East Sussex · England
Sweethaws Window Mastic
Window mastic for Sweethaws and the surrounding area: the right sealant, proper preparation and a neat finish. Call for a quick quote.
- Hard, cracked sealant around windows
- Rain getting in at the frame or under the sill
- Rushed sealant from a window installation
What happens if it’s left?
A cracked joint around a frame lets rain into the wall. Left long enough, it can stain inside walls, spoil plaster and rot wooden frames. A reseal is a much smaller job. Older cottages and farmhouses around Sweethaws can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
We don’t 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.
Why Sweethaws customers choose us
- Over 20 years’ experience
- Tidy, careful work
- Every job guaranteed for a year
- We never seal over old sealant
Read what affects the cost and our reviews.
How we handle window mastic in Sweethaws
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 one-year guarantee on the work. Typical jobs include mastic that’s falling out in pieces and cracked internal joints between frame and plaster, on window sills, uPVC windows and timber windows & doors.
Outdoor sealant needs dry, clean surfaces, so work on frames around Sweethaws is planned for dry weather. Tell us about access to every side of the house, including upper-floor windows.
Every job is covered by our 12-month guarantee.
- Where
- Sweethaws (TN6)
- Region
- East Sussex
- Guarantee
- One year on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
The process
We keep the work tidy and contained to the area we’re working on, so you can get on with your day. The job usually takes a few hours for a few frames, or a day or more for a whole house. Somewhere as small as Sweethaws, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- Each frame is looked over and we agree which ones need resealing.
- The old mastic is cut out and scraped back to clean surfaces.
- Deep gaps get closed-cell backing rod to set the depth.
- A flexible exterior sealant is applied in a colour to suit the frame.
- We tool each bead neatly and check every joint is closed.
Before we arrive
- Where the joints are inside, avoid wetting them before we arrive
- Clear the area around the work
- Keep pets and children clear of the area while we work
Getting a quote
Want a quote for window mastic? Please ring 0345 464 0079 or drop us an email and tell us about the job. You will know what we plan to do, and what it will cost, before any work begins.
Advice
What we can’t put right
A few problems are outside what sealant work can do:
- Broken hinges, locks or handles
- Rotten timber, which needs a joiner first
- Worn gaskets, brush seals or a door that has dropped
Not sure which it is? You can call 0345 464 0079 or email us and we’ll tell you honestly.
What we seal
- uPVC windows
- Window sills
- Composite doors
- Timber windows & doors
- Patio & French doors
- Aluminium frames
Quotes for window mastic in Sweethaws
The price is agreed before any work begins. It takes into account:
- How much old sealant there is and how hard it is to remove
- The number and length of the joints
- Mould in or behind the old joints
- The number of rooms or windows
Leaving a failed joint generally makes the job bigger, not smaller. If you’re not sure whether it needs doing, call 0345 464 0079 or email us for an honest opinion and a quote.
Asking for a quote
To make quoting easier, let us know:
- Any previous sealing or DIY work
- How many joints, rooms or windows are involved
- The type of property
- What’s wrong with the joints now
For a quick quote, get us on the phone, or email us if that is easier. Describe what needs sealing and we will explain what’s involved.
Surface 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.
Patio & French doors
The joints around patio doors run a long way, top, sides and threshold. Most leaks start at the bottom corners, so we pay close attention there.
Landlords, agents and businesses in Sweethaws
Letting agents often deal with us directly. Tell us the address, the job and how access works and we’ll give you a quote.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s easy to sort out between tenants. Several properties can be quoted together.
Sweethaws: your questions answered
I let a flat near Crowborough station. Can you help?
Yes, we work for landlords and agents. Just call 0345 464 0079 or email us and tell us about the property, and we will give you a clear price.
Do you cover Sweethaws for window mastic?
Yes, Sweethaws 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, and we’ll give you a clear price.
Are you insured?
Yes. We’re fully insured, with over 20 years’ experience in sealant work.
Do you remove the old sealant?
Yes. Sealing over old sealant is the main reason resealing fails early, so we never do it.
Can you reach windows above the ground floor?
Yes, as long as they can be reached safely. Let us know about access when you ask for a quote and we’ll plan for it.
Can I paint over the new sealant?
Silicone generally won’t take paint. Let us know beforehand, and we will use a paintable product where it suits.
When is the sealant fully cured?
Different products cure at different speeds, so follow the cure time we give you.
Do you hold any approvals?
Yes. We’re approved under the ARBOMaster scheme, which is run for the Arbo sealant brand.
Places near Sweethaws
What else we do in Sweethaws
Frames and glazing around Sweethaws
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.
Managing a site like Beacon Academy? Then larger buildings have plenty of frames, and the mastic around each one ages.
Sweethaws is about 2 miles south-west of Crowborough, in East Sussex. From the centre of Sweethaws to the outskirts, we cover window mastic for every kind of property. Our East Sussex coverage runs to 289 places, Sweethaws among them. Our Crawley page covers work nearby (15 miles or so).
Here we cover the TN6 postcode area for window mastic. Neighbouring places we cover for window mastic include High Hurstwood (1 mile south), Crowborough (2 miles north-east), Fairwarp (2 miles south-west), Jarvis Brook (2 miles north-east) and Marden's Hill (2 miles north). Within a short drive, we also cover Lewes (12 miles south-west), Hailsham (13 miles south-east), Uckfield (5 miles south), South Malling (12 miles south-west), Heathfield (7 miles south-east) and Southover (13 miles south-west).
Around Sweethaws
We work in homes and buildings around The Crow & Gate inn, among other places. The nearest railway station is Crowborough station, about 2.2 miles east. Other landmarks nearby include Tickerage Castle (4.6 miles south) and Crowborough War Memorial Hospital (1.3 miles north-east). The countryside around Sweethaws includes Crowborough Country Park.
Signs you need window mastic in Sweethaws
Joint shape matters as much as the product. A thin smear across a wide gap has nothing to it, and a gap filled solid cannot flex. Backing rod sets the right depth.
The problems people usually mention when they call are:
- Cold air getting in at the frame edge
- Cracked internal joints between frame and plaster
- Hard, cracked sealant around windows
- Damp patches on the reveal after heavy rain
If you let a flat or house near Crowborough station, cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
What to look for in a quote
- What happens if the job turns out different
- What product goes in the joint
- When the joint can take water or movement
- What insurance they hold