West Sussex · England
Window & door mastic in Warnham, West Sussex
Professional window mastic in and around Warnham, with every bit of old sealant taken out first and a 12-month guarantee.
- Rushed sealant from a window installation
- Black, perished sealant on frames
- Gaps where the sill meets the wall
When it is not the sealant
In fairness, some problems need a different trade:
- Faulty window hardware
- Condensation trapped between the panes
- Soft or decayed wood in the frame
Not sure which it is? You can call 0345 464 0079 or drop us an email and we’ll tell you honestly before you book.
Surfaces we seal
- Aluminium frames
- Window sills
- Composite doors
- uPVC windows
- Timber windows & doors
- Patio & French doors
About our window mastic in Warnham
Frames and walls do not move together. Heat and cold make frames grow and shrink against brick or render that hardly moves. So the sealant has to stretch and recover, which is why we use a low-modulus product. If you’re dealing with cold air getting in at the frame edge and sealant in the wrong colour for the frame, we can put it right, whatever the surface.
Mastic can only go onto a dry, clean joint, so window work in Warnham 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.
- Place
- Warnham (RH12)
- Wider area
- West Sussex
- Guarantee
- A year, on every job
- Price
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Looking after it afterwards
Once the sealant has cured, a few habits help it last:
- Use gentle cleaners on frames and sealant
- Keep jet washers away from the mastic
- Do not use solvent cleaners on the joint
- Keep paint off silicone joints
Check the drainage slots in the frames are not blocked, so water can run away instead of sitting against the joint.
A failed joint lets water into the wall a little at a time. Often the first sign is a damp patch inside or flaking paint on the reveal. Catching it early keeps the fix to a reseal.
DIY versus a professional finish
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.
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
For landlords and businesses
Landlords and agents in Warnham can book us as well as householders. Resealing between tenancies is a simple way to keep a property in good order before the next move-in.
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance that we can handle for you.
FAQs for Warnham
Is Warnham in your area for window mastic?
Yes, Warnham is within the area we cover. We work across London and the South East. Just ring 0345 464 0079 or send us an email with a few details of the job.
Can you help a landlord with a rental near Warnham station?
Yes, we work for landlords and letting agents. Just phone 0345 464 0079 or email us and tell us about the property, and we will send you a clear quote.
Do you have sealant for grey or black windows?
Yes. Anthracite grey, black, brown and white cover most frames, with clear as an option.
Do the sealants smell?
It depends on the product. Some products have a noticeable smell, others very little, and any smell fades as they cure.
Do you seal inside as well as outside?
Yes. Plenty of draughts come through the inside joint as well as the outside, so sealing both is often worthwhile.
When is the sealant fully cured?
Cure times vary by product. We tell you how long to leave it before we go.
Where is Mr Mastic based?
We work from Crawley. Our applicators cover Warnham.
Will new mastic stop draughts?
Often, yes. The gap between frame and wall is a common source of draughts, and sealing the inside and outside joints closes that path.
The process
Most of a good job is in the preparation, so that’s where we spend the time. Every joint is cleaned and dried before new material goes in. All told, the work takes a few hours for a few frames, or a day or more for a whole house. In a small place like Warnham, access is generally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We start by checking each window and door with you.
- The old mastic is cut out and the surfaces cleaned back.
- Deep gaps are filled with backing rod to set the depth.
- New exterior sealant goes on in a matching colour and is tooled smooth.
- Finally we tidy up and check each joint.
How to prepare
- Where the joints are inside, avoid wetting them before we arrive
- Plan for the work area to be out of bounds to pets and children
- Mention if the joints have been sealed before
Getting a quote
It all starts with a short chat. Describe the problem, the location and the size of the job, and we will talk you through what we’d do. When it suits you, ring 0345 464 0079 or send us an email.
Related advice
Nearby places to Warnham
More services for Warnham
Frames and glazing around Warnham
Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
For site and facilities teams at buildings such as Warnham CofE Primary School, its window and door frames need their mastic kept sound, just like a home’s. In the older streets around The Parish Church of St Margaret, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Warnham is about 2 miles north-west of Horsham, in West Sussex. Warnham gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Across West Sussex, we cover 371 places, Warnham among them. Crawley is on our list too, around 7 miles away.
Work in RH12 works the same way as everywhere else we cover. Local streets include Hollands Way, Stanford Orchard and Gardeners Close, and we cover them all. Other places close to Warnham include Broadbridge Heath (2 miles south), Holbrook (2 miles east), Horsham (2 miles south-east), Rowhook (2 miles west) and Tower Hill (2 miles south). Larger places within reach include Crawley (7 miles east), Haywards Heath (13 miles south-east), Burgess Hill (13 miles south-east), East Grinstead (15 miles east), Broadfield (6 miles east) and Storrington (12 miles south).
Near you in Warnham
Typical jobs here are in homes near Warnham Park, The Greets Inn and Greenway Academy. The closest station to Warnham is Warnham station, about 1 mile east of the centre. Nearby you’ll also find Horsham Hospital (1.8 miles south-east) and Christs Hospital School Museum (3.2 miles south). The countryside around Warnham includes Warnham LNR and Vann Lake.
What the job involves on each surface
uPVC windows
We clean the frame edge carefully so the plastic isn’t marked, then the sealant goes in between frame and wall and tooled smooth.
Window sills
The end joints of a sill tend to fail before the rest. We reseal them so rain can’t run into the wall.
Common problems we fix in Warnham
Plenty of failed mastic was poorly applied in the first place. Mastic laid onto dusty, damp or crumbling surfaces never bonded as it should, so it comes away long before its time.
Look out for any of the following:
- Cracked sealant at the sill ends
- Cracked or shrunken mastic around the frame
- Water coming in at the bottom corners of a door
- Gaps between the frame and the inside reveal
Rented homes near Warnham station change hands often, and renewing tired window mastic between tenants heads off draught and damp complaints.
Questions to ask before booking
- Which sealant they’ll use, and why
- What the quote includes, VAT included or not
- How long the guarantee is
- Who turns up on the day