Greater London · England
Window & door mastic in Lisson Grove, Greater London
Specialist window mastic for Lisson Grove: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Old mastic that has gone black or come away
- Cold air getting in at the frame edge
- Rushed sealant from a window installation
Surface by surface
Patio & French doors
Water at the foot of a door frame is not always the mastic: blocked drain slots, worn brush seals and threshold details can let water in too. We check before we reseal.
Composite doors
An exposed front door gets wind-driven rain. Those corners get the most care.
Window mastic in Lisson Grove, done properly
From a single sill to a whole house of windows, the work is priced before anything is done. To get one, phone 0345 464 0079 or email us with the number of frames and any access details. If you’re dealing with cracked or shrunken mastic around the frame and whistling draughts around closed windows, we can help.
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 Lisson Grove.
All our work is covered by a one-year guarantee, wherever you are in Greater London.
- Location
- Lisson Grove (NW8, W1H, W2)
- Region
- Greater London
- Guarantee
- A year, on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
DIY sealant or a professional job?
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
Keeping the joints in good condition
Once the sealant has cured, a few habits help it last:
- Walk round the house once a year and look at the joints
- Keep drainage slots and sill grooves clear
- Wash the frames with mild soapy water
- Ventilate rooms so frames do not stay wet inside
Keep the new mastic undisturbed while it cures, following the cure time we give you. Don’t point a pressure washer at the joints.
Wet, windy weather is when failed mastic shows itself, but resealing works best in dry conditions. Sorting cracked mastic early means the joint is sound before the bad weather.
Towns and villages near Lisson Grove
Also in Lisson Grove
How the visit works
All our tools and materials come with us in the van, so there’s nothing for you to buy. Once we have agreed what’s being done, we protect the area and start. Most jobs take anything from an hour or two to a full day, depending on how many frames there are. In Lisson Grove, flats, stairs and shared entrances are part of the routine. Mention any building rules, key holders or managing agents when you book.
- We start by checking each window and door with you.
- 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.
How to prepare
- Clear items away from the joints we’re working on
- For business premises, tell us about site rules or sign-in
- Tell us if parking is tricky
Get a quote
For a quote, phone 0345 464 0079 or email us and tell us where the job is and what the problem looks like. We will give you a clear price before any work starts.
Advice
Questions from Lisson Grove
Is parking an issue for window mastic in Lisson Grove?
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.
Can you help a landlord with a rental near London Marylebone station?
Yes, rental work is part of what we do. Just ring 0345 464 0079 or send us an email and tell us about the property, and we’ll send you a clear quote.
How long will my window job take?
A few frames take a few hours. We confirm the timing with your quote.
Can you work on commercial sites?
Yes. Commercial and hotel work is a large part of what we do, as well as homes. We can talk about working times when we quote.
Do you have insurance?
Yes. We are fully insured.
How do I get a quote for window mastic in Lisson Grove?
We don’t publish prices, because the cost depends on the job: how much there is, what’s there now, how we reach it and what it needs. You’ll get a clear quote before any work starts.
Can I do it myself?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Can you seal over the old sealant?
No. New silicone will not bond to old silicone, and anything trapped underneath, including mould and water, stays there. We remove it all first.
For landlords and businesses
We regularly work with letting and managing agents. Tell us the address, the job and how access works and we’ll quote.
Landlords and agents in Lisson Grove can book us as well as homeowners. Sealant work between tenants keeps a property looking cared for before the next move-in.
When it is not the sealant
Before booking, it’s worth knowing the limits:
- Draughts through the window seals rather than the frame
- A failed sealed unit that has misted up
- A sash or casement that won’t close properly
Not sure which it is? You can call 0345 464 0079 or drop us an email and we will tell you honestly before booking.
Where we work in Lisson Grove
- uPVC windows
- Window sills
- Aluminium frames
- Patio & French doors
- Composite doors
- Timber windows & doors
Window mastic in Lisson Grove: local notes
Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. Historic houses like Winfield House (about 0.4 miles north-east) are a reminder that the area around Lisson Grove has older buildings as well as new. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic.
As a London address, Lisson Grove can be tricky for parking: let us know about parking bays, permits or a driveway. If you look after a building such as Gateway Academy, larger buildings have plenty of frames, and the mastic around each one ages. Homes close to St Paul's Community Church include some older properties, and the joint between an old wall and a newer frame is normally the first place rain gets in.
Lisson Grove is about 1 mile north-west of City of Westminster, in Greater London. From the centre of Lisson Grove to the outskirts, window mastic is available for homes and businesses alike. Our Greater London coverage runs to 764 places, Lisson Grove among them.
Every address in NW8, W1H and W2 is within our area for window mastic. If you need window mastic at a property on Hall Road, Park Road and Lodge Road or anywhere close by, our applicators can take on the job. With the A5 and A40 close by, Lisson Grove is simple for us to get to. If you’re just outside Lisson Grove, we cover Paddington Green (1 mile south-west), Paddington (1 mile south), Little Venice (1 mile south-west), Connaught Village (1 mile south) and St John's Wood (1 mile north). Larger places within reach include London (4 miles south-east), Shoreditch (4 miles east), Walthamstow (8 miles north-east), Hoxton (4 miles east), Whitechapel (4 miles east) and Ruislip (11 miles west).
Landmarks near Lisson Grove
Locally, jobs take us to homes and businesses close to RIBA Library, St John's Wood Art School and Regent's Park, among other places. There’s a railway station in Lisson Grove itself: London Marylebone station. Other landmarks nearby include Montfichet's Tower (3 miles east) and Maida Vale Hospital for Nervous Diseases (0.5 miles west). Green spaces nearby include The Long Water and Greville Place nature reserve.
Why deal with it now?
Choosing the product is half the job. Interior caulk and bathroom silicone are not made for exterior frame joints. 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. Dealing with it early is far simpler for homes in Lisson Grove.
There are no prices on our website, because each job is priced on what it involves. Call for a quick quote and we’ll talk you through it.
Why book with us
- Neat joints and a tidy finish
- 180+ five-star Google reviews
- Sanitary silicone with an anti-fungal additive in wet areas
- One-year guarantee on every job
Take a look at what affects the cost or what customers say.