Greater London · England
Lissenden Gardens Sand Mastic
Problem with your window and door surrounds in Lissenden Gardens? We cut out the old, prepare the joints and apply the right sealant, and the work is guaranteed for a year.
- A silicone bead on a sash window that spoils the look
- Old sand mastic that has cracked, crumbled or fallen out
- Failed mastic on an exposed elevation
Lissenden Gardens questions
Do you cover Lissenden Gardens for sand mastic?
Yes, Lissenden Gardens is within the area we cover. Our work covers London and the South East. Just ring 0345 464 0079 or send us an email with a few details of the job, and we will give you a clear quote.
Can parking be tricky for a visit in Lissenden Gardens?
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.
Do you offer different sealant colours?
We’ll suggest a colour to suit the surroundings. The product needed can limit the range.
Is it OK to seal over old sealant?
No. The old sealant always comes out first, so the new joint bonds to clean surfaces.
Should I use sand mastic or silicone?
It depends on the window. On many period windows, sand mastic looks right and suits the building, while modern frames normally get a flexible sealant.
Do you take out the old sealant first?
Yes, every time. New silicone does not stick to old silicone, so any old material comes out before anything new goes in.
Do the sealants smell?
It depends on the product. Some smell for a while, some hardly at all, and any smell fades as they cure.
Is it possible to take out silicone and use sand mastic instead?
Often, yes. With the silicone removed and the joint cleaned, sand mastic is applied by hand.
Sand mastic in Lissenden Gardens
Sand mastic has long been used to fill the joint between timber frames and masonry. It’s made from sand and a linseed-oil-based binder and built up by hand. On older homes, it suits the building far better than silicone. Typical jobs include draughts and rain around sash boxes and old sand mastic that has cracked, crumbled or fallen out, across brick reveals, period & listed homes and timber door frames.
Many London homes are flats, with windows high above the street. Who looks after the outside of the frames can depend on the lease, so check that first, and access in Lissenden Gardens is something to talk through when you book.
All of our work is guaranteed for twelve months, and the guarantee is the same wherever you are.
- Place
- Lissenden Gardens (NW5, NW3, N19)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Different surfaces, different methods
Stone surrounds
Sand mastic sits naturally against stone. The finish blends with the masonry.
Brick reveals
Sand mastic is also used where timber frames meet brick. It suits older brickwork.
Honest limits
Honest advice matters more to us than a booking, so here’s what sealant can’t fix:
- Cracked or broken glass
- Sashes that need overhauling
- Timber that has rotted
Not sure which it is? You can phone 0345 464 0079 or send us an email and we’ll tell you honestly.
Joints and surfaces we work on
- Sash and case windows
- Stone surrounds
- Period & listed homes
- Timber door frames
- Brick reveals
- Tenement windows
What happens if it’s left?
Not every filler suits an old window surround. Sand mastic matches what was there and that can be important for listed homes. In a flat in Lissenden Gardens, failed sealant seldom stays inside your own four walls: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
A failed joint rarely gets cheaper to fix by waiting, as water and mould keep getting in. If you’re not sure whether it needs doing, call 0345 464 0079 or send us an email for an honest opinion and a quote.
Why Lissenden Gardens customers choose us
- More than 20 years in sealant work
- Trusted Arbo and Everbuild sealants
- One-year guarantee on every job
- Anti-fungal silicone where joints get wet
Take a look at what affects the cost or our reviews.
Work for landlords, hotels and businesses
Hotels need rooms back in use, so the work can be planned room by room. 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, and it’s easy to sort out between tenants. Several properties can be quoted together.
Windows and doors in Lissenden Gardens
Historic houses like Keats House (about 0.8 miles west) are a reminder that the area around Lissenden Gardens has older buildings as well as new. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window. In London conversions and blocks, the lease decides who is responsible for the frames, so it’s worth checking before booking.
Rented homes near Gospel Oak station change hands often, and any sash windows need sound mastic to keep draughts and rain out. Schools such as Parliament Hill School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages. Lissenden Gardens is in London, so parking needs planning: let us know about parking bays, permits or a driveway.
Lissenden Gardens is about 1 mile east of Hampstead, in Greater London. Lissenden Gardens gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Across Greater London, we cover 764 places, and Lissenden Gardens is one of them.
We work across NW5, NW3 and N19 for sand mastic. Sand mastic is available to properties on Rona Road, Dale Road and Fleet Road and the roads around them. If you’re just outside Lissenden Gardens, we cover 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). Within a short drive, 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).
What’s near Lissenden Gardens
Around Lissenden Gardens, our work takes us to homes and buildings near Parliament Hill, The Royal School and Gospel Oak Primary School, among other places. Also close by are The Bull and Last pub (within half a mile north-east) and Cecil Sharp House (1.3 miles south). Lissenden Gardens has its own railway station: 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.
DIY sealant or a professional job?
A DIY attempt does not rule out a professional job. We remove it and do the joint properly, so just mention it when you contact us.
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
How the visit works
Every visit runs the same way: we check the joints, protect the area around them, carry out the job and clear up. It generally takes a few hours for a single window, longer for several. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. If the building has a concierge, managing agent or access rules, tell us when you book.
- We look at the surrounds with you and agree the joints to renew.
- Old mastic and any loose material are raked out.
- We pack any deep voids first.
- We apply the mastic by hand and shape it.
- The surface is finished to suit the stone or brick.
Preparing for the visit
- Plan for the work area to be out of bounds to pets and children
- Let us know if you’ve seen damp or leaks
- Where the joints are inside, avoid wetting them before we arrive
Getting a quote
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we’ll explain how we’d tackle it. When it suits you, ring 0345 464 0079 or send us an email.
Advice
Towns and villages near Lissenden Gardens
What else we do in Lissenden Gardens
Looking after it afterwards
Aftercare is simple, and it makes a real difference:
- Sort the mastic before the decorators arrive
- Keep modern sealant off the mastic
- Check the mastic when you check the paintwork
- Don’t paint over the new mastic
Keep paint scrapers and sanders off the mastic when redecorating. Hard scraping can loosen it.
Renewing mastic before redecorating saves doing it twice. Paint over cracked mastic only covers it up.