West Sussex · England
Window Mastic in Stedham
Window mastic for Stedham, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Black, perished sealant on frames
- Water coming in at the bottom corners of a door
- White mastic on grey or black frames
DIY sealant or a professional job?
A DIY attempt doesn’t rule out a professional job. We cut it out and start again.
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed first.
About our window mastic in Stedham
Around Stedham we seal all kinds of frames: uPVC, aluminium, timber and composite, plus patio doors, French doors and sills. The sealant is chosen to suit the frame material and the wall. We work on composite doors, timber windows & doors and aluminium frames, and common reasons people get in touch are hard, cracked sealant around windows and white mastic on grey or black frames.
Outdoor sealant needs dry, clean surfaces, so work on frames around Stedham is planned for dry weather. Tell us about access to every side of the house, including upper-floor windows.
We stand behind the work with a one-year guarantee.
- Location
- Stedham (GU29)
- Wider area
- West Sussex
- Cover
- 12 months on all our work
- Quotes
- A clear price before we start
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
What happens on the day
We bring everything the job needs with us, so there’s nothing for you to buy. After a quick look at the joints together, we protect the area and start. Most jobs take a few hours for a handful of frames, longer for a whole house. Somewhere as small as Stedham, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We check how each frame can be reached safely.
- All the failed sealant is cut away.
- Frame and wall are cleaned and must be dry before sealing.
- Deep voids are backed, then the sealant is gunned in.
- The joint is shaped to shed water and the area tidied.
How to prepare
- On commercial sites, let us know about site rules
- Tell us about any water getting in
- Move anything stored near the joints
Get a quote
Every job is quoted individually, so the first step is telling us about yours. Simply ring 0345 464 0079 or send us an email and describe the job, and pictures are welcome.
Advice
Do you need window mastic in Stedham?
Some failures date back to when the windows were fitted. Mastic laid onto dusty, damp or crumbling surfaces never bonded as it should, so it comes away long before its time.
Any of these means the joints need attention:
- Gaps left after new windows were fitted
- Mastic that’s falling out in pieces
- Draughty joints inside around the window
- Gaps where the sill meets the wall
If you live in an older home near The Parish Church of St James, the joint between an old wall and a newer frame is usually the first place rain gets in.
Questions to ask before you book
- What happens if they find a problem under the old sealant
- Whether you can choose the colour
- When the joint can take water or movement
- How the surfaces are prepared before sealing
What sealant work can’t fix
Honest advice matters more to us than a booking, so here’s what new sealant won’t do:
- A sash or casement that won’t close properly
- A frame that has rotted at the joint
- Worn gaskets, brush seals or a door that has dropped
Not sure which it is? You can phone 0345 464 0079 or email us and we’ll tell you honestly before booking.
What we seal
- Aluminium frames
- uPVC windows
- Patio & French doors
- Timber windows & doors
- Composite doors
- Window sills
Stedham: your questions answered
Is window mastic in Stedham guaranteed?
Every job comes with our 12-month guarantee, wherever it is. We’re also fully insured and ARBOMaster approved.
Will you come out to Stedham?
Yes, we do. Our work covers London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Should I try DIY first?
It depends on the job. High-level, external movement and fire-rated joints are professional jobs, while a short indoor joint may be within reach.
Can you reach windows above the ground floor?
Yes, if safe access is possible. Higher or awkward frames may need extra access, and we’ll confirm what’s needed.
Can you seal over the old sealant?
No, it won’t last. It may look fine at first, but the new bead soon lifts. The old sealant has to come out completely.
Are you an approved applicator?
Yes. We’re approved under the ARBOMaster scheme, which is run for the Arbo sealant brand.
Do you seal inside as well as outside?
Yes. Indoors, we seal between the frame and the plaster or reveal.
Can new window sealant be painted?
It depends on the sealant. Some hybrid sealants can be painted; silicone cannot. Tell us if you are decorating and we will choose accordingly.
What affects the cost of window mastic
The price is agreed before any work begins. It’s based on:
- The number of rooms or windows
- Whether the work is at height
- The size of the job
- The old material and how stubborn it is
Instead of a standard rate, we price the job in front of us: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
What to tell us for a quote
Before you ask for a quote, have a think about:
- The type of property
- Access, such as stairs, a lift or height
- What’s wrong with the joints now
- Pictures of the joints, sent by email
For window mastic in Stedham, call 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and we’ll agree the price before any work begins.
Landlord and commercial work in Stedham
We work for letting agents and landlords as well as homeowners. Sealant work between tenants is a simple way to keep a property in good order.
Whether it’s one flat or a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a 12-month guarantee.
Places near Stedham
Other services in Stedham
What the job involves on each surface
uPVC windows
uPVC expands and contracts noticeably with temperature, so the joint needs a low-modulus sealant that stays flexible. White is the usual colour, with brown, anthracite grey and black for coloured frames.
Aluminium frames
Large aluminium doors have long joints down each side and across the head, and the bottom joint sees the most water. Each is cleaned, backed where deep and resealed.
What window mastic looks like in Stedham
With historic houses such as Cowdray House (about 1.8 miles east) nearby, there’s older building stock in the area around Stedham as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic. Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For site and facilities teams at buildings such as Stedham Primary School, the mastic around its windows and doors needs looking after like any other building’s.
Stedham is about 7 miles east of Petersfield, in West Sussex. We provide window mastic to homes and businesses in Stedham and the surrounding area, as part of our work across West Sussex. Stedham is one of 371 towns and villages in West Sussex we cover. Our Portsmouth page covers work nearby (19 miles or so).
Postcode districts we cover here for window mastic: GU29. Local streets include The Street, The Alley and Queens Street, all of which we cover. We also cover the places around Stedham: Iping (1 mile north-west), Woolbeding (1 mile east), Minsted (1 mile south-west), Bepton Common (1 mile south-east) and Midhurst (1 mile south-east). Further out, we also cover Bognor Regis (15 miles south), Chichester (11 miles south), Emsworth (12 miles south-west), Storrington (15 miles east), Billingshurst (14 miles east) and Portfield (11 miles south).
What’s near Stedham
In Stedham, that means homes and buildings near Midhurst Rother College and the streets around them. A little further out are Midhurst Museum (1.6 miles east) and Lodsworth Castle (4.5 miles east). Open spaces near Stedham include Iping and Stedham Commons and Wheeler's Down.