East Sussex · England
Window Mastic in Sidley
Mastic around window and door frames, sills and patio doors in Sidley, with a one-year guarantee on every job. Call for a quick quote.
- Gaps left after new windows were fitted
- Whistling draughts around closed windows
- Old mastic that has gone black or come away
Window mastic in Sidley
Behind a thin line of old mastic there’s sometimes a deep void. Packing it solid with sealant gives a joint that can’t flex, so we fit backing rod to set the right depth. The sealant then grips the two sides it should. If you have mastic that has split away from the wall and cold air getting in at the frame edge, we can put it right, whatever the surface.
In smaller places like Sidley, homes range from older cottages to newer houses, with windows to match: timber, uPVC and aluminium. The right sealant depends on the frame and on what it sits in.
All of our work is guaranteed for twelve months, and the guarantee is the same wherever you are.
- Place
- Sidley (TN39, TN40)
- Wider area
- East Sussex
- Guarantee
- One year on every job
- Quotes
- A clear quote up front
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
What happens if it’s left?
A cracked joint around a frame lets rain into the wall. Left long enough, it can stain inside walls, spoil plaster and rot wooden frames. A reseal is a much smaller job. In an older home around Sidley, damp from a failed joint can get into timber and plaster, and that’s a much bigger job than renewing the sealant.
No two jobs are quite the same, so each one gets its own quote. Size, access and the product the joint needs all play a part, and we will explain the quote if you ask.
Why choose Mr Mastic in Sidley
- A 12-month guarantee on all work
- ARBOMaster approved applicator
- We leave the area clean and tidy
- White, clear, grey or coloured to suit, where the product allows
Keeping the joints in good condition
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Avoid blasting the frames with a pressure washer
- Avoid harsh chemicals near the mastic
- Use gentle cleaners on frames and sealant
- Keep timber frames painted
On timber frames, keep the paintwork in good order, because bare, wet timber moves more and pulls at the joint. Keep paint off the silicone itself.
Water gets in quietly when mastic fails. You might not see it until plaster blows or a damp patch appears inside. Catching it early keeps the fix to a reseal.
When to call us in Sidley
Older frames were often sealed with products that set hard. Once it’s rigid, every bit of frame movement pulls at it, and a gap opens along one edge.
Most people get in touch when they notice something like this:
- White mastic on grey or black frames
- Mastic that’s falling out in pieces
- Damp patches on the reveal after heavy rain
- Whistling draughts around closed windows
Managing a site like All Saints Church of England Primary School? Then its window and door frames need their mastic kept sound, just like a home’s.
Comparing quotes
- Whether the sealant suits the joint
- Whether all the old sealant comes out first
- How the joint is cleaned and prepared
- Are they insured?
What we do, step by step
On the day, we start by going over the job with you, so there are no surprises. Surfaces next to the work are protected before we start. Most jobs take a morning for a couple of windows and a door. For a job in Sidley, we agree the time, the access and parking before the day. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- First, we go round the frames with you and agree the list.
- We remove the old mastic and clean the frame edge and wall.
- Deep gaps get closed-cell backing rod to set the depth.
- A flexible exterior sealant is applied in a colour to suit the frame.
- Every joint is tooled smooth and checked before we leave.
How to prepare
- Let us know if you’ve seen damp or leaks
- Tell us about any previous sealing or DIY attempts
- Mention any parking rules near the property
Get 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.
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Towns and villages near Sidley
More services for Sidley
FAQs for Sidley
I let a flat near Bexhill station. Can you help?
Yes, rental work is part of what we do. Just call 0345 464 0079 or drop us an email and tell us about the property, and we will give you a clear price.
Do you cover smaller places like Sidley?
Yes, Sidley is covered. We work across London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Do you hold any approvals?
Yes. We are ARBOMaster approved, the scheme for applicators of Arbo sealants.
Can you seal over the old sealant?
No. The old sealant always comes out first, so the new sealant bonds properly.
Is the new sealant paintable?
Most silicone can’t be painted. If you plan to paint, tell us first and we can use a paintable sealant where it suits the joint.
What do you put in the joint?
The product depends on the job: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. We use products from Arbo and Everbuild.
Can you do the inside joint as well?
Yes. Plenty of draughts come through the inside joint as well as the outside, so it can be worth sealing both.
How much does window mastic cost in Sidley?
Every job is different, so each one gets its own quote. To get one, ring 0345 464 0079 or send us an email with a short description of the job.
Can I do it myself?
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.
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
Frames and glazing around Sidley
Sidley is close to the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. That’s hard on the mastic around window and door frames, especially on the side facing the sea. Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
If you let a flat or house near Bexhill station, sound mastic around windows and doors keeps out the draughts and damp that tenants notice first. If you live in an older home near Church of All Saints, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Sidley is about 1 mile north of Bexhill-on-Sea, in East Sussex. Anywhere in TN39, we can carry out window mastic at your property. We cover 289 towns and villages across East Sussex, from the larger towns to small villages. We also work in Brighton, around 26 miles away.
Postcode districts we cover here for window mastic: TN39 and TN40. Window mastic is available to properties on Mayo Lane, Bank Road and North Road. You will find Sidley on the A2691, which makes it straightforward to reach. If you are just outside Sidley, we cover Bexhill-on-Sea (1 mile south), Watermill (1 mile north), Lunsford's Cross (2 miles north-west), Russell's Green (3 miles north-west) and Hooe Common (3 miles west). Within a short drive, we also cover Eastbourne (9 miles south-west), Hastings (4 miles east), Hailsham (9 miles west), St Leonards (4 miles east), Polegate (10 miles west) and Hastings Old Town (5 miles east).
Around Sidley
We work in homes and buildings around The New Inn, Bexhill High Academy and Egerton Park and the streets around them. The closest station to Sidley is Bexhill station, roughly 1.4 miles south of the centre. Nearby you will also find Bexhill Hospital (0.7 miles south) and Bexhill Costume And Social History Museum (1.2 miles south). The countryside around Sidley includes Senlac Hill and Gillham Wood.
For landlords and businesses
For anyone letting property in or around Sidley, jobs at different addresses can go on one quote. Send us the addresses and the work at each.
Failed sealant is one of the commonest items on a check-out report, and it’s easy to sort out between tenants. We can quote for more than one property at once.
How the job changes by surface
uPVC windows
Fitters’ mastic on plastic frames is sometimes thin and rushed. It comes out, deep gaps get backing rod and the joint is resealed.
Aluminium frames
Metal frames expand in the sun and are often slim, with little room for error. A tidy bead in anthracite grey, black or a matching colour suits the frame.