glazing around Upper Holloway
Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. In London conversions and blocks, the lease decides who is responsible for the frames, so it’s worth checking before booking.
In the older streets around St Andrew's Whitehall Park, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. Rented homes near Upper Holloway station change hands often, and sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Upper Holloway is about 2 miles east of Hampstead, in Greater London. If you need window mastic in Upper Holloway, it’s easy to get a quote: please call 0345 464 0079 or send us an email. We cover Greater London from our Crawley base. Across Greater London, we cover 764 places, and Upper Holloway is one of them.
Our applicators cover all of the N19, N7 and N6 postcode area for window mastic. We cover properties on Ward Road, Kiver Road and Foxham Road. With the A103 close by, Upper Holloway is simple for us to get to for window mastic. Other places close to Upper Holloway include 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). Within a short drive, we also cover 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).
Local landmarks in Upper Holloway
In Upper Holloway, that means homes and buildings near City of London Academy, Whittington Park and The Mother Red Cap pub, among other places. Nearby too are 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. A little further out are The Mall Wood Green (2.3 miles north-east) and Royal Northern Hospital (0.5 miles south-east). The countryside around Upper Holloway includes Dartmouth Park Hill and Parkland Walk.
DIY versus a professional finish
A DIY attempt does not rule out a professional job. We remove it and do the joint properly, so just mention it when you contact us.
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.