Greater London · England
Forty Hill Window Mastic
Mastic around window and door frames, sills and patio doors for householders, landlords and businesses in Forty Hill. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Leaking joints at the ends of sills
- Sealant in the wrong colour for the frame
- Cold air getting in at the frame edge
Signs you need window mastic in Forty Hill
Timber windows bring their own problems. Old mastic gets painted over and cracks under the paint, and timber moves with moisture as well as temperature.
Look out for any of the following:
- Damp patches on the reveal after heavy rain
- Draughts coming in around windows and doors
- Mastic that has split away from the wall
- Cracked sealant at the sill ends
Managing a site like Worcesters Primary School? Then the mastic around its windows and doors needs looking after like any other building’s.
Comparing quotes
- What happens if they find a problem under the old sealant
- How the surfaces are prepared before sealing
- The length of the guarantee
- How the colour is chosen
Window mastic for homes and businesses in Forty Hill
Homes in Forty Hill have every kind of window: uPVC, aluminium, timber and composite, along with patio doors, French doors and sills. Each gets a sealant chosen for the frame and the wall it meets. We work on composite doors, timber windows & doors and uPVC windows, and the jobs we see most are cracked or shrunken mastic around the frame and damp patches on the reveal after heavy rain.
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.
A 12-month guarantee comes as standard, so you’re not left on your own once the job is done.
- Location
- Forty Hill (EN1, EN2)
- Wider area
- Greater London
- Cover
- A year, on every job
- Quotes
- A clear price before work begins
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Nearby places to Forty Hill
More services for Forty Hill
Your questions about window mastic in Forty Hill
Is Forty Hill in your area for window mastic?
Yes. We work across London and the South East, and Forty Hill is part of that. You can ring 0345 464 0079 or drop us an email and let us know what needs doing.
Is parking an issue for window mastic in Forty Hill?
Parking in Forty Hill, as in most of London, takes a little planning: a visitor permit or a bay close to the door helps a lot, so mention what’s available when you book.
Do you seal inside as well as outside?
Yes. Plenty of draughts come through the inside joint as well as the outside, so sealing both is often worthwhile.
Do you have sealant for grey or black windows?
Usually, yes. Mention the frame colour when you ask for a quote and we will use the nearest match.
Are you fully insured?
Yes. We are fully insured.
Is the new sealant paintable?
Not if it’s silicone. We choose the product with your decorating in mind, so mention it when you book.
I’m a tenant. Can you help?
Yes. Ask your landlord first, and we can send them the quote if that helps.
Can new sealant go over the old?
No. The old sealant always comes out first.
DIY sealant or a professional job?
Sealing over old silicone is the commonest DIY error. New silicone will not bond to old, so it lifts and traps water and mould underneath. Everything old must be removed first.
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 to look after the new joints
A little care helps the new joints last. We recommend:
- Ventilate rooms so frames don’t stay wet inside
- Clean frames with a soft cloth and soapy water
- Keep paint and stain on wooden frames in good order
- Look round the frames every year or so
Silicone can’t normally be painted, so mention any painting plans before we start. We can use a paintable sealant where that matters.
Wet, windy weather is when failed mastic shows itself, but sealant goes on best when frames and walls are dry. Sorting cracked mastic early means the joint is sound before the bad weather.
Landlords, agents and businesses in Forty Hill
Housing providers, facilities teams and property managers book us too in Forty Hill and across Greater London. Several sites can be quoted together.
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
How we quote for window mastic
There’s no set price list, because jobs vary so much. What we look at:
- Access and height
- The old material and how stubborn it is
- When we can work, for business premises
- The number and length of the joints
A few things move the cost up or down: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether the work is at height. Your quote takes all of that into account.
Helping us quote
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- A few pictures by email, if you can
- The address or postcode of the job
- Whether it has been sealed before
- How many joints, rooms or windows are involved
We quote each job on its own, so start by telling us what you need. Just phone 0345 464 0079 or drop us an email with the details, and pictures are welcome.
Why deal with it now?
Resealing frames is a short job: it takes a few hours for a few frames, or a day or more for a whole house. Leave it until water is coming in and you may need plastering and decorating as well. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and once it shows in Forty Hill, the repair is bigger than a sealant job.
There are no prices on our website, because each job is priced on what it involves. For a quick quote, please phone 0345 464 0079 or send us an email.
Why choose Mr Mastic in Forty Hill
- Colour agreed with you before we start
- 180+ five-star Google reviews
- Over 20 years’ experience
- Full insurance on every job
Read our cost guide and customer reviews.
Frames and glazing around Forty Hill
With historic houses such as Forty Hall (about 0.3 miles north) nearby, there’s older building stock in the area around Forty Hill 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. In London conversions and blocks, the lease decides who is responsible for the frames, so it’s worth checking before booking.
Letting a property close to Turkey Street station? Then cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets. Homes close to Jesus Church include some older properties, and replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Forty Hill is about 1 mile north-east of Enfield, in Greater London. If you need window mastic in Forty Hill, it’s easy to get a quote: please phone 0345 464 0079 or send us an email. We cover Greater London from our Crawley base. 764 places in Greater London are on our list. We also work in London, about 12 miles from Forty Hill.
Our applicators cover all of EN1 and EN2 for window mastic. Local streets include Goat Lane, Acacia Road and Willow Road, and we cover them all. Close by, we work in Gordon Hill (1 mile west), Clay Hill (1 mile north-west), Bulls Cross (1 mile north), Enfield (1 mile south-west) and Bullsmoor (1 mile north-east). Within a short drive, we also cover London (12 miles south), City of Westminster (11 miles south), Marylebone (11 miles south), Kensington (13 miles south-west), St Pancras (10 miles south) and Shoreditch (10 miles south).
Around Forty Hill
In Forty Hill, that means homes and buildings near Chace Community School, Hop Poles pub and Russet House School, among other places. The nearest railway station is Turkey Street station, about 1 mile north-east of the centre. Other landmarks nearby include Edmonton Green Shopping Centre (2.9 miles south) and Museum of Enfield (1.2 miles south-west). The countryside around Forty Hill includes Fir and Pond Woods and Pole Hill.
What we do, step by step
When we arrive, we start by going over the job with you, so you know exactly what we are doing. Surfaces next to the work are protected before we start. Most jobs take anything from an hour or two to a full day, depending on how many frames there are. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. Mention any building rules, key holders or managing agents when you book.
- We start by checking each window and door with you.
- We remove the old mastic and clean the frame and the wall.
- Where gaps are deep, backing rod goes in first.
- New exterior sealant goes on in a matching colour and is tooled smooth.
- Finally we tidy up and check each joint.
Before we arrive
- On commercial sites, let us know about site rules
- Tell us about any previous sealing or DIY attempts
- Tell us if parking is tricky
How to get a quote
Need a quote? Please phone 0345 464 0079 or email us and tell us about the job. You’ll know what we plan to do, and what it will cost, before any work begins.