Essex · England
Start Hill Window Mastic
Our applicators work in Start Hill on mastic around window and door frames, sills and patio doors. Old sealant removed completely, joints prepared properly and every job guaranteed for a year.
- Water coming in at the bottom corners of a door
- Draughty joints inside around the window
- White mastic on grey or black frames
Why deal with it now?
Draughts and leaks don’t always mean new windows. Where the frames are sound, new mastic normally deals with draughts and leaks at the edges. If we find failed glass units or worn seals, we will tell you. In a small place like Start Hill, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
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. Your quote takes all of that into account.
Why book with us
- A choice of colours where the product allows
- 4.9 on Google from 180+ five-star reviews
- We leave the area clean and tidy
- A sealant colour to suit the surroundings
Take a look at how sealant jobs are priced and our reviews.
Window mastic in Start Hill, done properly
Frames and walls don’t move together. Heat and cold make frames grow and shrink against brick or render that hardly moves. That’s why the joint needs a flexible, low-modulus sealant rather than something rigid. We are often asked to deal with cracked sealant at the sill ends and cracked internal joints between frame and plaster, across uPVC windows, timber windows & doors and window sills.
Homes in small places like Start Hill often stand in the open, with little to shelter their windows from wind and rain. That exposure dries out and cracks the mastic around frames and sills faster.
All of our work is guaranteed for twelve months, in Start Hill and everywhere else we cover.
- Place
- Start Hill (CM22)
- Wider area
- Essex
- Guarantee
- 12 months on all our work
- Quotes
- A clear price before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Nearby places to Start Hill
Other services in Start Hill
Different surfaces, different methods
Window sills
The end joints of a sill tend to fail before the rest. We reseal them so rain cannot run into the wall.
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.
Aftercare tips
Looking after new joints is easy, and it makes a real difference:
- Clear any debris from frame drain holes
- Air rooms to keep condensation down around windows
- Clean frames with a soft cloth and soapy water
- Look round the frames every year or so
Try not to touch the new joint while it cures, following the cure time we give you. Don’t point a pressure washer at the joints.
On timber windows, water behind the joint can lead to rot. Once wood has rotted, it needs repair before it can be sealed, so it pays to reseal before that happens.
When to call us in Start Hill
Sills take more water than any other part of a window, so the sill ends and the joint below the frame are common leak points. Failed sealant there lets rain into the wall or behind the frame.
These are the problems we’re asked about most:
- Cracked or shrunken mastic around the frame
- Gaps where the sill meets the wall
- A bead that doesn’t match the frame
- Mastic that’s falling out in pieces
Barrington Hall, about 2.8 miles south-east, is one of the historic houses in the wider area around Start Hill.
Comparing quotes
- Whether they’re fully insured
- How hidden problems are handled
- Is the old sealant removed completely?
- How long to leave it before use
Should I try it myself first?
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is.
When something else is needed
Some problems need a builder, plumber or other trade rather than us:
- Damp problems in the wall away from the window
- Worn gaskets, brush seals or a door that has dropped
- A failed sealed unit that has misted up
Not sure which it is? You can ring 0345 464 0079 or send us an email and we’ll tell you honestly.
What we seal
- Aluminium frames
- Window sills
- Patio & French doors
- Composite doors
- uPVC windows
- Timber windows & doors
What happens on the day
There’s no need to move everything out, only the area right around the joints. Everything nearby is protected, and the work takes a few hours for a few frames, or a day or more for a whole house for a typical job. Somewhere as small as Start Hill, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- 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.
- We tool each bead neatly and check every joint is closed.
How to prepare
- On commercial sites, let us know about site rules
- Mention if the joints have been sealed before
- For indoor joints, keep the area dry beforehand if you can
Getting a quote
Want a quote for window mastic? Please ring 0345 464 0079 or send us an email and tell us about the job. We will explain what we’d do and send you a clear quote before we start.
Related advice
Frames and glazing around Start Hill
Historic houses like Barrington Hall (about 2.8 miles south-east) are a reminder that the area around Start Hill 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 is traditional sand mastic. The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Letting a property close to Bishops Stortford station? Then cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets. Managing a site like Birchwood High School? Then larger buildings have plenty of frames, and the mastic around each one ages.
Start Hill is about 2 miles east of Bishop's Stortford, in Essex. Across the CM22 area, we cover window mastic for homes and businesses. Start Hill is one of 644 places in Essex where we work. We also work in Chelmsford, about 15 miles from Start Hill.
All of CM22 is within our area for window mastic, from the main roads to the quietest streets. If you need window mastic at a property on Start Hill and Provenance Close or a nearby road, our applicators can take on the job. We also cover Bedlar's Green (1 mile south), Takeley Street (2 miles east), Burton End (2 miles north), Takeley (2 miles east) and Smith's Green (3 miles east). We also work in nearby towns such as Chelmsford (15 miles south-east), Braintree (15 miles east), Harlow (8 miles south-west), Saffron Walden (11 miles north), Waltham Abbey (15 miles south-west) and Great Dunmow (6 miles east).
Local landmarks in Start Hill
We work in homes and buildings around The Three Willows pub, among other places. For rail, the closest station is Bishops Stortford station, about 1.9 miles west. Well-known places in the area include House On The Hill Toy Museum (2.4 miles north) and Moated mound (4.5 miles west). Open spaces near Start Hill include Portingbury Hills and Rushy Mead.
Start Hill questions
I let a flat near Bishops Stortford station. Can you help?
Yes, we work for landlords and agents. Just ring 0345 464 0079 or drop us an email and tell us about the property, and we will send you a clear quote.
Do you cover Start Hill for window mastic?
Yes. Our work covers London and the South East, and Start Hill is part of that. Just ring 0345 464 0079 or send us an email with a few details of the job.
Can new window sealant be painted?
Not if it’s silicone. Tell us your decorating plans and we will pick a sealant to suit.
Do I need to be at home?
Access is agreed with you when the job is booked. For inside work, that normally means someone being in.
Should I try DIY first?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Do you hold any approvals?
Yes. Mr Mastic is an ARBOMaster approved applicator and we are fully insured too.
Do you work for hotels and businesses?
Yes. We work in offices, washrooms, hotels and other commercial premises, as well as homes. Working times can be discussed when we quote.
Can resealing stop a draught around my window?
It will if the frame joint is the problem. We find where the air is coming from before we reseal.