Greater London · England
Angel Window Mastic
Window mastic for Angel and the surrounding area: the right sealant, proper preparation and a neat finish. Call for a quick quote.
- Whistling draughts around closed windows
- Leaking joints at the ends of sills
- Sealant in the wrong colour for the frame
What affects the cost of window mastic
Your quote is based on your job. We take into account:
- Which sealant suits the joint
- Access and height
- How many rooms, windows or areas are involved
- The old material and how stubborn it is
Some things make a job bigger or smaller: the old material and how easily it comes out, whether mould needs treating, and whether the work is at height. We take all of that into account in your quote.
What to tell us for a quote
To help us quote quickly, let us know:
- The problem you’ve noticed
- Pictures of the joints, sent by email
- If someone has resealed it before
- How we’d reach the joints
Need a quote? Please ring 0345 464 0079 or drop us an email and tell us about the job. You will know what we plan to do, and what it will cost, before any work begins.
How we handle window mastic in Angel
Over two decades of sealing frames has taught us which products suit which walls. We’re fully insured ARBOMaster approved applicators, and we give a one-year guarantee on the work. If you have a bead that doesn’t match the frame and mastic that has split away from the wall, we can help, whatever the surface.
London has a lot of flats and conversions, where windows are often on upper floors. In a converted house or block, the lease usually says who is responsible for the windows, so it’s worth checking before booking.
We stand behind the work with a one-year guarantee, so you are not left on your own once the job is done.
- Where
- Angel (N1, N1P, EC1V)
- Wider area
- Greater London
- Cover
- 12 months on all our work
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
More services for Angel
Angel homes and the weather
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. In London conversions and blocks, the lease decides who is responsible for the frames, so check that before you book.
For landlords with property near London Kings Cross station, renewing tired window mastic between tenants heads off draught and damp complaints. In the older streets around St Mark's Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Angel is about 1 mile north-east of St Pancras, in Greater London. Across the N1 area, our applicators can take on window mastic. We cover 764 towns and villages across Greater London.
Postcode districts we cover here for window mastic: N1, N1P and EC1V. Window mastic is available to properties on City Road, Noel Road and Dewey Road and the roads around them. Angel sits on or near the A501. We also cover the places around Angel: Pentonville (1 mile north-east), Clerkenwell (1 mile south), Islington (1 mile north), St Pancras (1 mile south-west) and Kings Cross (1 mile west). We also work in nearby towns such as Kensington (5 miles south-west), Walthamstow (5 miles north-east), Hampstead (3 miles north-west), Ruislip (13 miles west), Brompton (4 miles south-west) and Stockwell (4 miles south).
Local landmarks in Angel
Locally, jobs take us to homes and businesses close to Risinghill School, Pilsudski Institute of London and The Angel pub and the streets around them. Nearby too are Barnard Park (under half a mile north-west) and Elizabeth Garrett Anderson School (within half a mile west). The closest station to Angel is London Kings Cross station, roughly 0.7 miles west. Other landmarks nearby include Finsbury Health Centre (0.5 miles south) and Museum of Funeral History (under half a mile south). Green spaces nearby include Barnsbury Wood and St. James's Park Lake.
Landlords, agents and businesses in Angel
Whether it’s one flat or a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a 12-month guarantee.
Mouldy or split sealant often shows up at the end of a tenancy. Several properties can be quoted together.
Signs you need window mastic in Angel
Joints that are too thin or too deep fail early. A skim of sealant over a wide gap soon tears, and a gap filled solid can’t flex. Backing rod sets the right depth.
Common reasons people contact us include:
- A bead that doesn’t match the frame
- Leaking joints at the ends of sills
- Whistling draughts around closed windows
- Rushed sealant from a window installation
As a London address, Angel can be tricky for parking: let us know about parking bays, permits or a driveway.
Comparing quotes
- The length of the guarantee
- Who does the work, and how experienced they are
- What happens if the job turns out different
- Whether all the old sealant comes out first
Different surfaces, different methods
Composite doors
Composite doors are normally hung in an uPVC-type frame, and the joint around it is sealed like a window. The bead is colour-matched to the frame.
Aluminium frames
Metal frames expand in the sun and are often slim, with little room for error. A neat, narrow bead in a colour to match suits the frame.
How to look after the new joints
Looking after new joints is easy, and it makes a real difference:
- Keep drainage slots and sill grooves clear
- Avoid blasting the frames with a pressure washer
- Walk round the house once a year and look at the joints
- Avoid harsh chemicals near the mastic
Timber frames need their paint kept up, because bare, wet timber moves more and pulls at the joint. Keep paint off the silicone itself.
Leaks usually show up in wet, windy weather, but sealant goes on best when frames and walls are dry. Dealing with it when you first notice a crack avoids chasing leaks through the wet months.
What we do, step by step
Once we’re on site, we compare the joints with what we discussed. If anything is different, we explain it before carrying on. Most jobs then take a few hours for a handful of frames, longer for a whole house. In Angel, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- Each frame is looked over and we agree which ones need resealing.
- We remove the old mastic and clean the frame edge and wall.
- Deep gaps get closed-cell backing rod to set the depth.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- Every joint is tooled smooth and checked before we leave.
Preparing for the visit
- Mention any tricky access
- Let us know if you’ve seen damp or leaks
- Plan for the work area to be out of bounds to pets and children
Get a quote
For window mastic in Angel, ring 0345 464 0079 or send us an email. Tell us what the problem is and where, and we’ll agree the price before any work begins.
Related advice
DIY sealant or a professional job?
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
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.
Angel: your questions answered
Can you help a landlord with a rental near London Kings Cross station?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. Just ring 0345 464 0079 or send us an email with the address and what needs doing, and we will give you a clear quote.
Is parking an issue for window mastic in Angel?
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.
Is it messy?
We keep the work tidy. Nearby surfaces are protected, and we clear up when we’re done.
Can I add another job to the visit?
Yes. Just list everything you need and we’ll quote it together.
Is the work guaranteed?
Yes. All our work carries a 12-month guarantee, and we’re ARBOMaster approved applicators.
How long does it take to reseal the windows on a house?
That depends on the number of frames, how they’re reached and the state of the old mastic. You will know the timing when we quote.
Can you do upstairs windows?
Yes, if safe access is possible. For high or awkward windows, we will tell you what access is needed.
How long should I leave it?
That depends on the sealant used, so please follow the time we give you.