Greater London · England
Window & door mastic in Sutton, Greater London
We cover Sutton for mastic around window and door frames, sills and patio doors. Old material cut out, joints cleaned and sealed neatly and every job guaranteed for a year.
- Draughty joints inside around the window
- Untidy mastic left by window fitters
- Draughts coming in around windows and doors
Window mastic in Sutton, done properly
Mr Mastic’s applicators have more than 20 years’ experience with window and door sealants. We’re fully insured ARBOMaster approved applicators, and every job is covered by a 12-month guarantee. Common call-outs are for draughty joints inside around the window and gaps left after new windows were fitted, on window sills, composite doors and uPVC windows.
London has a lot of flats and conversions, where windows are often on upper floors. In a converted house or block, the lease generally says who is responsible for the windows, so it’s worth checking before booking.
There’s a 12-month guarantee on every job, whatever its size.
- Place
- Sutton (SM1, SM2, SM3, SM7)
- Region
- Greater London
- Guarantee
- 12 months on all our work
- Price
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Questions from Sutton
Do you work for landlords with property near Sutton (London) station?
Yes. We work for landlords and letting agents as well as homeowners, and several properties can be quoted together. You can ring 0345 464 0079 or drop us an email with the details for a clear quote.
Is parking a problem for a job in Sutton?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot.
Is there any odour?
That depends on the sealant. Some products have a noticeable smell, others very little.
Is it worth trying it myself?
Sometimes. Preparation is everything: all the old sealant out, and a clean, dry joint. We can always put it right if it fails.
Is it OK to seal over old sealant?
No, it will not last. It can look neat for a few weeks, but the new bead soon lifts. Removing the old sealant completely is the only lasting way.
Do you work on first-floor windows?
Yes, where it’s safe. Higher or awkward frames may need extra access, and we will confirm what’s needed.
Will the old sealant be removed?
Always. Sealing over the old bead is the commonest cause of early failure, and it’s something we never do.
Do you have sealant for grey or black windows?
Yes. White, brown, anthracite grey, black and clear sealants are all available.
What we do, step by step
When we arrive, we start by going over the job with you, so there are no surprises. Surfaces next to the work are protected before any work begins. Most jobs take a few hours for a handful of frames, longer for a whole house. For a job in Sutton, parking and access are the things to plan: let us know about parking, the floor we’ll be working on and any lift or shared entrance.
- First we look at every frame and agree the list.
- Next the failed sealant is cut away and the joint cleaned.
- We fit backing rod in deep gaps so the sealant is the right depth.
- A flexible, weatherproof sealant is applied in a colour to suit the frame.
- Every joint is checked before we leave.
Getting ready for the visit
- Plan for the work area to be out of bounds to pets and children
- Move anything stored near the joints
- Tell us if parking is tricky
Ask for a quote
It all starts with a short chat. Describe the problem, the location and the size of the job, and we’ll explain how we’d tackle it. When it suits you, call 0345 464 0079 or send us an email.
Related advice
How the job changes by surface
Window sills
Sills catch the water running down the glass, so the sill ends and the joint under the frame are vital. They’re cut out and resealed with exterior sealant.
Aluminium frames
Aluminium needs a sealant that bonds to coated metal, and acetoxy silicones aren’t used, as they can attack some metals. We use a neutral-cure product.
How we quote for window mastic
Every job gets its own quote. This is what makes a difference:
- Whether old sealant or filler has to be cut out
- How many rooms, windows or areas are involved
- Any mould that needs treating
- The size of the job
Rather than a set price list, we look at what your job involves: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
What to tell us for a quote
You do not need to know the technical terms. Just tell us:
- Whether it’s a home or a business
- Pictures of the joints, sent by email
- If someone has resealed it before
- Where the job is, and your postcode
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 email pictures if that is easy.
When it isn’t the sealant
Honest advice matters more to us than a booking, so here’s what new sealant will not do:
- A door that needs adjusting, rehanging or new seals
- Damp problems in the wall away from the window
- A failed sealed unit that has misted up
Not sure which it is? You can ring 0345 464 0079 or email us and we will tell you honestly before you book.
What we seal
- Aluminium frames
- Patio & French doors
- Composite doors
- Timber windows & doors
- uPVC windows
- Window sills
Work for landlords, hotels and businesses
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.
Housing providers, facilities teams and property managers book us too in Sutton and across Greater London. Several sites can be quoted together.
Looking after it afterwards
Looking after new joints is easy, and it makes a real difference:
- Do not aim a pressure washer at the joints
- Paint up to the joint, not over it
- Check the mastic once a year
- Keep solvents and bleach off the sealant
Most silicone sealants won’t take paint, so mention any painting plans before we start. We can use a paintable sealant where that matters.
A failed joint lets water into the wall a little at a time. Often the first sign is a damp patch inside or flaking paint on the reveal. Early resealing stops it reaching that point.
Places near Sutton
More services for Sutton
Frames and glazing around Sutton
In London conversions and blocks, the lease decides who is responsible for the frames, so check that before you book. Historic houses like Nonsuch Mansion (about 1.6 miles west) are a reminder that the area around Sutton has older buildings as well as new. 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.
As a London address, Sutton can be tricky for parking: let us know about parking bays, permits or a driveway. If you look after a building such as Robin Hood Junior School, larger buildings have plenty of frames, and the mastic around each one ages. Letting a property close to Sutton (London) station? Then sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
Sutton is about 9 miles south of Kensington, in Greater London. Our applicators cover window mastic for homes and businesses in Sutton. Across Greater London, we cover 764 places, and Sutton is one of them. We also work in London, around 10 miles away.
Here we cover the SM1, SM2, SM3 and SM7 postcode area for window mastic. That includes homes and businesses on High Street, Manor Place and St Nicholas Way and the roads around them. Being close to the B2230, Sutton is simple for us to get to. Other places close to Sutton include Benhilton (1 mile north), Carshalton (1 mile east), Shanklin Village (1 mile south), St Helier (1 mile north) and Rosehill (1 mile north). Larger places within reach include London (10 miles north-east), City of Westminster (10 miles north), Marylebone (11 miles north), Kensington (9 miles north), St Pancras (12 miles north) and Shoreditch (12 miles north-east).
Near you in Sutton
Locally, jobs take us to homes and businesses close to Sutton Grammar School, The Grapes pub and Manor Park. Sutton has its own railway station: Sutton (London) station. Nearby you will also find St Helier Hospital (1.1 miles north-east) and Honeywood Museum (1.3 miles east). Green spaces nearby include Devonshire Avenue Nature Area and Duppas Hill.
What happens if it’s left?
If you’re painting or rendering, reseal at the same time. Fresh joints finish the job neatly. In London conversions, one flat’s bathroom is often above another flat’s ceiling, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Dealing with it early is far simpler.
Homes and businesses are quoted the same way: the amount of work, how we reach it and what it needs, along with when we can work on site. Ask us for a quote and we’ll explain what it covers.
Why us?
- We are fully insured
- You choose the colour before work begins
- White, clear, grey or coloured to suit, where the product allows
- Any old sealant cut out fully, not covered over