Greater London · England
Window & door mastic in Smithfield, Greater London
Window and door frames in Smithfield need attention? We cut out the old, prepare the joints and apply the right sealant.
- Water coming in at the bottom corners of a door
- Cracked sealant at the sill ends
- Whistling draughts around closed windows
Questions from Smithfield
Is parking an issue for window mastic in Smithfield?
Parking in Smithfield, as in most of London, takes a little planning: a visitor permit or a nearby bay makes the day run more smoothly, so mention what’s available when you book.
Is Smithfield in your area for window mastic?
Yes, Smithfield is within the area we cover. Our work covers London and the South East. Just call 0345 464 0079 or send us an email with a few details of the job, and we will give you a clear quote.
Can you get sealant to suit coloured frames?
Yes. White, brown, anthracite grey, black and clear sealants are all available.
Where is Mr Mastic based?
We work from Crawley. We cover Smithfield and the rest of Greater London, along with the rest of our area.
What does window mastic cost?
There’s no set price, as it depends on the job: how much there is, what’s there now, how we reach it and what it needs. We agree the price before any work begins.
Do you work for hotels and businesses?
Yes. We work in offices, washrooms, hotels and other commercial premises. We can talk about working times when we quote.
Are you ARBOMaster approved?
Yes. We’re approved under the ARBOMaster scheme, the approved applicator scheme for Arbo sealants.
Can resealing stop a draught around my window?
Yes, where the draught is at the frame edge. We find where the air is coming from before we reseal.
Window mastic in Smithfield
Colour matters on a frame. We can seal in white, brown, anthracite grey, black or clear, so the line suits the frame instead of standing out. Typical jobs include mastic that has split away from the wall and rain getting in at the frame or under the sill, across patio & French doors, uPVC windows and composite doors.
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.
The work is guaranteed for twelve months. If there’s a problem with our work within the year, let us know and we will sort it.
- Where
- Smithfield (EC1V, EC1P, EC1R)
- Region
- Greater London
- Cover
- 12 months on all our work
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Landlord and commercial work in Smithfield
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
For anyone letting property in or around Smithfield, several properties can go on one quote. Send us the addresses and the work at each, and pictures by email help.
Should I try it myself first?
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. All the old material has to come out first.
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
How the visit works
Every visit runs the same way: we check the joints, mask and protect the surrounding surfaces, do the work and clear up. Most jobs take anything from an hour or two to a full day, depending on how many frames there are. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Smithfield. It helps if you can point us to a visitor permit or a bay close to the door.
- We check each frame and agree which ones need doing.
- Next the failed sealant is cut away and the joint cleaned.
- Deep gaps are filled with backing rod to set the depth.
- We apply a weatherproof sealant to match the frame and tool it neatly.
- Every joint is checked before we leave.
Before we arrive
- Let us know about parking restrictions
- For indoor joints, keep the area dry beforehand if you can
- On commercial sites, let us know about site rules
How to get a quote
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and add photos by email if you can.
Advice
Window mastic in Smithfield: local notes
The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. With historic houses such as Dr Johnson's House (about 0.3 miles south-west) nearby, there’s older building stock in the area around Smithfield as well as newer homes. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window.
Rented homes near Farringdon station change hands often, and cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets. In the older streets around St Bartholomew-the-Less, the joint between an old wall and a newer frame is usually the first place rain gets in. Smithfield is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book.
Smithfield is about 1 mile north of London, in Greater London. Whether you’re in the middle of Smithfield or further out, we cover window mastic for every kind of property, from flats and houses to offices and hotels. Our Greater London coverage runs to 764 places, and Smithfield is one of them.
Jobs for window mastic in EC1V, EC1P and EC1R works the same way as everywhere else we cover. That includes homes and businesses on Oat Lane, Shoe Lane and Long Lane and the roads around them. Smithfield sits on or near the A1 and A4. If you are just outside Smithfield, we cover Farringdon (1 mile north), Blackfriars (1 mile south), Holborn (1 mile west), Temple Bar (1 mile south-west) and Clerkenwell (1 mile north). Further out, we also cover Kensington (4 miles west), Walthamstow (6 miles north-east), Hampstead (4 miles north-west), Ruislip (14 miles west), Brompton (3 miles south-west) and Stockwell (4 miles south).
What’s near Smithfield
Typical jobs here are in homes near London Nautical School, Barts Health Archives and St Alban's Church of England Primary School, among other places. Nearby too are St Mary-at-Hill (1 mile south-east), Oriole pub (less than half a mile south-west) and Postman's Park (within half a mile south-east). There’s a railway station in Smithfield itself: Farringdon station. Nearby you will also find Montfichet's Tower (less than half a mile south) and Postal Museum (within half a mile south-east). The countryside around Smithfield includes Ludgate Hill and St. James's Park Lake.
Places near Smithfield
More services for Smithfield
Aftercare tips
Once the sealant has cured, a few habits help it last:
- Keep jet washers away from the mastic
- Keep paint off silicone joints
- Clear any debris from frame drain holes
- Keep solvents and bleach off the sealant
Check the drainage slots in the frames are not blocked, so water can run away instead of sitting against the joint.
Water trapped behind a failed joint can start rot in timber frames and sills. Once wood has rotted, it needs repair before it can be sealed, so it pays to reseal before that happens.
When something else is needed
It helps to know what we cannot do:
- Soft or decayed wood in the frame
- A failed sealed unit that has misted up
- 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’ll tell you honestly before booking.
Where we work in Smithfield
- Timber windows & doors
- Patio & French doors
- uPVC windows
- Window sills
- Composite doors
- Aluminium frames
What affects the quote in Smithfield
Jobs vary more than people expect. What affects the quote:
- Any working-time requirements on site
- How much old sealant there is and how hard it is to remove
- Any mould that needs treating
- Access and height
Doing several joints on one visit generally makes better use of the time than several visits, so tell us about everything that needs sealing. You will get one clear quote for the whole job.
Asking for a quote
Photos help, but a description is a good start. Try to tell us:
- The type of property
- How many joints, rooms or windows are involved
- Pictures of the joints, sent by email
- The problem you’ve noticed
There’s no standard price list, as no two jobs are quite the same. Instead, we give you a clear price for your job. To arrange one, phone 0345 464 0079 or send us an email.
Why deal with it now?
Choosing the product is half the job. Interior caulk and bathroom silicone aren’t made for exterior frame joints. A low-modulus exterior sealant keeps its stretch through hot and cold weather. In a London flat, a failed joint rarely stays your problem alone: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
Commercial jobs are quoted on the same basis as homes: the amount of work, how we reach it and what it needs, along with when we can work on site. Call for a quick quote and we will explain what it covers.
Why book with us
- We leave the area clean and tidy
- We agree the colour with you first
- Over 20 years’ experience
- Old sealant always removed completely
See our cost guide or customer reviews.