Greater London · England
South Oxhey Window Mastic
Window mastic for South Oxhey, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Hard, cracked sealant around windows
- Old mastic that has gone black or come away
- Cracked sealant at the sill ends
Landlord and commercial work in South Oxhey
In hotels, rooms out of use cost money, so the work can be planned room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.
Failed sealant is one of the commonest items on a check-out report. Several properties can go on one quote.
Window mastic for homes and businesses in South Oxhey
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. We work on window sills, patio & French doors and aluminium frames, and the jobs we see most are draughty joints inside around the window and old mastic that has gone black or come away.
London has a lot of flats and conversions, where windows are often on upper floors. In a converted house or block, the lease usually says who is responsible for the windows, so it’s worth checking before booking, and access in South Oxhey is something to talk through when you book.
Big or small, you get the same one-year guarantee.
- Place
- South Oxhey (WD19, HA6, HA5)
- Region
- Greater London
- Guarantee
- 12 months on all our work
- Price
- A clear price before work begins
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
What happens on the day
Our applicators work methodically: protect, prepare, seal, tidy. For most jobs that takes anything from an hour or two to a full day, depending on how many frames there are, and the area is left clean. For a job in South Oxhey, parking and access are the things to plan: let us know about parking, the floor we will be working on and any lift or shared entrance.
- We check each frame and agree which ones need doing.
- We remove the old mastic and clean the frame and the wall.
- Deep gaps are filled with backing rod to set the depth.
- New exterior sealant goes on in a matching colour and is tooled smooth.
- Finally we tidy up and check each joint.
Preparing for the visit
- Clear items away from the joints we’re working on
- Where the joints are inside, avoid wetting them before we arrive
- Let us know about parking restrictions
How to get a quote
Every job is quoted individually. Just call 0345 464 0079 or drop us an email with the details and send photos if you have them.
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Towns and villages near South Oxhey
More services for South Oxhey
Can I do it myself?
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it lifts and traps water and mould underneath. All the old material has to come out first.
When something else is needed
Before you book, it’s worth knowing the limits:
- Penetrating damp from a failed cavity tray or render
- A sash or casement that won’t close properly
- A failed sealed unit that has misted up
If you’re not sure, just call 0345 464 0079 or drop us an email and we’ll give you a straight answer.
Where we work in South Oxhey
- Timber windows & doors
- Patio & French doors
- Window sills
- uPVC windows
- Composite doors
- Aluminium frames
Looking after it afterwards
To keep the joints looking good and working properly:
- Make sure the drainage slots are not blocked
- Use gentle cleaners on frames and sealant
- Ventilate rooms so frames don’t stay wet inside
- 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.
On timber windows, water behind the joint can lead to rot. Rotten timber needs a joiner, not a sealant, so early resealing is worth it.
Different surfaces, different methods
Patio & French doors
Door frames take knocks and movement every time the doors are used. A flexible sealant copes with that without cracking.
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.
Common questions in South Oxhey
Is parking an issue for window mastic in South Oxhey?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot, so mention what’s available when you book.
Do you cover South Oxhey for window mastic?
Yes. Our work covers London and the South East, and South Oxhey is part of that. You can ring 0345 464 0079 or email us and let us know what needs doing, and we will send you a clear quote.
Do the sealants smell?
That depends on the sealant. Some smell for a while, some hardly at all, and any smell fades as they cure.
Is the new sealant paintable?
That depends on the product. Some hybrid sealants can be painted; silicone cannot. Tell us if you are decorating and we will choose accordingly.
Where is Mr Mastic based?
Our base is Crawley. Our area covers South East England, London and Scotland.
Can you seal over the old sealant?
No. The old sealant always comes out first.
Are you fully insured?
Yes. We’re fully insured, and we’ve been doing sealant work for more than 20 years.
Do you have sealant for grey or black windows?
Normally, yes. Tell us the frame colour when you get in touch and we’ll match it as closely as we can.
What affects the cost of window mastic
For a quick quote, just ask. The main things that affect it are:
- The old material and how stubborn it is
- Mould in or behind the old joints
- Working hours on commercial sites
- The size of the job
Instead of a standard rate, 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:
- Where the job is, and your postcode
- Whether it has been sealed before
- The rough size of the job
- Any access issues, like height or stairs
To get a quote, call 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. We will give you a clear quote before any work starts.
South Oxhey homes and the weather
Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. With historic houses such as Headstone Manor (about 2.4 miles south-east) nearby, there’s older building stock in the area around South Oxhey as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic.
South Oxhey is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book. In the older streets around Oxhey Chapel, the joint between an old wall and a newer frame is generally the first place rain gets in. Managing a site like Greenfields Primary School? Then the mastic around its windows and doors needs looking after like any other building’s.
South Oxhey is about 2 miles north-west of Hatch End, in Greater London. We provide window mastic to homes and businesses in South Oxhey and nearby, as part of our work across Greater London. 764 places in Greater London are on our list. We also work in London, around 15 miles away.
Every address in WD19, HA6 and HA5 is within our area for window mastic, from the main roads to the quietest streets. Whether your property is on Ilkley Road, Benton Road and Oakdale Road or anywhere close by, our applicators can take on the job. If you are just outside South Oxhey, we cover Carpenders Park (1 mile north-east), Watford Heath (1 mile north), Hatch End (2 miles south-east), Headstone (2 miles south-east) and Oxhey (2 miles north). Within a short drive, we also cover London (15 miles south-east), City of Westminster (13 miles south-east), Marylebone (13 miles south-east), Kensington (12 miles south-east), St Pancras (13 miles south-east) and Shoreditch (15 miles south-east).
Local landmarks in South Oxhey
Around South Oxhey, our work takes us to homes and buildings near Oxhey Park and Heathrow Aviation Engineering UTC. South Oxhey’s nearest station is Carpenders Park station, roughly 0.6 miles north-east of the centre. Other landmarks nearby include Hilfield Castle (3.3 miles north-east) and Heath Robinson Museum (1.9 miles south). Green spaces nearby include Tumbling Bay and Harrow Weald Common.