Greater London · England
Window & door mastic in Lissenden Gardens, Greater London
Window mastic in Lissenden Gardens from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Old mastic that has gone black or come away
- Sealant in the wrong colour for the frame
- Draughts coming in around windows and doors
Can I do it myself?
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
If you’ve already had a go yourself, that’s fine. We remove it and do the joint properly, so tell us about it when you ask for a quote.
Window mastic in Lissenden Gardens
A cold draught around a closed window often comes from the frame edge. A new joint stops the air getting through. If the draught is through the window seals instead, we’ll tell you. We work on uPVC windows, window sills and patio & French doors, and the jobs we see most are untidy mastic left by window fitters and sealant in the wrong colour for the frame.
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.
You get a one-year guarantee, the same in Lissenden Gardens as everywhere else we work.
- Where
- Lissenden Gardens (NW5, NW3, N19)
- Wider area
- Greater London
- Cover
- A year, on every job
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Why deal with it now?
The work is quick compared with the damage it prevents: the visit takes a few hours for a few frames, or a day or more for a whole house. Leave it until water is coming in and you may need plastering and decorating as well. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in Lissenden Gardens, the repair is bigger than a sealant job.
No two jobs are quite the same, so each one gets its own quote. Size, access and the product the joint needs all make a difference, and we’ll explain the quote if you ask.
Why us?
- White, clear, grey or coloured to suit, where the product allows
- Any old sealant cut out fully, not covered over
- 4.9 on Google from 180+ five-star reviews
- Approved under the ARBOMaster scheme
Common questions in Lissenden Gardens
Can you help a landlord with a rental near Gospel Oak station?
Yes, landlords and agents are among the people we work for. Just call 0345 464 0079 or send us an email with the address and what needs doing, and we will give you a clear price.
Do you cover Lissenden Gardens for window mastic?
Yes, Lissenden Gardens is within the area we cover. We work across London and the South East. Just call 0345 464 0079 or email us with a few details of the job.
What should I tell you?
Where the job is, what the problem is and roughly how big it is. Photos by email help too.
Are you an approved applicator?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we’re part of it.
Does someone need to be in?
That depends on where the joints are. Inside work needs someone to give us access, and for outside work we’ll agree access with you when we book.
Which products do you use?
It depends on the joint: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. Brands we use include Arbo and Everbuild.
How do I get a quote for window mastic in Lissenden Gardens?
Every job is different, so each one gets its own quote. To get one, phone 0345 464 0079 or send us an email and let us know what needs doing and where.
Can new sealant go over the old?
No. Fresh sealant doesn’t stick to old sealant, and anything trapped underneath, including mould and water, stays there. We remove it all first.
What we cannot put right
We’d rather tell you now than do work that won’t last, so here’s what sealant can’t put right:
- Soft or decayed wood in the frame
- Worn gaskets, brush seals or a door that has dropped
- Damp coming through the wall itself rather than the frame joint
Not sure which it is? You can phone 0345 464 0079 or email us and we will tell you honestly before booking.
Surfaces we seal
- Aluminium frames
- Patio & French doors
- uPVC windows
- Window sills
- Composite doors
- Timber windows & doors
Keeping the joints in good condition
How long the joints last depends on use and care. Here’s what we suggest:
- Keep jet washers away from the mastic
- Check the mastic once a year
- Keep paint off silicone joints
- Clear any debris from frame drain holes
Keep the new mastic undisturbed while it cures, for as long as we advise. Keep jet washers away from the frames.
Leaks generally show up in wet, windy weather, but resealing works best in dry conditions. Dealing with it when you first notice a crack avoids chasing leaks through the wet months.
For landlords and businesses
We also work for property managers and facilities teams. Several sites can go on one quote, and we’re fully insured for the work.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. We can quote for more than one property at once.
Towns and villages near Lissenden Gardens
What else we do in Lissenden Gardens
What affects the cost of window mastic
We do not publish a price list. What we look at:
- The old material and how stubborn it is
- The product the joint needs
- Any working-time requirements on site
- The number of rooms or windows
A few things move the cost up or down: how much old sealant there is and how stubborn it is, any mould to treat, and whether the work is at height. Your quote takes all of that into account.
Helping us quote
To help us quote quickly, let us know:
- Access, such as stairs, a lift or height
- Pictures of the joints, sent by email
- The type of property
- If someone has resealed it before
Asking for a quote is easy: let us know the job and the location, and roughly how big it is. A few pictures by email make the job easier to understand, and we will take it from there.
Lissenden Gardens homes and the weather
In a converted house or block, who looks after the windows depends on the lease, so check that before booking. The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
If you look after a building such as Parliament Hill School, larger buildings have plenty of frames, and the mastic around each one ages. As a London address, Lissenden Gardens can be tricky for parking: tell us about permits, visitor bays or off-street space when you book. In the older streets around Highgate Road Chapel, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Lissenden Gardens is about 1 mile east of Hampstead, in Greater London. From the centre of Lissenden Gardens to the outskirts, we cover window mastic for every kind of property. Across Greater London, we cover 764 places, and Lissenden Gardens is one of them.
Postcode districts we cover here for window mastic: NW5, NW3 and N19. That includes homes and businesses on Rona Road, Dale Road and Fleet Road. Close by, we work in Gospel Oak (1 mile south), Dartmouth Park (1 mile north-east), Tufnell Park (1 mile east), Kentish Town (1 mile south) and Chalk Farm (1 mile south). Further out, we also cover London (5 miles south-east), City of Westminster (3 miles south), Marylebone (3 miles south), Kensington (5 miles south-west), St Pancras (3 miles south-east) and Shoreditch (4 miles south-east).
Around Lissenden Gardens
We work in homes and buildings around Parliament Hill, The Royal School and Gospel Oak Primary School and the streets around them. Also close by are The Bull and Last pub (within half a mile north-east) and Cecil Sharp House (1.3 miles south). There’s a railway station in Lissenden Gardens itself: Gospel Oak station. Well-known places in the area include Royal Northern Hospital (1.2 miles east) and Montfichet's Tower (3.7 miles south-east). The countryside around Lissenden Gardens includes Parliament Hill and The Long Water.
The process
Once we’re on site, we compare the joints with what we discussed. If we find something unexpected, we talk it through with you first. After that, the work takes most of a day for a typical house, less for a few frames. In Lissenden Gardens, 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 each frame and agree which ones need doing.
- The old mastic is cut out and the surfaces cleaned back.
- Where gaps are deep, backing rod goes in first.
- We apply a weatherproof sealant to match the frame and tool it neatly.
- Finally we tidy up and check each joint.
Before we arrive
- Mention any tricky access
- Try not to wet indoor joints just before the visit
- Let us know about parking restrictions
How to get a quote
For window mastic in Lissenden Gardens, ring 0345 464 0079 or send us an email. A short description of the job and where it is helps us quote, and we’ll agree the price before any work begins.