West Sussex · England
Window Mastic in South Mundham
Mastic around window and door frames, sills and patio doors for homes and businesses in South Mundham and across West Sussex. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Hard, cracked sealant around windows
- Cracked internal joints between frame and plaster
- Mastic that is falling out in pieces
Window mastic for homes and businesses in South Mundham
A cold draught around a closed window often comes from the frame edge. A new joint stops the air getting through and quietens the whistle on windy days. If the draught is through the window seals instead, we’ll tell you. Common call-outs are for mastic that has split away from the wall and damp patches on the reveal after heavy rain, across patio & French doors, composite doors and aluminium frames.
Mastic can only go onto a dry, clean joint, so window work in South Mundham is booked around the forecast. Let us know about access to all the frames, upstairs ones included.
Each job carries a 12-month guarantee, whatever its size.
- Where
- South Mundham (PO20)
- Wider area
- West Sussex
- Guarantee
- A year, on every job
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Should I try it myself first?
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.
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
Nearby places to South Mundham
Other services in South Mundham
Common questions in South Mundham
Do you work for landlords with property near Chichester station?
Yes. We work for landlords and agents as well as homeowners, and several properties can go on one quote. Just call 0345 464 0079 or send us an email with the address and what needs doing, and we’ll give you a clear quote.
Is South Mundham within the area you cover?
Yes, smaller places are covered as well as towns. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Do I have to be there?
We need access to the joints, so we’ll agree that with you when we book. For inside work, that normally means someone being in.
Can new window sealant be painted?
Not usually, if it’s silicone. We choose the product with your decorating in mind, so mention it when you book.
Will there be a smell?
Sometimes, a little. It fades as the sealant cures, and ventilation helps.
How long does it take to reseal the windows on a house?
The work takes a few hours for a handful of frames, longer for a whole house. Access and the amount of old mastic make the biggest difference.
Will you leave a mess?
Very little: the area around the joints is protected first, and we clear up the old sealant and our materials before we leave.
How long before the joint can be used?
That depends on the sealant used, so follow the cure time we give you.
What sealant work can’t fix
To be straight with you, some problems need a different trade:
- Rotten timber, which needs a joiner first
- A sash or casement that will not close properly
- A door that needs adjusting, rehanging or new seals
If in doubt, ring 0345 464 0079 or send us an email and we will say what we think before you book.
Joints and surfaces we work on
- Patio & French doors
- uPVC windows
- Aluminium frames
- Window sills
- Timber windows & doors
- Composite doors
How the visit works
Our applicators work methodically: protection first, then preparation, sealing and a tidy-up. For most jobs that takes anything from an hour or two to a full day, depending on how many frames there are. For a village or hamlet like South Mundham, the journey is planned in advance: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- 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.
- 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
- On commercial sites, let us know about site rules
- Where the joints are inside, avoid wetting them before we arrive
- Keep pets and children clear of the area while we work
Ask for a quote
To get a quote, call 0345 464 0079 or email us with the location and a short description of the problem. You will have a clear quote before any work starts.
Related advice
What window mastic looks like in South Mundham
South Mundham 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. 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.
For an older house near a landmark such as The Parish Church of St Stephen, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. Schools such as North Mundham Primary School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s.
South Mundham is about 3 miles south of Chichester, in West Sussex. From the centre of South Mundham to the outskirts, window mastic is available for homes and businesses alike, from flats and houses to offices and hotels. 371 places in West Sussex are on our list, large and small. Our Portsmouth page covers work nearby (14 miles or so).
Here we cover the PO20 postcode area for window mastic. You’ll find streets such as Manor Lane and Honer Lane, all of which we cover. We also cover the places around South Mundham: Fisher (1 mile west), Street End (2 miles south-west), Sidlesham Common (2 miles west), Nyetimber (2 miles south-east) and Sidlesham (2 miles south-west). Within a short drive, we also cover Bognor Regis (3 miles east), Chichester (3 miles north), Selsey (5 miles south), Littlehampton (10 miles east), Emsworth (9 miles north-west) and Rustington (11 miles east).
Around South Mundham
Typical jobs here are in homes near Chichester High School For Girls and Avisford. The closest station to South Mundham is Chichester station, roughly 2.5 miles north-west. Nearby you will also find Chichester Castle (3 miles north) and Chichester Cathedral Treasury (2.7 miles north-west).
Why it’s worth doing now in South Mundham
If you are painting or rendering, reseal at the same time. A clean new bead makes new paint or render look finished, and it’s easier while the walls are being worked on anyway. Older cottages and farmhouses around South Mundham can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
No two jobs are quite the same, so we quote each one individually. Size, access and the product the joint needs all make a difference.
Why choose Mr Mastic in South Mundham
- We agree the colour with you first
- Every job guaranteed for a year
- Quality sealants from Arbo and Everbuild
- Colour picked to suit the job
Signs you need window mastic in South Mundham
Sills take more water than any other part of a window, so the sill ends and the joint below the frame are common leak points. Failed sealant there lets rain into the wall or behind the frame.
These are the problems we are asked about most:
- Draughty joints inside around the window
- Cracked sealant at the sill ends
- Mastic that’s falling out in pieces
- White mastic on grey or black frames
Rented homes near Chichester station change hands often, and renewing tired window mastic between tenants heads off draught and damp complaints.
What your quote should include
- How the joint is cleaned and prepared
- What product goes in the joint
- How much experience the applicator has
- Is the old sealant removed completely?
Quotes for window mastic in South Mundham
For a quick quote, just ask. The main things that affect it are:
- Working hours on commercial sites
- The product the joint needs
- The number and length of the joints
- How easy the joints are to reach
The cost reflects the work involved, not guesswork. That is why we ask about the job first.
What we need to know
Photos by email are helpful but not essential. Please mention:
- The rough size of the job
- If it’s domestic, commercial or a hotel
- Whether it has been sealed before
- Where the job is, and your postcode
For window mastic in South Mundham, call 0345 464 0079 or email us. Tell us what the problem is and where, and we will agree the price before any work begins.
Landlord and commercial work in South Mundham
We also work for businesses, from offices to washrooms and kitchens. For commercial premises, we can talk through working times when we quote.
For anyone letting property in or around South Mundham, jobs at different addresses can be quoted together. Send us the addresses and the work at each, and pictures by email help.