East Sussex · England
Window Mastic in Lewes
Professional window mastic in and around Lewes, with every bit of old sealant taken out first.
- Cracked internal joints between frame and plaster
- Gaps where the sill meets the wall
- A bead that does not match the frame
Honest limits
In fairness, some problems need a different trade:
- A frame that has rotted at the joint
- Misting between the panes of a double-glazed unit (that needs a new unit)
- Faulty window hardware
Not sure which it is? You can phone 0345 464 0079 or drop us an email and we’ll tell you honestly.
Joints and surfaces we work on
- uPVC windows
- Aluminium frames
- Window sills
- Timber windows & doors
- Composite doors
- Patio & French doors
Window mastic in Lewes, done properly
The new joint doesn’t have to be white. White, brown, anthracite grey, black and clear sealants are all available, so the bead blends with the window rather than framing it. If you’re dealing with draughts coming in around windows and doors and rushed sealant from a window installation, we can help, whatever the surface.
Lewes mixes older streets, where windows have often been replaced, with newer estates fitted with uPVC. All of them depend on a sound bead of mastic between frame and wall.
We stand behind the work with a one-year guarantee.
- Place
- Lewes (BN7, BN8, BN6, RH15)
- Region
- East Sussex
- Guarantee
- 12 months on all our work
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
DIY versus a professional finish
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
A DIY attempt does not rule out a professional job. We remove it and do the joint properly, so tell us about it when you ask for a quote.
FAQs for Lewes
Is Lewes in your area for window mastic?
Yes, Lewes is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or drop us an email and let us know what needs doing, and we’ll send you a clear quote.
I let a flat near Lewes station. Can you help?
Yes. We work for landlords and agents as well as householders. You can call 0345 464 0079 or email us with the details for a clear quote.
Is there any odour?
Sometimes, a little. Any smell clears as the sealant cures.
How do I get a quote for window mastic in Lewes?
The cost depends on the size of the job, access and how much old sealant has to come out. Ask us for a quote.
Are you ARBOMaster approved?
Yes. We hold ARBOMaster approved applicator status, and we are fully insured.
Where are you based?
We’re a Crawley-based firm, with over 20 years’ experience. Our area covers South East England, London and Scotland.
Can you do several jobs on one visit?
Yes, we can. Several rooms, windows or areas can go on one quote.
Do you work on first-floor windows?
Normally, yes. Access is planned before we start, so mention the height and anything in the way.
Keeping the joints in good condition
Simple care keeps the joints in good condition. Our advice:
- Don’t paint over the silicone
- Avoid harsh chemicals near the mastic
- Keep jet washers away from the mastic
- Air rooms to keep condensation down around windows
Try not to touch the new joint while it cures, for as long as we advise. 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 early resealing is worth it.
Landlords, agents and businesses in Lewes
We regularly work with letting and managing agents. Tell us the address, the job and how access works and we will quote.
From a single let to a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a 12-month guarantee.
What affects the quote in Lewes
There’s no set price list, because no two jobs are the same. The quote depends on:
- Any mould that needs treating
- The number and length of the joints
- Access and height
- How many rooms, windows or areas are involved
Homes and businesses are quoted the same way: the amount of work, the access and the products needed. Call for a quick quote and we will explain what it covers.
What we need to know
When you call or email, these details help:
- Whether it has been sealed before
- The problem you’ve noticed
- How many joints, rooms or windows are involved
- Photos by email, if that’s easy
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.
What happens on the day
Good joint work is mostly preparation, and we don’t rush it. Every joint is cleaned and dried before new material goes in. All told, the work takes a few hours for a few frames, or a day or more for a whole house. For a job in Lewes, we need access to where the work is and somewhere nearby to park. If the job is outside, mention gates, side access and anything above ground floor.
- We check each frame and agree which ones need doing.
- The old mastic is cut out and the surfaces cleaned back.
- We fit backing rod in deep gaps so the sealant is the right depth.
- New exterior sealant goes on in a matching colour and is tooled smooth.
- Finally we tidy up and check each joint.
Preparing for the visit
- Tell us about any previous sealing or DIY attempts
- Try not to wet indoor joints just before the visit
- Plan for the work area to be out of bounds to pets and children
Getting a quote
Want a quote for window mastic? Please call 0345 464 0079 or email us with a few details. We’ll explain what we’d do and send you a clear quote before we start.
Advice
What we’re called out for in Lewes
Mastic ages in the weather. Sunlight dries the surface out, until it loses its stretch and starts to crack.
Most people get in touch after spotting something like this:
- Black, perished sealant on frames
- Gaps where the sill meets the wall
- Cold air getting in at the frame edge
- Hard, cracked sealant around windows
For an older house near a landmark such as Church of St John sub Castro, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
What your quote should include
- Whether VAT is included
- What guarantee comes with the work
- When the joint can take water or movement
- What insurance they hold
More services for Lewes
Lewes homes and the weather
Historic houses like Anne of Cleves House (about 0.6 miles south) are a reminder that the area around Lewes 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, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Rented homes near Lewes 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. For site and facilities teams at buildings such as Lewes Old Grammar School, its window and door frames need their mastic kept sound, just like a home’s.
Lewes is about 7 miles north-east of Brighton, in East Sussex. Homes, rented property, offices and hotels in Lewes is covered for window mastic. The work is guaranteed for a year. Lewes is one of 289 places in East Sussex we cover for window mastic. You can also see our page for Brighton, about 7 miles away.
We work across the BN7, BN8, BN6 and RH15 postcode area for window mastic and the streets around it. Local streets include Market Lane, Market Street and High Street, all of which we cover. Lewes sits on or near the A26 and A275, which makes travel easy. We also cover the places around Lewes: South Malling (1 mile north-east), Southover (1 mile south-east), Cliffe (1 mile east), Offham (1 mile north-west) and Hamsey (1 mile north). Within a short drive, we also cover Eastbourne (14 miles south-east), Seaford (8 miles south-east), Hailsham (11 miles east), Crowborough (14 miles north-east), Uckfield (8 miles north-east) and Newhaven (6 miles south). Lewes is one of the larger places we cover in East Sussex.
What’s near Lewes
Around Lewes, our work takes us to homes and buildings near Priory School, St Pancras Catholic Primary School and Railway Land. For rail, the closest station is Lewes station, about 0.6 miles south-east. A little further out are Lewes Victoria Hospital (0.5 miles west) and Museum of Agricultural Bygones (3.9 miles east). For a walk, there’s Offham Hill and Malling Down.