Greater London · England
Crouch End Window Mastic
Mastic around window and door frames, sills and patio doors for homeowners, landlords and businesses in Crouch End. Fully insured, ARBOMaster approved and guaranteed for a year.
- Water coming in at the bottom corners of a door
- A bead that doesn’t match the frame
- Hard, cracked sealant around windows
When something else is needed
We’d rather tell you now than do work that will not last, so here’s what sealant can’t put right:
- Penetrating damp from a failed cavity tray or render
- Rotten timber, which needs a joiner first
- A door that needs adjusting, rehanging or new seals
If you’re not sure, just ring 0345 464 0079 or email us and we’ll give you a straight answer before you book.
Surfaces we seal
- Timber windows & doors
- Aluminium frames
- Composite doors
- Window sills
- uPVC windows
- Patio & French doors
About our window mastic in Crouch End
The mastic around a window or door seals the gap between the frame and the wall. Once that seal fails, wind and rain find the gap. Our applicators cut it out and replace it with a flexible, weatherproof sealant. Typical jobs include untidy mastic left by window fitters and damp patches on the reveal after heavy rain, across uPVC windows, window sills and composite doors.
London homes have every kind of window, from timber sashes in period terraces to aluminium and uPVC in newer blocks. The mastic around them dries out and cracks with age, letting in draughts and water.
Whatever the size of the job, it’s backed by our 12-month guarantee in Crouch End and across Greater London.
- Location
- Crouch End (N8, N19, N4)
- Wider area
- Greater London
- Cover
- One year on every job
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
What we do, step by step
When we arrive, we look over the joints with you first, so there are no surprises. We protect the surfaces around the joints before any work begins. The work normally takes a few hours for a handful of frames, longer for a whole house. In Crouch End, 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.
- We start by checking each window and door with you.
- The old mastic is cut out and the surfaces cleaned back.
- Where gaps are deep, backing rod goes in first.
- We apply a weatherproof sealant to match the frame and tool it neatly.
- We clear up and check every joint is fully closed.
Preparing for the visit
- Mention any parking rules near the property
- Keep pets and children clear of the area while we work
- Move anything stored near the joints
Ask for a quote
To get a quote, phone 0345 464 0079 or email us and tell us where the job is and what the problem looks like. We’ll give you a clear price before any work starts.
Related advice
Work for landlords, hotels and businesses
Hotels need rooms back in use, so the work can be planned room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.
If you manage several properties in or around Crouch End, several properties can be quoted together. Just tell us the addresses and what each one needs, and pictures by email help.
Can I do it myself?
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, and the work is guaranteed for a year.
What we’re called out for in Crouch End
Frames are never completely still. Sun on a frame makes it expand, and it contracts again overnight, while the masonry beside it stays put. A sealant that can’t keep up eventually tears.
It’s worth asking for a quote if you see:
- Damp patches on the reveal after heavy rain
- Cracked sealant at the sill ends
- Black, perished sealant on frames
- Draughts coming in around windows and doors
As a London address, Crouch End can be tricky for parking: let us know about parking bays, permits or a driveway.
What your quote should include
- What the cure time is
- Whether they’re fully insured
- Whether you can choose the colour
- The length of the guarantee
What affects the quote in Crouch End
The quote reflects the job in front of us. We look at:
- Whether the work is at height
- Mould in or behind the old joints
- Which sealant suits the joint
- The size of the job
Every job is a little different, so each one gets its own quote. Size, access and the product the joint needs all play a part.
Asking for a quote
When you contact us, these details help:
- How many joints, rooms or windows are involved
- The problem you’ve noticed
- Any access issues, like height or stairs
- Where the job is, and your postcode
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we’ll explain how we’d tackle it. Whenever you’re ready, call 0345 464 0079 or drop us an email.
Questions from Crouch End
Is parking a problem for a job in Crouch End?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. The visit is then planned around what’s available.
Can you do window mastic in Crouch End?
Yes, Crouch End is within the area we cover. Our work covers London and the South East. Just phone 0345 464 0079 or drop us an email with a few details of the job, and we’ll give you a clear quote.
When is the sealant fully cured?
Many sealants skin over quickly but take longer to cure fully. We will tell you how long to leave the joint before we leave.
Do the sealants smell?
Some sealants have a smell while they cure, which fades as it sets. Opening a window helps.
Is it worth trying it myself?
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 I paint over the new sealant?
It depends on the sealant. Silicone is not paintable, but some hybrid sealants are. Mention any painting plans before any work starts.
Does the work come with a guarantee?
Yes. Every job comes with our 12-month guarantee, and we’re fully insured.
What do you need from me for a quote?
Let us know what needs doing and where, plus pictures if you have them. If we need more, we’ll ask.
Also near Crouch End
More services for Crouch End
Why deal with it now?
Working on frames from a ladder with a sealant gun is not easy, especially on upper floors. We cut out properly, back deep gaps and tool every joint neatly, in a sealant suited to the wall. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in Crouch End, the repair is bigger than a sealant job.
A failed joint rarely gets cheaper to fix by waiting. If you’re not sure whether it needs doing, ring 0345 464 0079 or send us an email for an honest opinion and a quote.
Why Crouch End clients choose us
- Trusted Arbo and Everbuild sealants
- 4.9 on Google from 180+ five-star reviews
- Anti-fungal sanitary silicone in wet areas
- Any old sealant cut out fully, not covered over
Read our cost guide and our reviews.
Windows and doors in Crouch End
Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. In a converted house or block, who looks after the windows depends on the lease, so it’s worth checking before booking.
Homes close to Christ Church include some older properties, and the joint between an old wall and a newer frame is normally the first place rain gets in. For site and facilities teams at buildings such as Rokesly Infant & Nursery School, the mastic around its windows and doors needs looking after like any other building’s.
Crouch End is about 2 miles north-west of Highbury, in Greater London. From the centre of Crouch End to the outskirts, we cover window mastic for every kind of property. Crouch End is one of 764 places in Greater London where we work for window mastic. London is on our list too, about 6 miles from Crouch End.
We work across N8, N19 and N4 for window mastic and the streets around it. We cover properties on New Road, Park Road and Ella Road. Neighbouring places we cover for window mastic include Hornsey (1 mile north-east), Stroud Green (1 mile east), Turnpike Lane (1 mile north-east), Highgate (1 mile south-west) and Upper Holloway (1 mile south). Within a short drive, we also cover London (6 miles south), City of Westminster (5 miles south), Marylebone (4 miles south), Kensington (6 miles south-west), St Pancras (4 miles south) and Shoreditch (4 miles south-east).
Near you in Crouch End
We work in homes and buildings around Asanté Academy of Chinese Medicine, Hornsey School for Girls and Queens pub and the streets around them. The closest station to Crouch End is Crouch Hill station, about 0.7 miles south-east of the centre. Other landmarks nearby include Montfichet's Tower (4.7 miles south) and Hornsey Central Hospital (less than half a mile north-west). The countryside around Crouch End includes Parkland Walk and Darland's Lake.