Greater London · England
Sand mastic for sash & case windows in Lisson Grove, Greater London
Sand mastic for Lisson Grove, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Modern sealant on a period surround
- Old cement repairs round a window that have failed
- Open joints round the window box
Why act early in Lisson Grove
New mastic over crumbling mastic will not hold. Raking out and preparing the joint gives it a sound base so the new mastic stays put. Converted houses in London often have a bathroom above someone else’s living room, and a slow leak from a failed seal can end up in the flat below. Dealing with it early is far simpler.
A failed joint rarely gets cheaper to fix by waiting, as water and mould keep getting in. If you are not sure whether it needs doing, phone 0345 464 0079 or email us for an honest opinion and a quote.
Why choose Mr Mastic in Lisson Grove
- ARBOMaster approved applicator
- Quality sealants from Arbo and Everbuild
- Old sealant always removed completely
- Rated 4.9 stars on Google
Take a look at our cost guide or our reviews.
About our sand mastic in Lisson Grove
We work across Lisson Grove renewing sand mastic on sash windows and doors. Each joint is raked out, prepared and pointed by hand for a neat, traditional finish. If you have mastic round period door frames that has failed and mastic worn away on windows facing the weather, we can put it right, whatever the surface.
London homes have every kind of window, from timber sashes in period terraces to aluminium and uPVC in newer blocks. The mastic around them dries out and cracks with age, letting in draughts and water.
Every job comes with a 12-month guarantee, wherever you are in Greater London.
- Where
- Lisson Grove (NW8, W1H, W2)
- Region
- Greater London
- Cover
- 12 months on all our work
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Landlords, agents and businesses in Lisson Grove
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 quick to put right between tenancies. Several properties can be quoted together.
Lisson Grove homes and the weather
In London conversions and blocks, the lease decides who is responsible for the frames, so check that before booking. With historic houses such as Winfield House (about 0.4 miles north-east) nearby, there’s older building stock in the area around Lisson Grove as well as newer homes. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic.
Letting a property close to London Marylebone station? Then older sash windows in a rental need their mastic kept sound to keep the weather out. As a London address, Lisson Grove can be tricky for parking: let us know about parking bays, permits or a driveway.
Lisson Grove is about 1 mile north-west of City of Westminster, in Greater London. Jobs in Lisson Grove get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Lisson Grove is one of 764 towns and villages in Greater London where we work.
Our applicators cover all of NW8, W1H and W2 for sand mastic and the streets around it. Sand mastic is available to properties on Hall Road, Park Road and Lodge Road and the roads around them. Lisson Grove sits on or near the A5 and A40, which makes travel easy. Neighbouring places we cover for sand mastic include 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). Further out, we also cover 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).
Near you in Lisson Grove
We work in homes and buildings around RIBA Library, St John's Wood Art School and Regent's Park. Lisson Grove has its own railway station: London Marylebone station. Well-known places in the area include Montfichet's Tower (3 miles east) and Maida Vale Hospital for Nervous Diseases (0.5 miles west). Not far away are The Long Water and Greville Place nature reserve.
FAQs for Lisson Grove
Is Lisson Grove in your area for sand mastic?
Yes. Our work covers London and the South East, and Lisson Grove is part of that. Just call 0345 464 0079 or drop us an email with a few details of the job, and we’ll give you a clear price.
Is parking a problem for a job in Lisson Grove?
Parking in Lisson Grove, as in most of London, takes a little planning: a visitor permit or a nearby bay makes the day run more smoothly.
Do you have insurance?
Yes, we are fully insured.
Where is Mr Mastic based?
We are a Crawley-based firm. We work across South East England, London and Scotland.
Should I use sand mastic or silicone?
For period timber windows in stone or brick, sand mastic is often the better fit. Modern frames normally suit a flexible sealant.
Can sand mastic be painted?
It’s traditionally left unpainted, which is what traditional guidance recommends. Ask us before decorating.
Can you match the sealant colour?
Generally, yes. White, clear and grey are common, and other colours are available, and we’ll agree it with you first.
How long does sand mastic take to harden?
It takes a while. It skins first and hardens fully later, and we will tell you what to expect.
Signs you need sand mastic in Lisson Grove
Age is the main cause. Sand mastic is a maintenance item like any pointing and how long it lasts depends on the weather it faces.
These are the problems we’re asked about most:
- Crumbling sand mastic round a window
- Patchy fillers round a sash window
- Gaps round a timber door in stone or brick
- Window mastic to renew ahead of painting
If you live in an older home near St Paul's Community Church, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Questions to ask before you book
- How the surfaces are prepared before sealing
- How much experience the applicator has
- Are they insured?
- When the joint can take water or movement
Surface by surface
Brick reveals
An open joint at a brick reveal lets weather in. Renewing the mastic closes it.
Tenement and terrace windows
Tenements and terraces often have many sash windows with ageing mastic. We work on single windows or whole elevations.
How it works
Our applicators work methodically: protect, prepare, seal, tidy. Typically it takes a few hours for a single window, longer for several, and the area is left clean. For a job in Lisson Grove, parking and access are the things to plan: tell us about permits, visitor bays or off-street space, which floor we’re working on and whether there’s a lift.
- First, we look at the surrounds with you and agree what needs doing.
- The loose and crumbling mastic is raked out and the joint cleaned.
- Large voids are packed out first, so the mastic isn’t too thick.
- We mix the sand mastic and apply it by hand, shaping it to the joint.
- We dress the surface so it sits neatly against the masonry.
How to prepare
- Let us know about earlier repairs to the joints
- Mention any parking rules near the property
- Keep children and pets away from the work area
How to get a quote
Asking for a quote is easy: let us know the job and the location, and roughly how big it is. Photos by email help us understand the job, and we’ll take it from there.
Advice
Honest limits
Before booking, it’s worth knowing the limits too:
- Sashes that rattle, stick or won’t open
- Broken panes
- Damaged stone surrounds
If you’re not sure, just phone 0345 464 0079 or send us an email and we’ll give you a straight answer.
Joints and surfaces we work on
- Timber door frames
- Period & listed homes
- Stone surrounds
- Tenement windows
- Sash and case windows
- Brick reveals
Also near Lisson Grove
Other services in Lisson Grove
What affects the quote in Lisson Grove
We do not publish a price list. What we look at:
- How much there is to do
- The type of sealant required
- How easy the joints are to reach
- How many areas need sealing
The cost depends on the amount of work, how hard the old material is to remove and how easy the joints are to reach. You’ll have a clear quote before any work starts.
Asking for a quote
To make quoting easier, please include:
- Where the property is
- Pictures of the joints, sent by email
- Access, such as stairs, a lift or height
- Roughly how big the job is
Want a quote for sand mastic? Please ring 0345 464 0079 or email us and tell us about the job. We will explain what we’d do and give you a clear quote before work begins.