Greater London · England
Window & door mastic in Northwick Park, Greater London
Mastic around window and door frames, sills and patio doors for householders, landlords and businesses in Northwick Park. Fully insured, ARBOMaster approved and guaranteed for a year.
- Water coming in at the bottom corners of a door
- Black, perished sealant on frames
- A bead that does not match the frame
What window mastic looks like in Northwick Park
In London conversions and blocks, the lease decides who is responsible for the frames, so it’s worth checking before booking. Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Letting a property close to Kenton station? Then cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets. Schools such as Harrow High School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s.
Northwick Park is about 1 mile south-west of Kenton, in Greater London. Whether you’re in the middle of Northwick Park or further out, window mastic is available for homes and businesses alike, from flats and houses to offices and hotels. Across Greater London, we cover 764 places, and Northwick Park is one of them. There’s also a page for London, about 11 miles away.
Jobs for window mastic in HA1, HA3 and HA0 is quoted and booked the same way as anywhere else. Streets in the area include Lyon Road, Manor Road and Gayton Road, and we cover them all. Main roads around Northwick Park include the A404, which makes travel easy. Nearby, we also carry out window mastic in Greenhill (1 mile north-west), Harrow on the Hill (1 mile south-west), South Kenton (1 mile east), Kenton (1 mile north-east) and Harrow (1 mile west). Within a short drive, we also cover London (11 miles south-east), City of Westminster (9 miles south-east), Marylebone (9 miles south-east), Kensington (7 miles south-east), St Pancras (10 miles east) and Shoreditch (11 miles east).
Landmarks near Northwick Park
Typical jobs here are in homes near St Anselm's Catholic Primary School, Orley Farm School and Preston Park and the streets around them. Northwick Park’s nearest station is Kenton station, roughly 0.6 miles north-east of the centre. Other landmarks nearby include Northwick Park Hospital (within half a mile north-east) and Kodak Museum (1.5 miles north-west). Open spaces near Northwick Park include Masons Field and Northala Fields.
About our window mastic in Northwick Park
Over two decades of sealing frames has taught us which products suit which walls. We are fully insured ARBOMaster approved applicators, and we give a 12-month guarantee on the work. Typical jobs include cracked sealant at the sill ends and mastic that has split away from the wall, across uPVC windows, timber windows & doors and window sills.
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.
Big or small, it’s backed by our 12-month guarantee in Northwick Park and across Greater London.
- Place
- Northwick Park (HA1, HA3, HA0)
- Region
- Greater London
- Guarantee
- 12 months on all our work
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
What we’re called out for in Northwick Park
Sun, frost and rain wear sealant out. Sunlight dries the surface out, until it loses its stretch and starts to crack.
People normally contact us after spotting one of these:
- Draughty joints inside around the window
- Gaps where the sill meets the wall
- Old mastic that has gone black or come away
- Hard, cracked sealant around windows
If you live in an older home near Saint Cuthberts Church, the joint between an old wall and a newer frame is usually the first place rain gets in.
What to look for in a quote
- What happens if they find a problem under the old sealant
- Whether the sealant suits the joint
- What guarantee comes with the work
- Is the old sealant removed completely?
Surface by surface
uPVC windows
We clean the frame edge carefully so the plastic isn’t marked, then the new bead is laid against the frame and the wall and tooled smooth.
Composite doors
Draughts round the door leaf normally come from worn seals or adjustment, not the mastic. We seal the frame and let you know about anything else.
The process
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. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Northwick Park. A visitor permit or a nearby bay makes the visit run more smoothly.
- 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.
- Every joint is checked before we leave.
Before we arrive
- Let us know if you’ve seen damp or leaks
- Mention any tricky access
- Mention if the joints have been sealed before
Get a quote
Need a quote? Please phone 0345 464 0079 or drop us an email with a few details. You’ll know what we plan to do, and what it will cost, before any work begins.
Related advice
Work for landlords, hotels and businesses
Hotels need rooms back in use, so we plan the work room by room around your bookings where we can. We have worked in hotels as well as homes and businesses.
Housing providers, facilities teams and property managers book us too. We can quote a run of properties together, and we’re fully insured for the work.
FAQs for Northwick Park
Do you work for landlords with property near Kenton station?
Yes, we work for landlords and letting agents. You can phone 0345 464 0079 or drop us an email with the address and a few details, and we’ll give you a fixed price before any work starts.
Is parking an issue for window mastic in Northwick Park?
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.
Can you get sealant to suit coloured frames?
Yes. Grey and black frames get grey or black sealant, and wood-effect frames normally suit brown.
How long does it take to reseal the windows on a house?
A handful of frames is a short visit. We confirm the timing with your quote.
Do you take out the old sealant first?
Yes. Sealing over the old bead is the commonest cause of early failure, and it’s something we never do.
Are you ARBOMaster approved?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we’re part of it.
Can I add another job to the visit?
Yes, and it often makes sense. Doing several areas at once is generally more efficient.
Where is Mr Mastic based?
Our base is Crawley. We work across South East England, London and Scotland.
When it is not the sealant
To be straight with you, some problems need a different trade:
- Misting between the panes of a double-glazed unit (that needs a new unit)
- A door that needs adjusting, rehanging or new seals
- A sash or casement that will not close properly
If in doubt, call 0345 464 0079 or email us and we will say what we think.
Where we work in Northwick Park
- uPVC windows
- Composite doors
- Aluminium frames
- Timber windows & doors
- Patio & French doors
- Window sills
Quotes for window mastic in Northwick Park
Your quote is based on your job. We take into account:
- How much there is to do
- Mould in or behind the old joints
- Which sealant suits the joint
- Whether old sealant or filler has to be cut out
Rather than a set price list, we look at what your job involves: how many joints, what’s in them now and how we reach them. You’ll know the price before we begin.
Asking for a quote
What to tell us when you ask for a quote:
- A few pictures by email, if you can
- The rough size of the job
- Where the property is
- Whether it has been sealed before
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is, and email pictures if that’s easy.
Leave it or put it right?
Redecorating is a good moment to renew the mastic. A clean new bead makes new paint or render look finished, and it’s easier while the walls are being worked on anyway. In a London flat, a failed joint rarely stays your problem alone: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
A few things move the cost up or down: the old material and how easily it comes out, whether mould needs treating, and whether the work is at height. Your quote takes all of that into account.
Why us?
- Rated 4.9 stars on Google
- Over 20 years’ experience
- Any old sealant cut out fully, not covered over
- We leave the area clean and tidy
Take a look at what affects the cost or our reviews.