Greater London · England
Window & door mastic in Mayfair, Greater London
Specialist window mastic for Mayfair: the right sealant, proper preparation and a neat finish. Call for a quick quote.
- Water coming in at the bottom corners of a door
- Rushed sealant from a window installation
- Mastic that has split away from the wall
Common problems we fix in Mayfair
Water runs down the glass onto the sill, so the sill ends and the joint below the frame are common leak points. Failed sealant there lets rain into the wall or behind the frame.
Look out for any of the following:
- Mastic that’s falling out in pieces
- Water coming in at the bottom corners of a door
- Cracked internal joints between frame and plaster
- Untidy mastic left by window fitters
Homes close to Grosvenor Chapel include some older properties, and the joint between an old wall and a newer frame is usually the first place rain gets in.
Before you book anyone
- What preparation is included
- Is the old sealant removed completely?
- What the cure time is
- Who does the work, and how experienced they are
Window mastic for homes and businesses in Mayfair
Every window and door frame has a gap around it, and mastic is what closes it. When it cracks, hardens or pulls away, draughts and rain get in. The old mastic is removed and the joint resealed with a flexible exterior sealant. If you have old mastic that has gone black or come away and draughty joints inside around the window, we can put it right.
London’s Victorian and Edwardian terraces were built with timber sash windows, and many still have them or their replacements. Whatever is in the opening now, the joint between frame and wall is what keeps the weather out, in Mayfair as anywhere.
The work is guaranteed for twelve months. If there’s a problem with our work within the year, let us know and we will sort it.
- Place
- Mayfair (W1K, W1F, W1U)
- Wider area
- Greater London
- Guarantee
- A year, on every job
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Window mastic in Mayfair: local notes
In a converted house or block, who looks after the windows depends on the lease, so check that before you book. With historic houses such as Handel Hendrix House (about 0.2 miles north) nearby, there’s older building stock in the area around Mayfair as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
Letting a property close to Bond Street station? Then cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets. Mayfair is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Mayfair is about 1 mile south-east of City of Westminster, in Greater London. Every kind of property in Mayfair is covered for window mastic. The work is guaranteed for a year. Mayfair is one of 764 places in Greater London where we work for window mastic.
Every address in W1K, W1F and W1U is within our area for window mastic. If you need window mastic at a property on Park Lane, Bruton Lane and Market Mews or a nearby road, our applicators can take on the job. With the A4201 and A4202 close by, Mayfair is simple for us to get to. Neighbouring places we cover for window mastic include Burlington Estate (1 mile east), City of Westminster (1 mile north-west), Marylebone (1 mile north), St James's (1 mile east) and Chinatown (1 mile east). Further out, we also cover Shoreditch (3 miles east), Walthamstow (7 miles north-east), Hoxton (3 miles north-east), Whitechapel (3 miles east), Hampstead (3 miles north-west) and Ruislip (12 miles west).
What’s near Mayfair
We work in homes and buildings around Royal College of Nursing Library & Museum, Coach and Horses pub and St George's Church of England Primary School. Nearby too are Green Park (0.5 miles south) and The St Marylebone CofE School (0.8 miles north). There’s a railway station in Mayfair itself: Bond Street station. Nearby you will also find Montfichet's Tower (2 miles east) and London Eye Hospital (0.5 miles north). Not far away are Ludgate Hill and St. James's Park Lake.
How the visit works
All our tools and materials come with us in the van, so you don’t need to buy or prepare anything. Once we’ve agreed what’s being done, we protect the area and start. Most jobs take most of a day for a typical house, less for a few frames. In Mayfair, 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 check each frame and agree which ones need doing.
- The old mastic is cut out and the surfaces cleaned back.
- Deep gaps are filled with backing rod to set the depth.
- We apply a weatherproof sealant to match the frame and tool it neatly.
- We clear up and check every joint is fully closed.
Before we arrive
- Tell us about any water getting in
- Mention any parking rules near the property
- Try not to wet indoor joints just before the visit
Getting a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints.
Related advice
More services for Mayfair
What the job involves on each surface
Composite doors
An exposed front door gets wind-driven rain, and the top and bottom corners tend to fail first. Those corners get the most care.
Window sills
The end joints of a sill tend to fail before the rest. We reseal them so rain cannot run into the wall.
Mayfair: your questions answered
Can you help a landlord with a rental near Bond Street station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. You can ring 0345 464 0079 or send us an email with the details for a clear quote.
Is Mayfair in your area for window mastic?
Yes. Our work covers London and the South East, and Mayfair is part of that. Just ring 0345 464 0079 or drop us an email with a few details of the job.
What does window mastic cost?
The cost depends on the size of the job, access and how much old sealant has to come out. Ask us for a quote and we will talk you through it.
Do you take out the old sealant first?
Yes, always, and completely. New sealant will not bond properly to old, so the joint is cleaned back first.
Will there be a smell?
There can be a smell while the sealant cures. Ventilation helps.
How long should I leave it?
That depends on the sealant used, so please follow the time we give you when we finish.
Can new window sealant be painted?
It depends on the sealant. Silicone is not paintable, but some hybrid sealants are. Tell us if you are decorating and we’ll choose accordingly.
Can you do upstairs windows?
Yes, where they can be reached safely. Let us know about access when you ask for a quote and we will plan for it.
Why act early in Mayfair
Once mastic fails, rain can get between the frame and the wall. Over time that can mean damp patches, damaged plaster and rotting timber. A reseal is a much smaller job. Damp from a failed joint spreads quietly in older London brickwork and timber, and once it shows in Mayfair, the repair is bigger than a sealant job.
Combining jobs into one visit normally makes better use of the time than several visits, so tell us about everything that needs sealing. You’ll get one clear quote for the whole job.
Why book with us
- An ARBOMaster approved applicator
- Fully insured
- A choice of colours where the product allows
- 12-month guarantee on every job
Take a look at how sealant jobs are priced or customer reviews.
Keeping the joints in good condition
Good habits help new joints last longer. Our tips:
- Clean frames with a soft cloth and soapy water
- Repaint timber before it’s bare
- Avoid harsh chemicals near the mastic
- Wipe condensation off the frames
Have a look at the joints once a year, ideally after winter. Small splits are simple to catch before they leak, and if anything looks wrong, just call 0345 464 0079 or email us.
Water trapped behind a failed joint can start rot in timber frames and sills. Once wood has rotted, it needs repair before it can be sealed, so early resealing is worth it.
When it isn’t the sealant
It helps to know what we cannot do too:
- Draughts through the window seals rather than the frame
- Damp problems in the wall away from the window
- Rotten timber, which needs a joiner first
If you are not sure, just call 0345 464 0079 or send us an email and we will give you a straight answer.
Where we work in Mayfair
- Aluminium frames
- uPVC windows
- Window sills
- Composite doors
- Patio & French doors
- Timber windows & doors
DIY sealant or a professional job?
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and does not move well, and getting the depth right matters as much as the look.
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.