West Sussex · England
Sidlesham Window Mastic
Our applicators work in Sidlesham on mastic around window and door frames, sills and patio doors. Old material cut out, joints cleaned and sealed neatly and a one-year guarantee.
- A bead that doesn’t match the frame
- Mastic that’s falling out in pieces
- Mastic that has split away from the wall
Window mastic in Sidlesham, done properly
The mastic around a window or door seals the gap between the frame and the wall. When it cracks, hardens or pulls away, draughts and rain get in. The old mastic is removed and the joint resealed with a flexible exterior sealant. If you’re dealing with gaps between the frame and the inside reveal and water coming in at the bottom corners of a door, we can put it right.
Around Sidlesham, many homes face open ground, so their windows and doors take the full weather. That exposure dries out and cracks the mastic around frames and sills faster.
You’re covered for a year from the day we finish. If anything is not right with it, phone 0345 464 0079 or drop us an email.
- Location
- Sidlesham (PO20)
- Wider area
- West Sussex
- Cover
- A year, on every job
- Quotes
- A clear price before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Looking after it afterwards
Simple care keeps the joints in good condition. We recommend:
- Paint up to the joint, not over it
- Wipe condensation off the frames
- Keep jet washers away from the mastic
- Keep paint and stain on wooden frames in good order
Silicone can’t normally be painted, so if you’re planning to paint the frames or walls, tell us beforehand. We can use a paintable sealant where that matters.
Signs to watch for: split or missing mastic, gaps, damp patches inside or black mould on the reveal. If you notice one, it’s time to get the joint looked at.
What sealant work can’t fix
We will always be straight with you, so here’s what sealant cannot fix:
- Faulty window hardware
- Misting between the panes of a double-glazed unit (that needs a new unit)
- A frame that has rotted at the joint
If you are not sure, just call 0345 464 0079 or drop us an email and we will give you a straight answer.
Where we work in Sidlesham
- Composite doors
- uPVC windows
- Timber windows & doors
- Aluminium frames
- Window sills
- Patio & French doors
Sidlesham: your questions answered
Is Sidlesham within the area you cover?
Yes, we do. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Does living near the coast affect window mastic in Sidlesham?
Coastal weather is harder on outside sealant: there’s more wind-driven rain and, closer to the shore, salt in the air. Choosing the right sealant for the frame and wall, laid at the right depth, helps it last.
Do I need to be at home?
Access is agreed with you when the job is booked. Indoors, that usually means someone at home.
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.
I rent my home. Can I book you?
We are happy to deal with the tenant, landlord or agent. Get your landlord’s agreement first.
How long should I leave it?
That depends on the sealant used, so follow the cure time we give you.
Will new mastic stop draughts?
In many cases. The gap between frame and wall is a common source of draughts, and resealing inside and out closes it.
Can you seal over the old sealant?
No, because it fails. The old sealant always comes out first.
Signs you need window mastic in Sidlesham
Plenty of failed mastic was poorly applied in the first place. Sealant run over dust, wet brick or loose mortar didn’t grip properly, so it comes away long before its time.
These are the problems we are asked about most:
- Draughts coming in around windows and doors
- Mastic that has split away from the wall
- Leaking joints at the ends of sills
- Gaps left after new windows were fitted
For landlords with property near Chichester station, sound mastic around windows and doors keeps out the draughts and damp that tenants notice first.
What your quote should include
- What the cure time is
- What preparation is included
- Is VAT in the price?
- How hidden problems are handled
Landlords, agents and businesses in Sidlesham
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance.
From a single let to a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a one-year guarantee.
Quotes for window mastic in Sidlesham
We quote each job individually. These are the things that affect it:
- The amount of work
- The number of rooms or windows
- Mould in or behind the old joints
- Any working-time requirements on site
Every job is a little different, 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.
Asking for a quote
Before you ask for a quote, have a think about:
- Any previous sealing or DIY work
- Photos by email, if that’s easy
- Where the property is
- Access, such as stairs, a lift or height
Need a quote? Please ring 0345 464 0079 or send us an email and tell us about the job. You will know what we plan to do, and what it will cost, before any work begins.
Nearby places to Sidlesham
Other services in Sidlesham
Why act early in Sidlesham
Once mastic fails, rain can get between the frame and the wall. Over time that can mean damp patches, damaged plaster and rotting timber. Resealing now is a small job by comparison. Older cottages and farmhouses around Sidlesham can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
What it costs depends on the size of the job, how much old material has to come out and how easy the joints are to reach. You will have a clear quote before any work starts.
Why choose Mr Mastic in Sidlesham
- White, clear, grey or coloured to suit, where the product allows
- 20+ years of sealant experience
- Colour agreed with you before any work starts
- Quality sealants from Arbo and Everbuild
Sidlesham homes and the weather
Sidlesham is within about 1 mile of the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. That is hard on the mastic around window and door frames, especially on the side facing the sea. London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
If you live in an older home near St Mary Our Lady Sidlesham, the joint between an old wall and a newer frame is usually the first place rain gets in. If you look after a building such as Sidlesham Primary School, larger buildings have plenty of frames, and the mastic around each one ages.
Sidlesham is about 3 miles north of Selsey, in West Sussex. Anywhere in PO20, we cover window mastic for homes and businesses. Across West Sussex, we cover 371 places, and Sidlesham is one of them. For nearby work, see our Portsmouth page, about 13 miles away.
Every address in PO20 is within our area for window mastic, from the main roads to the quietest streets. You’ll find streets such as Rookery Lane, Selsey Road and Manhood Lane. Sidlesham sits on or near the B2145. We also cover Keynor Estate (1 mile south-west), Street End (1 mile north), Sidlesham Common (1 mile north), Fisher (2 miles north-east) and Church Norton (2 miles south). Within a short drive, we also cover Bognor Regis (4 miles east), Chichester (4 miles north), Selsey (3 miles south), Littlehampton (11 miles east), Emsworth (8 miles north-west) and Rustington (12 miles east).
Local landmarks in Sidlesham
Sidlesham’s nearest station is Chichester station, roughly 3.9 miles north. Other landmarks nearby include St Richard's Hospital (4.7 miles north) and Chichester Castle (4.4 miles north).
How it works
At the end, we look at the finished work together and explain the cure time. The work normally takes anything from an hour or two to a full day, depending on how many frames there are, depending on the size of the job. For a village or hamlet like Sidlesham, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- We check each frame and agree which ones need doing.
- Next the failed sealant is cut away and the joint cleaned.
- 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.
- Finally we tidy up and check each joint.
Before we arrive
- Move anything stored near the joints
- For business premises, tell us about site rules or sign-in
- Tell us about any water getting in
Get a quote
Every job is quoted individually, so the first step is telling us about yours. Just ring 0345 464 0079 or email us with the details.