Greater London · England
Window & door mastic in Arnos Grove, Greater London
Window mastic in Arnos Grove from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Cracked internal joints between frame and plaster
- Untidy mastic left by window fitters
- Rain getting in at the frame or under the sill
About our window mastic in Arnos Grove
Homes in Arnos Grove have every kind of window: from uPVC casements to timber and aluminium, along with patio doors, French doors and sills. The sealant is chosen to suit the frame material and the wall. Typical jobs include cracked or shrunken mastic around the frame and gaps between the frame and the inside reveal, across window sills, composite doors and uPVC windows.
London’s Victorian and Edwardian terraces were built with timber sash windows, and many still have them or their replacements. Either way, the mastic between frame and brickwork is what stops draughts and rain getting in.
The work is guaranteed for twelve months. If there’s a problem with our work within the year, let us know and we’ll sort it.
- Place
- Arnos Grove (N11, N14, N13)
- Region
- Greater London
- Cover
- One year on every job
- Quotes
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
DIY versus a professional finish
If you’ve already had a go yourself, that is fine. We remove it and do the joint properly.
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
Frames and glazing around Arnos Grove
London and the South East are among the drier parts of the UK, 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.
Managing a site like Bowes Primary School? Then its window and door frames need their mastic kept sound, just like a home’s. If you let a flat or house near New Southgate station, renewing tired window mastic between tenants heads off draught and damp complaints.
Arnos Grove is about 3 miles north-east of Finchley, in Greater London. Every kind of property in Arnos Grove can book us for window mastic. The work is guaranteed for a year. Our Greater London coverage runs to 764 places, Arnos Grove among them. Our London page covers work nearby, about 8 miles away.
We cover every part of N11, N14 and N13 for window mastic. If you need window mastic at a property on Oak Lane, High Road and York Road or a nearby road, we can help. Main roads around Arnos Grove include the A109 and A1004, which makes travel easy. Other places close to Arnos Grove include New Southgate (1 mile west), Bounds Green (1 mile south), Southgate (1 mile north), Palmers Green (1 mile east) and Oakthorpe Park (1 mile east). Further out, we also cover London (8 miles south), City of Westminster (7 miles south), Marylebone (7 miles south), Kensington (9 miles south), St Pancras (6 miles south) and Shoreditch (7 miles south).
What’s near Arnos Grove
Around Arnos Grove, our work takes us to homes and buildings near The Ranelagh pub, Broomfield School and Broomfield Park, among other places. For rail, the closest station is New Southgate station, roughly 0.6 miles west of the centre. A little further out are Broomfield House Museum (0.5 miles east) and The Mall Wood Green (1.7 miles south-east). Green spaces nearby include Highgate Hill and Darland's Lake.
Common problems we fix in Arnos Grove
On timber frames, paint and putty build up around the joint. Old mastic gets painted over and cracks under the paint, and the wood moves with damp as well as heat.
People usually contact us after spotting something like this:
- Gaps between the frame and the inside reveal
- Cracked or shrunken mastic around the frame
- Cracked sealant at the sill ends
- Gaps left after new windows were fitted
Homes close to Syro-Malabar Catholic Church of London include some older properties, and replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Questions to ask before you book
- How the colour is chosen
- What preparation is included
- Which sealant they’ll use, and why
- Whether they seal over old material or remove it
Different surfaces, different methods
Window sills
Masonry sills can have joints where water gets in, and the joint under the frame can let rain run behind. Those are sealed with a product suited to stone or concrete.
Timber windows & doors
Wood swells when it’s wet and shrinks when it dries, so the joint must stay flexible. We seal onto sound, dry paintwork or timber.
What we do, step by step
Good joint work is mostly preparation, and we do not rush it. Joints are cleaned back and dried before anything new goes in. All told, the work takes a few hours for a few frames, or a day or more for a whole house. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Arnos Grove. A visitor permit or a nearby bay makes the visit run more smoothly.
- First we look at every frame and agree the list.
- The old mastic is cut out and the surfaces cleaned back.
- Deep gaps are filled with backing rod to set the depth.
- A flexible, weatherproof sealant is applied in a colour to suit the frame.
- Every joint is checked before we leave.
How to prepare
- Keep children and pets away from the work area
- Where the joints are inside, avoid wetting them before we arrive
- Let us know about stairs, lifts or work at height
Get a quote
For window mastic in Arnos Grove, ring 0345 464 0079 or send us an email. A short description of the job and where it is helps us quote, and we will agree the price before any work begins.
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Aftercare tips
A little care helps the new joints last. We recommend:
- Keep timber frames painted
- Do not paint over the silicone
- Look round the frames every year or so
- Don’t use solvent cleaners on the joint
On timber frames, keep the paintwork in good order, since wood that gets wet swells and shrinks more. Keep paint off the silicone itself.
Look out for the warning signs: split or missing mastic, gaps, damp patches inside or black mould on the reveal. Any of these is worth a call.
Common questions in Arnos Grove
Is parking a problem for a job in Arnos Grove?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. The visit is then planned around what’s available.
I let a flat near New Southgate station. Can you help?
Yes. We work for landlords and letting agents as well as householders, and several properties can be quoted together. Just call 0345 464 0079 or email us with the address and what needs doing, and we’ll give you a clear quote.
Can you do upstairs windows?
Normally, yes. We plan safe access before the job.
How do I get a quote for window mastic in Arnos Grove?
Size, access and the old material all affect the cost. Call for a quick quote and we will talk you through it.
Do I need to be at home?
Access is agreed with you when the job is booked. Indoors, that generally means someone at home.
Will the old sealant be removed?
Yes. We cut out all the old sealant and clean the joint.
Where is Mr Mastic based?
We are a Crawley-based firm. We work across South East England, London and Scotland.
Will resealing my frames help with draughts?
Yes, where the draught is at the frame edge. We find where the air is coming from before we reseal.
What happens if it’s left?
Getting a straight, even bead on an outside frame takes practice, especially on upper floors. 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 Arnos Grove, the repair is bigger than the sealant job would have been.
What you pay reflects the work, not a rough estimate. That is why we ask about the job first and agree the price before starting.
Why Arnos Grove customers choose us
- A 12-month guarantee on all work
- 20+ years of sealant experience
- Sanitary silicone with an anti-fungal additive in wet areas
- A choice of colours where the product allows
Take a look at what affects the cost or our reviews.
Nearby places to Arnos Grove
Other services in Arnos Grove
Work for landlords, hotels and businesses
Failed sealant is one of the commonest items on a check-out report, and it’s quick to put right between tenancies. We can quote for more than one property at once.
We also work for property managers and facilities teams in Arnos Grove and across Greater London. We can quote a run of properties together, and we are fully insured.