East Sussex · England
Down Street Window Mastic
Our applicators work in Down Street 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.
- Black, perished sealant on frames
- Gaps left after new windows were fitted
- Draughts coming in around windows and doors
The process
We bring everything the job needs with us, so you do not need to buy or prepare anything. After a quick look at the joints together, we protect the area and start. Most jobs take most of a day for a typical house, less for a few frames. In a small place like Down Street, access is usually the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- First, we confirm safe access to each frame.
- Old, cracked mastic is removed completely, along with any loose debris.
- Frame and wall are cleaned and must be dry before sealing, and primed where the sealant calls for it.
- Deep voids are backed, then the sealant is gunned in.
- The joint is shaped to shed water and the area tidied.
Getting ready for the visit
- Plan for the work area to be out of bounds to pets and children
- Tell us about any water getting in
- Move anything stored near the joints
Getting a quote
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints.
Related advice
Window mastic in Down Street
A window frame and the wall around it expand and shrink at different rates. Heat and cold make frames grow and shrink against brick or render that hardly moves. So the sealant has to stretch and recover, which is why we use a low-modulus product. Common call-outs are for gaps left after new windows were fitted and gaps where the sill meets the wall, across uPVC windows, patio & French doors and window sills.
Somewhere as small as Down Street, older homes often have timber frames set in stone or brickwork. Not every older frame suits a modern silicone bead, and sometimes a traditional sand mastic is the better choice.
You’re covered for a year from the day we finish. If anything isn’t right with it, call 0345 464 0079 or email us.
- Place
- Down Street (TN22)
- Region
- East Sussex
- Cover
- One year on every job
- Quotes
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Down Street: your questions answered
Can you do window mastic in Down Street?
Yes, Down Street is within the area we cover. Our work covers London and the South East. You can phone 0345 464 0079 or email us and let us know what needs doing, and we will give you a clear quote.
I let a flat near Uckfield station. Can you help?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. You can ring 0345 464 0079 or email us with the details for a clear quote.
Are you ARBOMaster approved?
Yes. We are an ARBOMaster approved applicator, the approved applicator scheme for Arbo sealants.
Where is Mr Mastic based?
Our base is in Crawley, and we cover South East England, London and all of Scotland.
Do you seal inside as well as outside?
Yes. Outside is the weather seal; inside closes the gap to the plaster. We do one or both.
Is it messy?
Very little: the area around the joints is protected first, and we tidy up before we go.
Will the old sealant be removed?
Yes, always, and completely. New silicone doesn’t stick to old silicone, so the joint is cleaned back first.
Can new window sealant be painted?
Silicone generally will not take paint. Let us know beforehand, and we’ll use a paintable product where it suits.
Should I try it myself first?
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions, then guaranteed for a year.
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
What affects the quote in Down Street
Some jobs are bigger than they look, and some smaller. What affects the quote:
- The product the joint needs
- The amount of work
- The old material and how stubborn it is
- Access and height
Every job is a little different, so each one gets its own quote. Size, access and the product the joint needs all make a difference, and we will explain the quote if you ask.
What we need to know
You don’t need to know the technical terms. It helps if you can tell us:
- Pictures of the joints, sent by email
- How we’d reach the joints
- What’s wrong with the joints now
- Whether it’s a home or a business
Want a quote for window mastic? Please ring 0345 464 0079 or drop us an email and tell us about the job. We will explain what we’d do and send you a clear quote before any work starts.
Looking after it afterwards
No joint lasts for ever, but care makes a real difference. Our tips:
- Walk round the house once a year and look at the joints
- Air rooms to keep condensation down around windows
- Keep jet washers away from the mastic
- Make sure the drainage slots aren’t blocked
Keep the new mastic undisturbed while it cures, for as long as we advise. Keep jet washers away from the frames.
Wet, windy weather is when failed mastic shows itself, 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.
Landlord and commercial work in Down Street
In hotels, rooms out of use cost money, so the work can be planned room by room. Hotel work is part of what we do, alongside homes and businesses.
Landlords and agents in Down Street can book us as well as householders. Resealing between tenancies keeps a property looking cared for before the next move-in.
Signs you need window mastic in Down Street
Timber windows bring their own problems. Mastic painted over many times cracks with the paint, and the wood moves with damp as well as heat.
The most common problems we see are:
- Whistling draughts around closed windows
- Gaps left after new windows were fitted
- Rain getting in at the frame or under the sill
- Gaps where the sill meets the wall
In the older streets around The Parish Church of St Andrew and St Mary, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Questions to ask before booking
- What the cure time is
- What the quote includes, VAT included or not
- How the joint is cleaned and prepared
- What product goes in the joint
Nearby places to Down Street
More services for Down Street
Down Street homes and the weather
London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Rented homes near Uckfield station change hands often, and renewing tired window mastic between tenants heads off draught and damp complaints. Schools such as Fletching Church of England Primary School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s.
Down Street is about 3 miles north-west of Uckfield, in East Sussex. Wherever you are in the TN22 postcode area, our applicators can take on window mastic. Across East Sussex, we cover 289 places, Down Street among them. For nearby work, see our Crawley page, about 13 miles away.
Postcode districts we cover here for window mastic: TN22. Other places close to Down Street include Maresfield (1 mile east), Budlett's Common (2 miles east), Newick (3 miles south-west), Founthill (3 miles south-west) and Ridgewood (3 miles south-east). We also work in nearby towns such as Seaford (15 miles south), Lewes (9 miles south), Hailsham (13 miles south-east), Crowborough (6 miles north-east), Uckfield (3 miles south-east) and Newhaven (14 miles south).
Landmarks near Down Street
Typical jobs here are in homes near West Park and the streets around them. The nearest railway station is Uckfield station, about 2.6 miles south-east of the centre. Nearby you will also find Uckfield Community Hospital (3 miles south-east) and Heaven Farm Museum (2.8 miles north-west). Open spaces near Down Street include Brickfield Meadow.
Different surfaces, different methods
Aluminium frames
Coated aluminium needs a compatible sealant. Neutral-cure sealant is the safe choice.
Composite doors
Front doors take the weather head on, and the top and bottom corners tend to fail first. We pay most attention there.