Greater London · England
Window & door mastic in Headstone, Greater London
Professional window mastic in and around Headstone, with every bit of old sealant taken out first.
- Cold air getting in at the frame edge
- White mastic on grey or black frames
- Water coming in at the bottom corners of a door
Landlords, agents and businesses in Headstone
We work for letting agents and landlords as well as householders. Sealant work between tenants keeps a property looking cared for.
Whether it’s one flat or a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a one-year guarantee.
Window mastic in Headstone, done properly
Homes in Headstone have every kind of window: from uPVC casements to timber and aluminium, plus patio doors, French doors and sills. Each gets a sealant chosen for the frame and the wall it meets. If you have cracked sealant at the sill ends and black, perished sealant on frames, we can put it right, whatever the surface.
From mansion-block windows to modern glazing in new flats, London has every kind of frame. The mastic around them dries out and cracks with age, which is when draughts and damp patches appear in homes in Headstone.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we will sort it.
- Where
- Headstone (HA5, HA3, HA2)
- Wider area
- Greater London
- Cover
- A year, on every job
- Quotes
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
What happens on the day
Most of a good job is in the preparation, and we don’t rush it. Every joint is cleaned and dried before new material goes in. All told, the work takes most of a day for a typical house, less for a few frames. In Headstone, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- We check how each frame can be reached safely.
- Old, cracked mastic is removed completely, along with any loose debris.
- The surfaces are cleaned and left dry.
- Backing rod fills deep voids and the sealant goes in on top.
- We tool the joint so water runs off, then clear up.
How to prepare
- Try not to wet indoor joints just before the visit
- Mention any sign-in or site rules at work premises
- Tell us about any previous sealing or DIY attempts
Ask for a quote
We quote each job on its own, so the first step is telling us about yours. Simply ring 0345 464 0079 or drop us an email and describe the job, and pictures are welcome.
Related advice
Also near Headstone
Also in Headstone
Frames and glazing around Headstone
Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. In London conversions and blocks, the lease decides who is responsible for the frames, so check that before you book.
As a London address, Headstone can be tricky for parking: tell us about permits, visitor bays or off-street space when you book. Letting a property close to Headstone Lane station? Then renewing tired window mastic between tenants heads off draught and damp complaints.
Headstone is about 1 mile east of Hatch End, in Greater London. From the centre of Headstone to the outskirts, we cover window mastic for every kind of property. 764 places in Greater London are on our list, from the larger towns to small villages. There’s also a page for London, roughly 14 miles from Headstone.
Jobs for window mastic in HA5, HA3 and HA2 works the same way as everywhere else we cover. We cover properties on Anselm Road, Ufford Road and Chantry Road. If you are just outside Headstone, we cover Hatch End (1 mile west), Harrow Weald (1 mile east), South Oxhey (2 miles north-west), Belmont (2 miles east) and Carpenders Park (2 miles north-west). Larger places within reach include London (14 miles south-east), City of Westminster (11 miles south-east), Marylebone (11 miles south-east), Kensington (10 miles south-east), St Pancras (12 miles south-east) and Shoreditch (13 miles south-east).
Around Headstone
We work in homes and buildings around The Moon & Sixpence pub, Hatch End High School and Headstone Manor Recreation Ground and the streets around them. There’s a railway station in Headstone itself: Headstone Lane station. Other landmarks nearby include Hilfield Castle (3.8 miles north) and Kodak Museum (1 mile south-east). For a walk, there’s Harrow Weald Common and Northala Fields.
When something else is needed
To be straight with you, there are a few things sealant won’t fix:
- Draughts through the window seals rather than the frame
- Damp problems in the wall away from the window
- A frame that has rotted at the joint
If in doubt, call 0345 464 0079 or send us an email and we’ll say what we think.
Surfaces we seal
- Aluminium frames
- uPVC windows
- Composite doors
- Window sills
- Timber windows & doors
- Patio & French doors
Questions from Headstone
Can parking be tricky for a visit in Headstone?
Parking in Headstone, as in most of London, takes a little planning: a visitor permit or a bay close to the door helps a lot, so mention what’s available when you book.
Is Headstone in your area for window mastic?
Yes. We work across London and the South East, and Headstone is part of that. You can ring 0345 464 0079 or email us and let us know what needs doing, and we will give you a clear price.
Can I paint over the new sealant?
Not if it’s silicone. We choose the product with your decorating in mind, so mention it when you book.
Do you guarantee window mastic?
Yes, with our one-year guarantee. A yearly look at the joints helps them last.
Do you work on first-floor windows?
Yes, as long as they can be reached safely. Tell us about access when you get in touch and we’ll plan for it.
What does window mastic cost?
There’s no set price, as it depends on the job: its size, the old material, access and the product needed. You’ll get a clear quote before we start.
I rent my home. Can I book you?
Yes. Check with your landlord; we can send the quote to them too.
Where do you work from?
Our base is in Crawley, and we work across South East England, London and Scotland.
What happens if it’s left?
If you are painting or rendering, reseal at the same time. 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 from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
Leaving a failed joint normally makes the job bigger, not smaller, as water and mould keep getting in. If you are unsure, phone 0345 464 0079 or email us and we’ll give you an honest view and a quote.
Why Headstone customers choose us
- Anti-fungal silicone where joints get wet
- Colour picked to suit the job
- Homes, businesses and hotels
- Approved under the ARBOMaster scheme
Take a look at our cost guide or our reviews.
What the job involves on each surface
uPVC windows
Plastic frames move a lot between a hot afternoon and a cold night, so the joint needs a low-modulus sealant that stays flexible. We match white, brown, anthracite grey and black frames.
Aluminium frames
Aluminium needs a sealant that bonds to coated metal. We use a neutral-cure product.
What affects the cost of window mastic
You will get a clear quote before any work starts. It takes into account:
- Working hours on commercial sites
- Whether the work is at height
- Which sealant suits the joint
- The size of the job
Combining jobs into one visit generally makes better use of the time than several visits, so tell us about everything that needs sealing. We will give you a clear price for the lot.
What we need to know
You do not need to know the technical terms. Just tell us:
- If someone has resealed it before
- Where the job is, and your postcode
- The problem you’ve noticed
- Whether it’s a home or a business
For a quote, call 0345 464 0079 or send us an email with the location and a short description of the problem. You’ll have a clear quote before any work starts.
Common problems we fix in Headstone
Sun, frost and rain wear sealant out. UV light hardens the outside of the bead, until it loses its stretch and starts to crack.
It’s worth asking for a quote if you see:
- Cold air getting in at the frame edge
- Damp patches on the reveal after heavy rain
- Cracked sealant at the sill ends
- Draughty joints inside around the window
Schools such as Pinner Park Primary School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s.
Comparing quotes
- What happens if they find a problem under the old sealant
- What the quote includes, VAT included or not
- Which colour the sealant will be
- How much experience the applicator has