West Sussex · England
Barnham Window Mastic
Window mastic for Barnham, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Black, perished sealant on frames
- Draughts coming in around windows and doors
- Rushed sealant from a window installation
Honest limits
We’d rather tell you now than do work that won’t last, so here’s what sealant can’t put right:
- Misting between the panes of a double-glazed unit (that needs a new unit)
- Soft or decayed wood in the frame
- Draughts through the window seals rather than the frame
If in doubt, phone 0345 464 0079 or email us and we will say what we think.
What we seal
- Window sills
- Patio & French doors
- uPVC windows
- Timber windows & doors
- Composite doors
- Aluminium frames
Window mastic in Barnham
Homes in Barnham have every kind of window: uPVC, aluminium, timber and composite, along with patio doors, French doors and sills. Each gets a sealant chosen for the frame and the wall it meets. We work on patio & French doors, aluminium frames and uPVC windows, and common reasons people get in touch are draughty joints inside around the window and mastic that has split away from the wall.
Outdoor sealant needs dry, clean surfaces, so work on frames around Barnham is planned for dry weather. Let us know about access to all the frames, upstairs ones included.
All our work comes with our one-year guarantee.
- Place
- Barnham (PO22)
- Region
- West Sussex
- Guarantee
- One year on every job
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Nearby places to Barnham
Other services in Barnham
What affects the cost of window mastic
There’s no set price list. The quote depends on:
- The type of sealant required
- Access and height
- The number of rooms or windows
- Any working-time requirements on site
Every job is a little different, so each one gets its own quote. The number of joints, how easy they are to reach and the sealant needed all play a part, and we will explain the quote if you ask.
What to tell us for a quote
Photos help, but a description is a good start. Try to tell us:
- Roughly how big the job is
- What’s wrong with the joints now
- Whether it has been sealed before
- The address or postcode of the job
Need a quote? Please ring 0345 464 0079 or email us with a few details. We will explain what we’d do and send you a clear quote before we start.
Aftercare tips
A little care helps the new joints last. We recommend:
- Keep solvents and bleach off the sealant
- Check the mastic once a year
- Keep paint off silicone joints
- Keep paint and stain on wooden frames in good order
Try not to touch the new joint while it cures, for as long as we advise. Keep jet washers away from the frames.
Leaks generally show up in wet, windy weather, but sealant goes on best when frames and walls are dry. Sorting cracked mastic early means the joint is sound before the bad weather.
Different surfaces, different methods
Composite doors
Front doors take the weather head on, and the top and bottom corners tend to fail first. Those corners get the most care.
Timber windows & doors
Timber moves with moisture as well as heat, so a flexible sealant is essential. The paint or stain needs to be sound where the sealant meets it.
Why deal with it now?
Failed mastic is not a reason to replace sound windows. Where the frames are sound, new mastic usually deals with draughts and leaks at the edges. Problems with the glass or gaskets are for a window company, and we will say so. Around Barnham, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
The cost reflects the work involved, not a rough estimate. That’s why we ask a few questions first and send you a clear quote before work begins.
Why choose Mr Mastic in Barnham
- Anti-fungal silicone where joints get wet
- Domestic, commercial and hotel work
- A sealant colour to suit the surroundings
- Fully insured
Barnham questions
Do you work for landlords with property near Barnham station?
Yes, rental work is part of what we do. You can ring 0345 464 0079 or send us an email with the address and a few details, and we will give you a fixed price before any work starts.
Do you cover smaller places like Barnham?
Yes. Barnham is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
Do you remove the old sealant?
Yes. All of the old material is cut out and the joint cleaned before resealing.
Do you guarantee window mastic?
Yes. Our 12-month guarantee covers every job.
Does someone need to be in?
It depends on the job. Inside work needs someone to give us access, while outside work can sometimes be arranged differently.
Do the sealants smell?
It depends on the product. Some smell for a while, some hardly at all, and any smell fades as they cure.
Can you seal the gap between the frame and the plaster indoors?
Yes. The outside joint keeps the weather out, and the inside joint stops draughts and finishes the reveal. We do one or both.
What should I tell you?
Where the job is, what the problem is and roughly how big it is. If you can, email a few photos.
DIY sealant or a professional job?
A DIY attempt does not rule out a professional job. We remove it and do the joint properly.
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
Window mastic in Barnham: local notes
Barnham is close to the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. Both are hard on the mastic around window and door frames, which can dry out and crack sooner where a building faces the weather. The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Letting a property close to Barnham station? Then cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets. If you look after a building such as Barnham Primary School, larger buildings have plenty of frames, and the mastic around each one ages. If you live in an older home near The Parish Church of St Mary, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Barnham is about 4 miles north-east of Bognor Regis, in West Sussex. Barnham gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Our area takes in 371 places across West Sussex. For nearby work, see our Portsmouth page.
Work in PO22 is quoted and booked the same way as anywhere else. Whether your property is on Garden Crescent, Dollery Road and Goodacres or anywhere close by, we can help. We also cover West Barnham (1 mile north-west), Walberton (1 mile north-east), Yapton (1 mile south-east), Eastergate (1 mile north-west) and Lidsey (1 mile south-west). Within a short drive, we also cover Worthing (10 miles east), Bognor Regis (4 miles south-west), Chichester (6 miles west), Selsey (9 miles south-west), Littlehampton (5 miles east) and Lancing (14 miles east).
Local landmarks in Barnham
Typical jobs here are in homes near The Murrell Arms and St Philip Howard Catholic High School. There’s a railway station in Barnham itself: Barnham station. Nearby you will also find Bognor Regis War Memorial Hospital (3.2 miles south-west) and Tote Copse Castle (2.5 miles west). For a walk, there’s WWT Arundel.
What happens on the day
There’s no need to move everything out, just the space around the work. We protect the rest, and the work takes a few hours for a handful of frames, longer for a whole house in most cases. In a small place like Barnham, access is usually the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- First, we confirm safe access to each frame.
- Old, cracked mastic is removed completely, along with any loose debris.
- Frame and wall are cleaned and must be dry before sealing, and primed where the sealant calls for it.
- Backing rod fills deep voids and the sealant goes in on top.
- The joint is shaped to shed water and the area tidied.
Preparing for the visit
- Mention any parking rules near the property
- Tell us about any water getting in
- Tell us about any previous sealing or DIY attempts
Get a quote
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and email photos if that is easy.