Greater London · England
Hill End Window Mastic
Window mastic for Hill End, by sealant specialists with 20+ years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Cracked sealant at the sill ends
- White mastic on grey or black frames
- Whistling draughts around closed windows
Hill End: your questions answered
Can you help a landlord with a rental near Rickmansworth station?
Yes, rental work is part of what we do. You can ring 07833 053749 or send us an email with the address and a few details, and we’ll give you a fixed price before work begins.
Can you do window mastic in Hill End?
Yes. We work across London and the South East, and Hill End is part of that. You can phone 07833 053749 or email us and tell us what needs doing.
Do you work for hotels and businesses?
Yes. We’ve worked for hotels, offices and other businesses.
How long should I leave it?
That depends on the sealant used, so follow the cure time we give you when we finish.
Where are you based?
We work from Crawley. We cover Hill End and the rest of Greater London, along with the rest of our area.
Can you get sealant to suit coloured frames?
Yes, in most cases. Tell us the frame colour when you get in touch and we will use the nearest match.
What should I tell you?
A short description and the location. If we need more, we will ask.
Can I do it myself?
You can, for simple jobs. The key is preparation: remove all the old material and work on a clean, dry joint. If it doesn’t work out, we can redo it.
Window mastic for homes and businesses in Hill End
A cold draught around a closed window often comes from the frame edge. A new joint stops the air getting through and quietens the whistle on windy days. Where the air is getting in through the window itself, we’ll say so. If you are dealing with water coming in at the bottom corners of a door and hard, cracked sealant around windows, we can help. Mr Mastic is a specialist sealant company, not a general handyman, which means window mastic in Hill End is done by people who seal joints every day.
London homes have every kind of window, from timber sashes in period terraces to aluminium and uPVC in newer blocks. The mastic around them dries out and cracks with age, which is when draughts and damp patches appear in homes in Hill End.
Every job comes with our one-year guarantee.
- Where
- Hill End (UB9)
- Region
- Greater London
- Cover
- 12 months on all our work
- Price
- A clear price before we start
- Phone
- 07833 053749
- Last updated
- 26 October 2026
What happens on the day
Our applicators work methodically: protect, prepare, seal, tidy. Typically it takes a morning for a couple of windows and a door and we leave things clean and tidy. In Hill End, flats, stairs and shared entrances are part of the routine. If the building has a concierge, managing agent or access rules, tell us when you book.
- 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.
Getting ready for the visit
- Mention any sign-in or site rules at work premises
- Mention any parking rules near the property
- Move anything stored near the joints
Getting a quote
Asking for a quote is easy: tell us what needs doing and where, and roughly how big it is. Photos by email help us understand the job, and we’ll take it from there.
Advice
Landlords, agents and businesses in Hill End
From a single let to a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
Hotels need rooms back in use, so the work can be planned room by room around your bookings where we can. We have worked in hotels as well as homes and businesses.
Places near Hill End
Also in Hill End
What sealant work cannot fix
Some problems need a builder, plumber or other trade rather than us:
- A door that needs adjusting, rehanging or new seals
- Condensation trapped between the panes
- Broken hinges, locks or handles
If in doubt, phone 07833 053749 or send us an email and we’ll say what we think.
Joints and surfaces we work on
- Patio & French doors
- uPVC windows
- Window sills
- Aluminium frames
- Timber windows & doors
- Composite doors
When to call us in Hill End
Joints that are too thin or too deep fail early. A thin smear across a wide gap has nothing to it, and a gap filled solid can’t flex. Backing rod sets the right depth.
The problems people generally mention when they call are:
- Leaking joints at the ends of sills
- Untidy mastic left by window fitters
- Cracked internal joints between frame and plaster
- White mastic on grey or black frames
Letting a property close to Rickmansworth station? Then cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
Questions to ask before booking
- Whether they’re fully insured
- Whether all the old sealant comes out first
- Whether you can choose the colour
- What the cure time is
DIY sealant or a professional job?
A DIY attempt does not rule out a professional job. We remove it and do the joint properly, so tell us about it when you ask for a quote.
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 we quote for window mastic
We do not publish a price list, because no two jobs are the same. What we look at:
- Whether old sealant or filler has to be cut out
- The size of the job
- The type of sealant required
- Access and height
We don’t show prices on the website, because each job is priced on what it involves. For a quick quote, please ring 07833 053749 or drop us an email.
Asking for a quote
To make quoting easier, please include:
- Photos by email, if that’s easy
- Whether it has been sealed before
- The rough size of the job
- What the problem is, such as mould, gaps, leaks or cracking
If you’re in Hill End and need window mastic, call 07833 053749 or email us. A short description of the job and where it is helps us quote, and we’ll agree the price before any work begins.
What window mastic looks like in Hill End
In a converted house or block, who looks after the windows depends on the lease, so it’s worth checking before booking. Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you look after a building such as Harefield Infant School, the mastic around its windows and doors needs looking after like any other building’s. As a London address, Hill End can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Hill End is about 2 miles south-west of Rickmansworth, in Greater London. Our applicators cover window mastic for homes and businesses in Hill End and nearby. Hill End is one of 786 towns and villages in Greater London we cover.
Our applicators cover all of the UB9 postcode area for window mastic. If you need window mastic at a property on Hill End Road, Plough Lane and Springwell Lane or a nearby road, we can help. We also cover the places around Hill End: Harefield (1 mile south), Woodcock Hill (1 mile north-east), Batchworth (2 miles north-east), Mill End (2 miles north) and Batchworth Heath (2 miles east). Within a short drive, we also cover Kensington (14 miles south-east), Hampstead (14 miles east), Ruislip (4 miles south-east), Ealing (10 miles south-east), Hayes (7 miles south) and Finchley (13 miles east).
What’s near Hill End
Locally, jobs take us to homes and businesses close to The Green, The Harefield Academy and The King's Arms Public House and the streets around them. The nearest railway station is Rickmansworth station, roughly 1.9 miles north of the centre. Nearby you’ll also find Harefield Hospital (0.5 miles south) and Chiltern Open Air Museum (2.9 miles north-west). Open spaces near Hill End include Northmoor Hill Wood and Tumbling Bay.
Why it’s worth doing now in Hill End
Running fresh sealant over the old joint is tempting, but it won’t grip old, dirty sealant. It soon lifts and the leak carries on behind it. The old mastic has to come out. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and by the time it shows on a wall or ceiling in Hill End, the repair is bigger than the sealant job would have been.
Rather than a set price list, we look at what your job involves: the amount of work, the old material and the access. You’ll know the price before we begin.
What you get with us
- Colour agreed with you before we start
- Colour picked to suit the job
- ARBOMaster approved applicator
- Anti-fungal silicone where joints get wet
Take a look at how sealant jobs are priced or our reviews.