West Sussex · England
Window Mastic in Lumley
Mastic around window and door frames, sills and patio doors in Lumley, with a one-year guarantee on every job. Ask us for a quote.
- Water coming in at the bottom corners of a door
- Mastic that has split away from the wall
- Sealant in the wrong colour for the frame
How we handle window mastic in Lumley
A window frame and the wall around it expand and shrink at different rates. Plastic and aluminium frames move with the temperature, while masonry stays fairly still. That is why the joint needs a flexible, low-modulus sealant rather than something rigid. We’re often asked to deal with cracked or shrunken mastic around the frame and rushed sealant from a window installation, across composite doors, timber windows & doors and aluminium frames.
Around Lumley, many homes face open ground, so their windows and doors take the full weather. Exposed frames and sills lose their mastic sooner than sheltered ones.
Our work is backed for twelve months.
- Place
- Lumley (PO10)
- Wider area
- West Sussex
- Guarantee
- 12 months on all our work
- Quote
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Landlords, agents and businesses in Lumley
For anyone letting property in or around Lumley, several properties can go on one quote. Send us the addresses and the work at each, and photos by email help.
We regularly work with letting and managing agents. Tell us the address, the job and how access works.
Lumley: your questions answered
Do you work for landlords with property near Emsworth station?
Yes. We work for landlords and letting agents as well as householders, and several properties can go on one quote. Just phone 0345 464 0079 or drop us an email with the address and what needs doing, and we will give you a clear quote.
Does living near the coast affect window mastic in Lumley?
Coastal homes put outside sealant through more weather than inland ones, so the choice of sealant and the preparation matter even more. It’s worth checking the walls that face the sea first.
Can you work on commercial sites?
Yes, regularly. Larger jobs can be planned room by room or area by area to suit the site.
Are you fully insured?
Yes. We are fully insured.
Do you come to Lumley?
Yes. From our base in Crawley, we cover South East England, London and all of Scotland, and that includes Lumley.
Is there any odour?
Some sealants have a smell while they cure, which fades as it sets. Ventilation helps.
Do I need to be at home?
If the work is inside, we need someone to let us in. After that, you can carry on with your day.
Do you have sealant for grey or black windows?
Yes. We can use white, brown, anthracite grey, black or clear, so the joint suits the frame.
What affects the cost of window mastic
For a quick quote, just ask. The main things that affect it are:
- The size of the job
- How many rooms, windows or areas are involved
- Access and height
- The type of sealant required
A failed joint rarely gets cheaper to fix by waiting, as water and mould keep getting in. If you are not sure whether it needs doing, phone 0345 464 0079 or send us an email and we will give you an honest view and a quote.
What to tell us for a quote
You do not need to know the technical terms. Just tell us:
- Roughly how big the job is
- Access, such as stairs, a lift or height
- The problem you’ve noticed
- Whether it’s a home or a business
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints.
Places near Lumley
More services for Lumley
Frames and glazing around Lumley
Lumley is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. Both are hard on the mastic around window and door frames, which can dry out and crack sooner where a building faces the weather. Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Letting a property close to Emsworth station? Then sound mastic around windows and doors keeps out the draughts and damp that tenants notice first. For site and facilities teams at buildings such as St James Church of England Controlled Primary School, the mastic around its windows and doors needs looking after like any other building’s. 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.
Lumley is about 1 mile east of Emsworth, in West Sussex. Across the PO10 area, our applicators can take on window mastic. Across West Sussex, we cover 371 places, and Lumley is one of them. We also work in Portsmouth, around 7 miles away.
Postcode districts we cover here for window mastic: PO10. You will find streets such as Lumley Road and Northlands Park, all of which we cover. We also cover the places around Lumley: Emsworth (1 mile west), Westbourne (1 mile north), Southbourne (1 mile east), Woodmancote (1 mile north-east) and Denvilles (1 mile west). Further out, we also cover Bognor Regis (12 miles east), Chichester (7 miles east), Selsey (10 miles south-east), Portfield (7 miles east), Yapton (14 miles east) and East Wittering (7 miles south-east).
Near you in Lumley
Typical jobs here are in homes near Eames Farm, Bourne Community College and Lord Raglan P.H. Pub, among other places. Lumley has its own railway station: Emsworth station. Other landmarks nearby include Warblington Castle (1.6 miles west) and Emsworth Museum (less than half a mile south-west). Open spaces near Lumley include Stoke Down and Brook Meadow (Emsworth).
Why it’s worth doing now in Lumley
Not every sealant suits a window. Decorators’ caulk and bathroom silicone aren’t designed for outside joints that move. A low-modulus exterior sealant keeps its stretch through hot and cold weather. In a small place like Lumley, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
A few things move the cost up or down: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether we need extra access for height. Your quote takes all of that into account.
Why choose Mr Mastic in Lumley
- We never seal over old sealant
- 180+ five-star Google reviews
- You choose the colour before work begins
- Anti-fungal sanitary silicone in wet areas
Take a look at what affects the cost or customer reviews.
What we can’t put right
In fairness, there are a few things sealant will not fix:
- Broken hinges, locks or handles
- Draughts through the window seals rather than the frame
- Penetrating damp from a failed cavity tray or render
Not sure which it is? You can ring 0345 464 0079 or drop us an email and we will tell you honestly before booking.
Surfaces we seal
- Patio & French doors
- Timber windows & doors
- Composite doors
- Window sills
- uPVC windows
- Aluminium frames
How the job changes by surface
uPVC windows
We clean the frame edge carefully so the plastic is not marked, then the sealant goes in between frame and wall.
Aluminium frames
Coated aluminium needs a compatible sealant, and acetoxy silicones aren’t used, as they can attack some metals. We use a neutral-cure product.
Can I do it myself?
If you are set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
How it works
You don’t need to clear the whole room or building, just the space around the work. We protect the rest, and the work takes a morning for a couple of windows and a door for a typical job. Somewhere as small as Lumley, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- First, we confirm safe access to each frame.
- Old, cracked mastic is removed completely, along with any loose debris.
- The surfaces are cleaned and left dry, and primed where the sealant calls for it.
- Deep voids are backed, then the sealant is gunned in.
- We tool the joint so water runs off, then clear up.
How to prepare
- Try not to wet indoor joints just before the visit
- Move anything stored near the joints
- Keep pets and children clear of the area while we work
Getting a quote
Need a quote? Please call 0345 464 0079 or drop us an email with a few details. You’ll know what we plan to do, and what it will cost, before any work begins.