Greater London · England
Sand Mastic in Temple Fortune
Window and door surrounds in Temple Fortune need attention? We cut out the old, prepare the joints and apply the right sealant, with a 12-month guarantee.
- Silicone on a period window that looks wrong
- Cement or filler used on old window joints that has cracked
- Failed mastic on an exposed elevation
Sand mastic in Temple Fortune, done properly
Burnt sand mastic is a traditional material blends with stone and brick surrounds. It’s a good fit for period properties, where modern sealant can look out of place. We work on brick reveals, tenement windows and timber door frames, and people most often call us about draughts and rain around sash boxes and patchy fillers round a sash window.
Many London homes are flats, with windows high above the street. In a converted house or block, the lease generally says who is responsible for the windows, so it’s worth checking before booking, and access in Temple Fortune is something to talk through when you book.
Each job carries a 12-month guarantee, large or small.
- Place
- Temple Fortune (NW11, NW4, N3)
- Wider area
- Greater London
- Cover
- A year, on every job
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
DIY sealant or a professional job?
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
If you’re set on DIY, put the effort into 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.
For landlords and businesses
If you manage several properties in or around Temple Fortune, several properties can go on one quote. Just tell us the addresses and what each one needs.
In hotels, rooms out of use cost money, so we plan the work room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.
Quotes for sand mastic in Temple Fortune
Jobs vary more than people expect. What affects the quote:
- Whether old sealant or filler has to be cut out
- Working hours on commercial sites
- The number of rooms or windows
- Whether the work is at height
Doing several joints on one visit normally makes better use of the time than several visits, so it’s worth mentioning everything you’d like done. You’ll get one clear quote for the whole job.
What to tell us for a quote
When you contact us, it’s useful to know:
- The problem you’ve noticed
- Any previous sealing or DIY work
- The rough size of the job
- Whether it’s a home or a business
To get a quote, ring 0345 464 0079 or email us and tell us where the job is and what the problem looks like. You’ll have a clear quote before any work starts.
How to look after the new joints
How long the joints last depends on use and care. Here’s what we suggest:
- Look over the window mastic once a year
- Avoid patching sand mastic with silicone
- Renew mastic before redecorating the windows
- Check with your local planning authority if your home is listed
Keep gutters and sills clear so water runs away from the surround. Water sitting against the mastic shortens its life.
It’s best to renew mastic before painting the windows. Paint over cracked mastic only covers it up.
Frames and glazing around Temple Fortune
In a converted house or block, who looks after the windows depends on the lease, so check that before booking. London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Schools such as Garden Suburb Infant School are buildings too, and the mastic around its windows and doors needs looking after like any other building’s. As a London address, Temple Fortune can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Temple Fortune is about 1 mile south-west of Finchley, in Greater London. From the centre of Temple Fortune to the outskirts, sand mastic is available for homes and businesses alike. 764 places in Greater London are on our list, from the larger towns to small villages. We also work in London, about 7 miles from Temple Fortune.
We work across the NW11, NW4 and N3 postcode area for sand mastic and the streets around it. Sand mastic is available to properties on Hoop Lane, Bridge Lane and Limes Avenue and the roads around them. Temple Fortune sits on or near the A598. We also cover the places around Temple Fortune: Golders Green (1 mile south), Hampstead Garden Suburb (1 mile east), East Finchley (1 mile north-east), North End (1 mile south-east) and Childs Hill (1 mile south). Within a short drive, we also cover London (7 miles south-east), City of Westminster (5 miles south-east), Marylebone (5 miles south-east), Kensington (6 miles south), St Pancras (5 miles south-east) and Shoreditch (6 miles south-east).
Around Temple Fortune
Locally, jobs take us to homes and businesses close to The Henrietta Barnett School, The King Alfred School and Princes Park. Temple Fortune’s nearest station is Brent Cross West station, about 1.5 miles south-west of the centre. A little further out are Highgate Private Hospital (1.9 miles east) and Jewish Museum - Finchley (1 mile north-east). For a walk, there’s Darland's Lake and Parliament Hill.
Your questions about sand mastic in Temple Fortune
Is parking a problem for a job in Temple Fortune?
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 work for landlords with property near Brent Cross West station?
Yes, we work for landlords and letting agents. You can call 0345 464 0079 or drop us an email with the address and a few details, and we’ll give you a fixed price before we start.
When will the new mastic be hard?
It forms a skin fairly soon, then hardens over a longer period. Timing depends on the weather and the joint.
Do you remove the old sealant?
Always. Sealing over old sealant is the main reason resealing fails early, so we never do it.
Which products do you use?
We choose the sealant for the joint, not the other way round. Movement, water and weather all affect the choice.
Is sand mastic better than silicone for my windows?
Sand mastic generally suits period timber windows best. On modern frames, we’d normally use a flexible sealant, and we will explain why.
Can you do several jobs on one visit?
Yes. Just list everything you need and we’ll quote it together.
Where is Mr Mastic based?
Mr Mastic is based in Crawley. Our applicators cover Temple Fortune.
The process
We keep the work tidy and contained to the area we are working on, so you can get on with your day. The job generally takes anything from a few hours to a full day, depending on how many windows. 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.
- First we agree which joints need doing.
- 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.
How to prepare
- Clear the area around the work
- Keep pets and children clear of the area while we work
- Mention any parking rules near the property
Get a quote
For a quick quote, get us on the phone, or send an email if you’d rather. Tell us about the joints that need doing and we will explain what’s involved and give you a clear price.
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Signs you need sand mastic in Temple Fortune
Sand mastic slowly weathers. It hardens, cracks and starts to come away on the stone or timber.
Any of these means the joints need attention:
- Old sand mastic that has cracked, crumbled or fallen out
- Silicone on a period window that looks wrong
- Gaps round a timber door in stone or brick
- Mastic worn away on windows facing the weather
For an older house near a landmark such as Saint Mary and Archangel Michael Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
What your quote should include
- Which sealant they’ll use, and why
- When the joint can take water or movement
- How the colour is chosen
- How the surfaces are prepared before sealing
Towns and villages near Temple Fortune
More services for Temple Fortune
When something else is needed
A few problems are outside what sealant work can do:
- Sash cords, weights and draught-proofing of the sashes
- Decayed frames that need repair
- Putty and glazing repairs
Not sure which it is? You can ring 0345 464 0079 or send us an email and we will tell you honestly.
Surfaces we seal
- Timber door frames
- Sash and case windows
- Tenement windows
- Period & listed homes
- Stone surrounds
- Brick reveals