West Sussex · England
Window & door mastic in Three Bridges, West Sussex
Window mastic in Three Bridges from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Old mastic that has gone black or come away
- Mastic that has split away from the wall
- Sealant in the wrong colour for the frame
Window mastic for homes and businesses in Three Bridges
Over two decades of sealing frames has taught us which products suit which walls. We’re fully insured ARBOMaster approved applicators, and we give a 12-month guarantee on the work. Typical jobs include rain getting in at the frame or under the sill and draughty joints inside around the window, on uPVC windows, patio & French doors and composite doors.
Around Three Bridges, conservatories, garden rooms and patio doors are often part of the house. Those joints need the same attention as the main windows.
Our work is backed for twelve months, in Three Bridges and everywhere else we cover.
- Place
- Three Bridges (RH10)
- Region
- West Sussex
- Cover
- One year on every job
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
How we quote for window mastic
There’s no set price list, because no two jobs are the same. The quote depends on:
- The type of sealant required
- Whether the work is at height
- How many areas need sealing
- Whether there’s mould to deal with
The cost depends on the amount of work, how much old material has to come out and how easy the joints are to reach. We give a clear quote before work begins, so you know where you stand.
Asking for a quote
Photos help, but a description is a good start. Please mention:
- Where the job is, and your postcode
- If someone has resealed it before
- Whether it’s a home or a business
- How many joints, rooms or windows are involved
For a quote, ring 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. We’ll give you a clear quote before any work starts.
Nearby places to Three Bridges
Also in Three Bridges
FAQs for Three Bridges
Should the sealant in an older Three Bridges home be renewed?
In most cases, yes, if it hasn’t been done for a while. Sealant is a maintenance item: how long it lasts depends on use, cleaning and exposure, and many homes in Three Bridges may already be on their second or third set.
Is Three Bridges within the area you cover?
Yes. Three Bridges is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Do I have to be there?
If the work is inside, we need someone to let us in. After that, you can carry on with your day.
Can new sealant go over the old?
No. New silicone won’t bond to old silicone, and it traps any mould or water underneath. It all has to come out first.
I rent my home. Can I book you?
Yes. Ask your landlord first, and we can send them the quote if that helps.
Can I paint over the new sealant?
That depends on the product. Silicone is not paintable, but some hybrid sealants are. Mention any painting plans before we start.
Do you work for hotels and businesses?
Yes. We have worked for hotels, offices and other businesses, and we are fully insured.
Do you work for landlords and businesses?
Yes, regularly. Several properties can go on one quote.
What happens if it’s left?
Running fresh sealant over the old joint is tempting, but new sealant can’t bond to old, crumbling mastic. It peels before long, and water still gets in behind. The old mastic has to come out. In a smaller place like Three Bridges, wherever a wall is exposed, a failed outside joint is a real source of damp. Inside, a split seal lets water into floors and panels just as it would anywhere.
What you pay reflects the work, not a rough estimate. That’s why we ask a few questions first and give you a clear quote before any work starts.
Why choose Mr Mastic in Three Bridges
- Sanitary silicone with an anti-fungal additive in wet areas
- We leave the area clean and tidy
- 4.9 on Google from 180+ five-star reviews
- We agree the colour with you first
Signs you need window mastic in Three Bridges
Water runs down the glass onto the sill, so the sill ends and the joint below the frame are common leak points. Failed sealant there lets rain into the wall or behind the frame.
The most common problems we see are:
- Gaps where the sill meets the wall
- Damp patches on the reveal after heavy rain
- A bead that does not match the frame
- Cracked or shrunken mastic around the frame
Managing a site like Pound Hill Junior School? Then larger buildings have plenty of frames, and the mastic around each one ages.
What your quote should include
- What product goes in the joint
- Whether they’re fully insured
- How long to leave it before use
- The length of the guarantee
What happens on the day
When we arrive, we start by going over the job with you. We protect the surfaces around the joints before we start. Most jobs take anything from an hour or two to a full day, depending on how many frames there are. For a job in Three Bridges, we agree the time, the access and parking before the day. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- We check how each frame can be reached safely.
- Old, cracked mastic is removed completely, along with any loose debris.
- Frame and wall are cleaned and must be dry before sealing.
- Backing rod fills deep voids and the sealant goes in on top.
- The joint is shaped to shed water and the area tidied.
How to prepare
- Tell us about any previous sealing or DIY attempts
- Mention any parking rules near the property
- Mention any leaks or damp you’ve noticed
Getting a quote
For a quick quote, get us on the phone, or send an email if you’d rather. Tell us about the joints that need doing and we will explain what’s involved.
Advice
Can I do it myself?
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
Overfilling a joint is a classic DIY mistake. A thick, smeared bead looks untidy and doesn’t move well, and the joint depth matters as much as the finish.
What the job involves on each surface
Timber windows & doors
Soft or rotten wood cannot be sealed successfully. If we find rot, we will tell you before going ahead, as that is a job for a joiner.
uPVC windows
Fitters’ mastic on plastic frames is sometimes thin and rushed. We cut it out, back any deep gaps and reseal properly.
Window mastic in Three Bridges: local notes
Crawley, which Three Bridges is part of, is one of England’s post-war new towns. With many homes from the post-war decades, replacement windows and doors are common. The mastic around replacement frames ages too, and gaps at sills and frame heads are where water gets in. 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.
For landlords with property near Three Bridges station, renewing tired window mastic between tenants heads off draught and damp complaints. In the older streets around St Barnabas', frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Three Bridges is about 1 mile east of Crawley, in West Sussex. Every kind of property in Three Bridges can book us for window mastic. Every job comes with our one-year guarantee. 371 places in West Sussex are on our list, large and small.
Postcode districts we cover here for window mastic: RH10. Streets in the area include Ash Road, Mill Road and North Road, and we cover them all. We also cover the places around Three Bridges: Pound Hill (1 mile north-east), Worth (1 mile south-east), Maidenbower (1 mile south-east), Tilgate (1 mile south-west) and Crawley (1 mile west). Within a short drive, we also cover Horsham (8 miles south-west), Haywards Heath (9 miles south), Burgess Hill (11 miles south), East Grinstead (7 miles east), Billingshurst (14 miles south-west) and Bewbush (3 miles west).
Around Three Bridges
Around Three Bridges, our work takes us to homes and buildings near Hazelwick School, Central Sussex College and Grattons Park and the streets around them. Three Bridges has its own railway station: Three Bridges station. Other landmarks nearby include Crawley Hospital (1.6 miles west) and Crawley Museum (1.2 miles west). Green spaces nearby include Tilgate Lake.
Honest limits
To be straight with you, some problems need a different trade:
- Condensation trapped between the panes
- Damp problems in the wall away from the window
- A frame that has rotted at the joint
If you’re not sure, just ring 0345 464 0079 or email us and we’ll give you a straight answer.
Where we work in Three Bridges
- Window sills
- Aluminium frames
- Composite doors
- Patio & French doors
- Timber windows & doors
- uPVC windows