Greater London · England
Newyears Green Window Mastic
Professional window mastic in and around Newyears Green, with every bit of old sealant taken out first and a 12-month guarantee.
- Leaking joints at the ends of sills
- White mastic on grey or black frames
- Draughty joints inside around the window
Window mastic in Newyears Green
Whether it’s one leaking patio door or every frame on the house, you’ll get a clear quote before any work starts. Just phone 07833 053749 or send us an email and tell us how many frames there are and how they’re reached. We’re often asked to deal with leaking joints at the ends of sills and gaps left after new windows were fitted, on aluminium frames, patio & French doors and window sills. Some people call us the mastic man, others the silicone man or the sealant specialist, but the work in Newyears Green is the same: proper preparation and the right sealant for every joint.
Much of London’s older housing was built with timber sash windows, some still in place and some long since replaced. Whatever is in the opening now, the joint between frame and wall is what keeps the weather out, in Newyears Green as anywhere.
There’s a 12-month guarantee on every job, whatever its size.
- Where
- Newyears Green (UB9)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Quote
- A clear quote up front
- Telephone
- 07833 053749
- Updated
- 26 October 2026
Work for landlords, hotels and businesses
Whether it’s one flat or a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. We can quote for more than one property at once.
Places near Newyears Green
Other services in Newyears Green
Leave it or put it right?
Choosing the product is half the job. Decorators’ caulk and bathroom silicone aren’t designed for outside joints that move. An exterior, low-modulus sealant stays flexible in sun and frost. In London conversions, one flat’s bathroom is often above another flat’s ceiling, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Putting it right early is much less trouble for homes in Newyears Green.
The cost reflects the work involved, not guesswork. That is why we ask about the job first.
Why Newyears Green customers choose us
- We leave the area clean and tidy
- Colour agreed with you before work begins
- 4.9 on Google from 180+ five-star reviews
- Experience in homes, commercial sites and hotels
See what affects the cost or our reviews.
Window mastic in Newyears Green: local notes
Historic houses like Ickenham Hall (about 1.5 miles south-east) are a reminder that the area around Newyears Green has older buildings as well as new. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window. In a converted house or block, who looks after the windows depends on the lease, so check that before booking.
Ickenham Hall, about 1.5 miles south-east, is one of the historic houses in the wider area around Newyears Green, and older homes nearby need a sealant that suits their walls. Letting a property close to West Ruislip station? Then sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Newyears Green is about 2 miles west of Ruislip, in Greater London. Newyears Green gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a one-year guarantee. Our Greater London coverage runs to 786 places, and Newyears Green is one of them.
We cover every part of UB9 for window mastic. If you’re just outside Newyears Green, we cover South Harefield (1 mile north-west), Ickenham (2 miles south), Denham (2 miles south-west), Ruislip Manor (2 miles east) and Ruislip (2 miles east). We also work in nearby towns such as City of Westminster (14 miles east), Marylebone (14 miles east), Kensington (12 miles south-east), St Pancras (15 miles east), Hampstead (12 miles east) and Brompton (14 miles south-east).
Near you in Newyears Green
We work in homes and buildings around Breakspear Arms, Vyners School and Church Field Gardens, among other places. The closest station to Newyears Green is West Ruislip station, roughly 1.2 miles south-east of the centre. Other landmarks nearby include The Chimes (2.6 miles south) and Hillingdon Museum and Archives Services (2.7 miles south). For a walk, there’s Northala Fields and Dews Farm Sand Pits.
Common questions in Newyears Green
I let a flat near West Ruislip station. Can you help?
Yes, rental work is part of what we do. Just call 07833 053749 or email us and tell us about the property, and we’ll give you a clear price.
Is parking an issue for window mastic in Newyears Green?
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.
Do you guarantee window mastic?
Yes. Our 12-month guarantee covers every job.
Can I add another job to the visit?
Yes. More than one area can be quoted together.
Do you seal inside as well as outside?
Yes. Indoors, we seal between the frame and the plaster or reveal.
Do you work on first-floor windows?
Yes, as long as they can be reached safely. Let us know about access when you ask for a quote and we will plan for it.
Where is Mr Mastic based?
We work from Crawley. We cover Newyears Green and the rest of Greater London, along with the rest of our area.
When is the sealant fully cured?
That depends on the sealant used, so follow the cure time we give you.
When to call us in Newyears Green
A lot of older mastic was never designed to stay flexible. Once it has hardened, the frame’s movement tears it from the wall, leaving a hairline gap down one side.
Common reasons people contact us are:
- Cracked internal joints between frame and plaster
- Cracked or shrunken mastic around the frame
- Damp patches on the reveal after heavy rain
- A bead that does not match the frame
Newyears Green is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Before booking anyone
- How much experience the applicator has
- What guarantee comes with the work
- Whether all the old sealant comes out first
- Whether you can choose the colour
What affects the quote in Newyears Green
Every job gets its own quote. These are the things that affect it:
- Which sealant suits the joint
- How many areas need sealing
- Whether the work is at height
- When we can work, for business premises
Rather than a set price list, we price the job in front of us: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
Asking for a quote
When you contact us, these details help:
- Any access issues, like height or stairs
- A few photos by email, if you can
- Any previous sealing or DIY work
- The type of property
For window mastic in Newyears Green, call 07833 053749 or drop us an email. Tell us what the problem is and where, and we’ll agree the price before any work begins.
Surface by surface
Composite doors
An exposed front door gets wind-driven rain, and the top and bottom corners tend to fail first. We pay most attention there.
uPVC windows
Plastic frames move a lot between a hot afternoon and a cold night, so we use a flexible, low-modulus sealant. We match white, brown, anthracite grey and black frames.
Looking after it afterwards
So the new joints stay in good condition:
- Ventilate rooms so frames do not stay wet inside
- Don’t use solvent cleaners on the joint
- Keep paint off silicone joints
- Avoid blasting the frames with a pressure washer
Wipe the frames with soapy water when you clean the windows, and keep solvents and harsh chemicals off the joint.
Water gets in quietly when mastic fails. Often the first sign is a damp patch inside or flaking paint on the reveal. Catching it early keeps the fix to a reseal.
The process
On the day, we look over the joints with you first, so there are no surprises. We protect the surfaces around the joints before any work starts. The work generally takes a few hours for a handful of frames, longer for a whole house. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. Mention any building rules, key holders or managing agents when you book.
- First we look at every frame and agree the list.
- We remove the old mastic and clean the frame and the wall.
- Where gaps are deep, backing rod goes in first.
- New exterior sealant goes on in a matching colour and is tooled smooth.
- Every joint is checked before we leave.
Preparing for the visit
- Let us know if you’ve seen damp or leaks
- Keep children and pets away from the work area
- For indoor joints, keep the area dry beforehand if you can
Getting a quote
For a quote, phone 07833 053749 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.