Greater London · England
Window & door mastic in Covent Garden, Greater London
Professional window mastic in and around Covent Garden, with old sealant always removed completely and a 12-month guarantee.
- Cold air getting in at the frame edge
- Rain getting in at the frame or under the sill
- Gaps where the sill meets the wall
Common questions in Covent Garden
Can you do window mastic in Covent Garden?
Yes. We work across London and the South East, and Covent Garden is part of that. You can ring 0345 464 0079 or drop us an email and let us know what needs doing, and we will send you a clear quote.
Is parking a problem for a job in Covent Garden?
Parking in Covent Garden, 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.
Can you seal the gap between the frame and the plaster indoors?
Yes. Draughts often come through the inside gap too, so sealing both is often worthwhile.
Is it worth trying it myself?
Sometimes. Preparation is everything: all the old sealant out, and a clean, dry joint. If it does not work out, we can redo it.
Can you reach windows above the ground floor?
Normally, yes. Access is planned before any work starts, so mention the height and anything in the way.
What sealant 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. We use products from Arbo and Everbuild.
I rent my home. Can I book you?
Of course. Ask your landlord first, and we can send them the quote if that helps.
Can you get sealant to suit coloured frames?
Yes. White, brown, anthracite grey, black and clear sealants are all available, so the joint suits the frame.
Window mastic in Covent Garden, done properly
Mr Mastic’s applicators have more than 20 years’ experience with window and door sealants. We are fully insured ARBOMaster approved applicators, and every job is covered by a 12-month guarantee. If you are dealing with damp patches on the reveal after heavy rain and cold air getting in at the frame edge, we can put it right, on uPVC windows, composite doors and aluminium frames alike.
Much of London’s older housing was built with timber sash windows, some still in place and some long since replaced. Whatever is in the opening now, the joint between frame and wall is what keeps the weather out, in Covent Garden as anywhere.
You get a 12-month guarantee, the same in Covent Garden as everywhere else we work.
- Where
- Covent Garden (W1F, W1D, W1T)
- Wider area
- Greater London
- Cover
- A year, on every job
- Price
- A clear price before we start
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Window mastic in Covent Garden: local notes
In a converted house or block, who looks after the windows depends on the lease, so it’s worth checking before booking. Historic houses like Benjamin Franklin House (about 0.4 miles south) are a reminder that the area around Covent Garden has older buildings as well as new. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic.
As a London address, Covent Garden can be tricky for parking: let us know about parking bays, permits or a driveway. For landlords with property near London Charing Cross station, cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
Covent Garden is about 1 mile east of City of Westminster, in Greater London. Whether you’re in the middle of Covent Garden or further out, we cover window mastic for every kind of property. Covent Garden is one of 764 places in Greater London where we work for window mastic.
Postcode districts we cover here for window mastic: W1F, W1D and W1T. Window mastic is available to properties on Duck Lane, Drury Lane and New Square and the roads around them. Being close to the A301 and A400, Covent Garden is easy for our applicators to reach for window mastic. We also cover the places around Covent Garden: Seven Dials (1 mile west), Aldwych (1 mile east), Adelphi (1 mile south), St Giles (1 mile north-west) and Clare Market (1 mile north-east). Further out, we also cover Kensington (4 miles west), Walthamstow (7 miles north-east), Hampstead (4 miles north-west), Ruislip (13 miles west), Stockwell (3 miles south) and Orpington (13 miles south-east).
Landmarks near Covent Garden
Around Covent Garden, our work takes us to homes and buildings near Victoria Embankment Gardens, London Nautical School and Mercers' School. You will also find Punch & Judy pub (within half a mile south-west) and LSE Shaw Library (less than half a mile north-east). Covent Garden has its own railway station: London Charing Cross station. Well-known places in the area include Montfichet's Tower (0.9 miles east) and Savoy Hospital (under half a mile south-east). Open spaces near Covent Garden include Ludgate Hill and Barnsbury Wood.
Also near Covent Garden
Also in Covent Garden
What affects the quote in Covent Garden
Call for a quick quote. What matters most is:
- How many rooms, windows or areas are involved
- The old material and how stubborn it is
- The number and length of the joints
- The product the joint needs
Doing several joints on one visit is normally more efficient than separate visits, so tell us about everything that needs sealing. We will send you a clear quote for the lot.
Helping us quote
To help us quote quickly, please include:
- Where the property is
- The rough size of the job
- Pictures of the joints, sent by email
- If it’s domestic, commercial or a hotel
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we will talk you through what we’d do. When it suits you, phone 0345 464 0079 or drop us an email.
How it works
On the day, we start by going over the job with you. Surfaces next to the work are protected before any work starts. The work normally takes 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 Covent Garden. A visitor permit or a nearby bay makes the visit run more smoothly.
- First we look at every frame and agree the list.
- Next the failed sealant is cut away and the joint cleaned.
- Where gaps are deep, backing rod goes in first.
- A flexible, weatherproof sealant is applied in a colour to suit the frame.
- We clear up and check every joint is fully closed.
Getting ready for the visit
- Keep children and pets away from the work area
- Tell us about access, such as stairs, a lift or high-level joints
- Clear items away from the joints we are working on
Getting a quote
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is, and add pictures by email if you can.
Read more
When to call us in Covent Garden
Plenty of failed mastic was poorly applied in the first place. Sealant run over dust, wet brick or loose mortar didn’t grip properly, and it lets go sooner than it should.
Most people get in touch after spotting something like this:
- Mastic that’s falling out in pieces
- Rushed sealant from a window installation
- Hard, cracked sealant around windows
- Draughts coming in around windows and doors
In the older streets around Crown Court Church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
What to look for in a quote
- How long to leave it before use
- How the joint is cleaned and prepared
- Whether VAT is included
- What guarantee comes with the work
How to look after the new joints
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Keep drainage slots and sill grooves clear
- Check the mastic once a year
- Do not aim a pressure washer at the joints
- Keep timber frames painted
Most silicone sealants will not take paint, so mention any painting plans before we start. We can use a paintable sealant where that matters.
Look out for the warning signs: split or missing mastic, gaps, damp patches inside or black mould on the reveal. If you notice one, it’s time to get the joint looked at.
Should I try it myself first?
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
How the job changes by surface
Aluminium frames
Coated aluminium needs a compatible sealant. We use a neutral-cure product.
Composite doors
Draughts round the door leaf usually come from worn seals or adjustment, not the mastic. We will tell you if that’s what we find.
When it is not the sealant
To be straight with you, some problems need a different trade:
- Condensation trapped between the panes
- A frame that has rotted at the joint
- Worn gaskets, brush seals or a door that has dropped
If in doubt, phone 0345 464 0079 or email us and we will say what we think before you book.
What we seal
- uPVC windows
- Patio & French doors
- Timber windows & doors
- Window sills
- Composite doors
- Aluminium frames