West Sussex · England
Selham Window Mastic
Specialist window mastic for Selham: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Cracked internal joints between frame and plaster
- Mastic that has split away from the wall
- Cold air getting in at the frame edge
How we handle window mastic in Selham
Over two decades of sealing frames has taught us which products suit which walls. We’re fully insured ARBOMaster approved applicators, and every job is covered by a 12-month guarantee. We work on aluminium frames, uPVC windows and window sills, and the jobs we see most are cracked internal joints between frame and plaster and a bead that doesn’t match the frame.
Outdoor sealant needs dry, clean surfaces, so work on frames around Selham is planned for dry weather. Let us know about access to all the frames, upstairs ones included.
Each job carries a 12-month guarantee.
- Place
- Selham (GU28)
- Region
- West Sussex
- Guarantee
- A year, on every job
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
How we quote for window mastic
Every job gets its own quote. This is what makes a difference:
- The number and length of the joints
- Whether old sealant or filler has to be cut out
- Whether the work is at height
- Any mould that needs treating
We do not show prices on the website, because the cost depends so much on the job itself. Call for a quick quote and we’ll talk you through it.
Asking for a quote
Photos help, but a description is a good start. Please mention:
- What the problem is, such as mould, gaps, leaks or cracking
- Access, such as stairs, a lift or height
- Where the job is, and your postcode
- The type of property
For a quick quote, get us on the phone, or send an email if you’d rather. Describe what needs sealing and we’ll explain what’s involved and give you a clear price.
Signs you need window mastic in Selham
Every frame moves through the day. Sun on a frame makes it expand, and it contracts again overnight, while the brick or render around it hardly moves. If the sealant can’t stretch, it splits.
Common reasons people contact us include:
- Mastic that has split away from the wall
- Black, perished sealant on frames
- Gaps left after new windows were fitted
- Draughts coming in around windows and doors
Around Selham, as everywhere, window mastic is only as good as the preparation behind it.
What to look for in a quote
- Is VAT in the price?
- What preparation is included
- Who does the work, and how experienced they are
- Are they insured?
DIY sealant or a professional job?
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.
If you do try it yourself, take your time over the preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it does not work out, we can still put it right.
Selham: your questions answered
What guarantee comes with window mastic in Selham?
Every job comes with our one-year guarantee, wherever it is. We’re also fully insured and ARBOMaster approved.
Do you cover smaller places like Selham?
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.
How much does window mastic cost in Selham?
Every job is different, so each one gets its own quote. For a quick quote, call 0345 464 0079 or send us an email with a short description of the job.
Is the new sealant paintable?
It depends on the sealant. Silicone is not paintable, but some hybrid sealants are. Tell us if you are decorating and we’ll choose accordingly.
Can you do several jobs on one visit?
Yes, we can. Several rooms, windows or areas can go on one quote.
I rent my home. Can I book you?
Yes. Ask your landlord first, and we can send them the quote if that helps.
Is there any odour?
Some sealants have a smell while they cure, but it fades. Opening a window helps.
How long will my window job take?
A handful of frames is a short visit. You will get a timescale with the quote.
Looking after it afterwards
To keep the joints looking good and working properly:
- Don’t use solvent cleaners on the joint
- Wipe condensation off the frames
- Check the mastic once a year
- Keep jet washers away from the mastic
A yearly look round the frames is enough. Small splits are simple to catch before they leak, and if anything looks wrong, just phone 0345 464 0079 or drop us an email.
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.
What window mastic looks like in Selham
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. Historic houses like Cowdray House (about 2.7 miles west) are a reminder that the area around Selham has older buildings as well as new. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic.
In the older streets around Church of St James, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Selham is about 8 miles south of Haslemere, in West Sussex. Anywhere in GU28, our applicators can take on window mastic. We cover 371 towns and villages across West Sussex. Our Portsmouth page covers work nearby, about 21 miles away.
Postcode districts we cover here for window mastic: GU28. Neighbouring places we cover for window mastic include South Ambersham (1 mile west), River (2 miles north), Tillington (2 miles north-east), Upperton (2 miles north-east) and Rotherbridge (2 miles east). We also work in nearby towns such as Bognor Regis (13 miles south), Chichester (11 miles south-west), Littlehampton (13 miles south-east), Emsworth (14 miles south-west), Rustington (14 miles south-east) and Storrington (11 miles east).
Local landmarks in Selham
A little further out are Midhurst Community Hospital (2.9 miles west) and Coultershaw Heritage Site (2.5 miles east). Open spaces near Selham include Graffham Common.
Other services in Selham
When it is not the sealant
We won’t take on work that won’t last, so these are the limits:
- A sash or casement that will not close properly
- Damp problems in the wall away from the window
- A failed sealed unit that has misted up
Not sure which it is? You can phone 0345 464 0079 or email us and we will tell you honestly.
Surfaces we seal
- Aluminium frames
- Composite doors
- Window sills
- uPVC windows
- Timber windows & doors
- Patio & French doors
Landlords, agents and businesses in Selham
From a single let to a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a 12-month guarantee.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. Several properties can be quoted together.
How it works
Before we leave, we go over the finished joints with you and explain the cure time. The visit itself usually takes a few hours for a few frames, or a day or more for a whole house, depending on the size of the job. Somewhere as small as Selham, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- First, we go round the frames with you and agree the list.
- The old mastic is cut out and scraped back to clean surfaces.
- Where the gap is deep, backing rod goes in first.
- A flexible exterior sealant is applied in a colour to suit the frame.
- We tool each bead neatly and check every joint is closed.
How to prepare
- Mention if the joints have been sealed before
- Move anything stored near the joints
- Keep pets and children clear of the area while we work
Getting a quote
Every job is quoted individually, so start by telling us what you need. Just phone 0345 464 0079 or drop us an email with the details.