East Sussex · England
Window & door mastic in Offham, East Sussex
Mastic around window and door frames, sills and patio doors in Offham, with a 12-month guarantee on every job. Call for a quick quote.
- Mastic that has split away from the wall
- Gaps between the frame and the inside reveal
- A bead that does not match the frame
How we handle window mastic in Offham
Around Offham we seal all kinds of frames: from uPVC casements to timber and aluminium, along with patio doors, French doors and sills. The sealant is chosen to suit the frame material and the wall. If you’re dealing with old mastic that has gone black or come away and gaps between the frame and the inside reveal, we can put it right.
Mastic can only go onto a dry, clean joint, so window work in Offham is booked around the forecast. Tell us about access to every side of the house, including upper-floor windows.
We guarantee the work for a year. If something is not right with it in that time, tell us and we’ll put it right.
- Place
- Offham (BN7)
- Region
- East Sussex
- Cover
- 12 months on all our work
- Price
- A clear price before we start
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
What we do, step by step
You don’t need to clear the whole room or building, just the space around the work. Everything nearby is protected, and the work takes anything from an hour or two to a full day, depending on how many frames there are in most cases. In a small place like Offham, access is normally the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- We start by checking each window and door with you.
- We remove the old mastic and clean the frame and the wall.
- We fit backing rod in deep gaps so the sealant is the right depth.
- We apply a weatherproof sealant to match the frame and tool it neatly.
- Every joint is checked before we leave.
Preparing for the visit
- Mention any sign-in or site rules at work premises
- Let us know about stairs, lifts or work at height
- Let us know about earlier repairs to the joints
How to get a quote
There’s no standard price list, because every job is different. Instead, your job gets its own clear quote. To arrange one, phone 0345 464 0079 or send us an email.
Related advice
Offham: your questions answered
Is Offham in your area for window mastic?
Yes, Offham is within the area we cover. We work across London and the South East. Just call 0345 464 0079 or drop us an email with a few details of the job.
Is Offham within the area you cover?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Will the old sealant be removed?
Yes. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.
Can resealing stop a draught around my window?
Yes, if the air is getting in around the frame. If it’s through the window’s own seals or a hinge, that is a different fix, and we’ll say so.
Are you insured?
Yes. We are fully insured for every job we do.
Will there be a smell?
Sometimes, a little. It fades as the sealant cures, and ventilation helps.
Can landlords and businesses book you?
Yes. As well as householders, we work for landlords, agents, businesses and hotels in Offham.
Is it messy?
Not at all. The area is protected while we work and cleaned up afterwards.
What the job involves on each surface
Composite doors
If the door itself is draughty, the issue may be the door seals or hinges rather than the frame mastic. We seal the frame and let you know about anything else.
Timber windows & doors
Wood swells when it’s wet and shrinks when it dries, so the joint must stay flexible. The paint or stain needs to be sound where the sealant meets it.
Towns and villages near Offham
More services for Offham
Windows and doors in Offham
With historic houses such as Anne of Cleves House (about 1.7 miles south-east) nearby, there’s older building stock in the area around Offham as well as newer homes. 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. The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Rented homes near Cooksbridge station change hands often, and cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets. If you look after a building such as Wallands Community Primary School, larger buildings have plenty of frames, and the mastic around each one ages.
Offham is about 1 mile north-west of Lewes, in East Sussex. Whether you’re in the middle of Offham or further out, we cover window mastic for every kind of property. Across East Sussex, we cover 289 places, Offham among them. You can also see our page for Brighton, roughly 7 miles from Offham.
All of BN7 is within our area for window mastic, from the main roads to the quietest streets. We also cover Hamsey (1 mile north-east), Lewes (1 mile south-east), South Malling (1 mile south-east), Southover (2 miles south-east) and Cliffe (2 miles south-east). We also work in nearby towns such as Eastbourne (15 miles south-east), Seaford (10 miles south-east), Hailsham (12 miles east), Crowborough (14 miles north-east), Uckfield (7 miles north-east) and Newhaven (7 miles south).
Local landmarks in Offham
In Offham, that means homes and buildings near Railway Land, The Blacksmiths Arms and Lewes Old Grammar School, among other places. The nearest railway station is Cooksbridge station, roughly 0.9 miles north. Well-known places in the area include Brighton And Hove Albion Football Club Museum (3.8 miles south-west) and Lewes Castle (1.5 miles south-east). Open spaces near Offham include Malling Down and Offham Hill.
Signs you need window mastic in Offham
Timber windows bring their own problems. Old mastic gets painted over and cracks under the paint, and the wood moves with damp as well as heat.
Keep an eye out for any of the following:
- Gaps left after new windows were fitted
- Whistling draughts around closed windows
- Cracked internal joints between frame and plaster
- Damp patches on the reveal after heavy rain
If you live in an older home near Church of St Peter, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Comparing quotes
- Whether they’re fully insured
- Whether the sealant suits the joint
- How the surfaces are prepared before sealing
- Who turns up on the day
What affects the cost of window mastic
We quote each job individually. This is what makes a difference:
- Mould in or behind the old joints
- The number of rooms or windows
- The old material and how stubborn it is
- How easy the joints are to reach
Leaving a failed joint generally makes the job bigger, not smaller. If you are unsure, phone 0345 464 0079 or email us and we’ll give you an honest view and a quote.
What to tell us for a quote
What to tell us when you ask for a quote:
- Pictures of the joints, sent by email
- Whether it’s a home or a business
- Any previous sealing or DIY work
- What’s wrong with the joints now
Every job is quoted individually, so the first step is telling us about yours. Just call 0345 464 0079 or send us an email with the details and send photos if you have them.
Can I do it myself?
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
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.
What sealant work cannot fix
We’d rather tell you now than do work that will not last, so here’s what sealant can’t put right:
- Condensation trapped between the panes
- Draughts through the window seals rather than the frame
- Damp coming through the wall itself rather than the frame joint
If you are not sure, just phone 0345 464 0079 or drop us an email and we’ll give you a straight answer before booking.
Joints and surfaces we work on
- uPVC windows
- Aluminium frames
- Timber windows & doors
- Patio & French doors
- Window sills
- Composite doors
Looking after it afterwards
Looking after new joints is easy, and it makes a real difference:
- Clean frames with a soft cloth and soapy water
- Repaint timber before it’s bare
- Avoid blasting the frames with a pressure washer
- Keep drainage slots and sill grooves clear
A yearly look round the frames is enough. Cracks and lifting edges are easy to spot early, and if anything looks wrong, just call 0345 464 0079 or drop us an email.
Leaks normally show up in wet, windy weather, but sealant goes on best when frames and walls are dry. Sorting cracked mastic early means the joint is sound before the bad weather.