Greater London · England
Window & door mastic in Strawberry Hill, Greater London
Window mastic for Strawberry Hill and the surrounding area: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Cracked sealant at the sill ends
- White mastic on grey or black frames
- Mastic that’s falling out in pieces
Window mastic for homes and businesses in Strawberry Hill
The mastic around a window or door seals the gap between the frame and the wall. When it cracks, hardens or pulls away, draughts and rain get in. Our applicators cut it out and replace it with a flexible, weatherproof sealant. If you are dealing with cracked internal joints between frame and plaster and whistling draughts around closed windows, we can help, on patio & French doors, aluminium frames and uPVC windows alike.
Much of London’s older housing was built with timber sash windows, some still in place and some long since replaced. Either way, the mastic between frame and brickwork is what stops draughts and rain getting in, in Strawberry Hill as anywhere.
A one-year guarantee comes with the work, just as it does everywhere we cover.
- Place
- Strawberry Hill (TW1, TW11, TW2)
- Wider area
- Greater London
- Guarantee
- 12 months on all our work
- Price
- A clear price before work begins
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
What affects the cost of window mastic
Call for a quick quote. The main things that affect it are:
- When we can work, for business premises
- The type of sealant required
- The size of the job
- How easy the joints are to reach
Combining jobs into one visit is usually more efficient than separate visits. We’ll give you a clear quote for the lot.
Helping us quote
There’s no need for technical detail. It helps if you can tell us:
- How many joints, rooms or windows are involved
- Whether it has been sealed before
- Photos by email, if that is easy
- Access, such as stairs, a lift or height
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we’ll explain how we’d tackle it. Whenever you’re ready, phone 0345 464 0079 or send us an email.
How it works
All our tools and materials come with us in the van. Once we have agreed what’s being done, we protect the area and start. It normally takes a few hours for a handful of frames, longer for a whole house. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. Mention any building rules, key holders or managing agents when you book.
- First we look at every frame and agree the list.
- Next the failed sealant is cut away and the joint cleaned.
- Where gaps are deep, backing rod goes in first.
- New exterior sealant goes on in a matching colour and is tooled smooth.
- Finally we tidy up and check each joint.
Before we arrive
- Mention any sign-in or site rules at work premises
- Tell us about any water getting in
- Try not to wet indoor joints just before the visit
Ask for a quote
Asking for a quote is easy: tell us what needs doing and where, and roughly how big it is. A few photos by email make the job easier to understand, and we will take it from there.
Advice
What happens if it’s left?
The work is quick compared with the damage it prevents: the visit takes a few hours for a few frames, or a day or more for a whole house. Wait for damp to appear and there may be plaster and decorating to sort out too. In a flat in Strawberry Hill, failed sealant seldom stays inside your own four walls: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
Instead of a standard rate, we look at what your job involves: the amount of work, the old material and the access. The price is agreed before we begin.
Why book with us
- Over 20 years’ experience
- 180+ five-star Google reviews
- We never seal over old sealant
- A sealant colour to suit the surroundings
Read how sealant jobs are priced and our reviews.
FAQs for Strawberry Hill
Do you work for landlords with property near Strawberry Hill station?
Yes, we work for letting agents and landlords. You can ring 0345 464 0079 or drop us an email with the address and a few details, and we will give you a fixed price before work begins.
Can you do window mastic in Strawberry Hill?
Yes. We work across London and the South East, and Strawberry Hill is part of that. You can ring 0345 464 0079 or drop us an email and tell us what needs doing.
How much does window mastic cost in Strawberry Hill?
The cost depends on the size of the job, access and how much old sealant has to come out. Call for a quick quote.
Is the work guaranteed?
Yes. Every job comes with our one-year guarantee, and we are fully insured.
Does someone need to be in?
Access is agreed with you when the job is booked. Indoors, that usually means someone at home.
Can you get sealant to suit coloured frames?
Yes, we choose a colour to suit the frame. Anthracite grey, black, brown and white cover most frames, with clear as an option.
Can I paint over the new sealant?
That depends on the product. Some hybrid sealants can be painted; silicone cannot. Mention any painting plans before work begins.
Is it OK to seal over old sealant?
No, because it fails. We remove every bit of old sealant first.
What window mastic looks like in Strawberry Hill
In London conversions and blocks, the lease decides who is responsible for the frames, 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.
Rented homes near Strawberry Hill station change hands often, and renewing tired window mastic between tenants heads off draught and damp complaints. In the older streets around Holy Trinity Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Strawberry Hill is about 1 mile south of Twickenham, in Greater London. Every kind of property in Strawberry Hill can book us for window mastic. Every job comes with our 12-month guarantee. Across Greater London, we cover 764 places, Strawberry Hill among them. London is on our list too, about 11 miles from Strawberry Hill.
Work in TW1, TW11 and TW2 is quoted and booked the same way as anywhere else. Local streets include Tower Road, Heath Road and Clive Road, all of which we cover. If you are just outside Strawberry Hill, we cover Fulwell (1 mile south-west), Eel Pie Island (1 mile north-east), Twickenham (1 mile north), Teddington (1 mile south) and Whitton (1 mile north-west). We also work in nearby towns such as London (11 miles east), City of Westminster (9 miles north-east), Marylebone (10 miles north-east), Kensington (7 miles north-east), St Pancras (11 miles north-east) and Shoreditch (13 miles north-east).
Landmarks near Strawberry Hill
In Strawberry Hill, that means homes and buildings near Archdeacon Cambridge's Church of England Primary School, Marble Hill Park and St Richard Reynolds Catholic High School. There’s a railway station in Strawberry Hill itself: Strawberry Hill station. Nearby you will also find Eel Pie Island Museum (0.8 miles north-east) and Bentall Centre (2.2 miles south-east). Green spaces nearby include Kew Gardens Lake and Ham Lands.
What we’re called out for in Strawberry Hill
Timber windows bring their own problems. Old mastic gets painted over and cracks under the paint, and the wood moves with damp as well as heat.
Keep an eye out for any of the following:
- Cracked internal joints between frame and plaster
- Rushed sealant from a window installation
- Black, perished sealant on frames
- Cracked or shrunken mastic around the frame
As a London address, Strawberry Hill can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Questions to ask before booking
- When the joint can take water or movement
- What preparation is included
- Which sealant they’ll use, and why
- Is VAT in the price?
Landlords, agents and businesses in Strawberry Hill
If you manage several properties in or around Strawberry Hill, several properties can go on one quote. Send us the addresses and the work at each, and photos by email help.
Whether it’s one flat or a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a one-year guarantee.
Nearby places to Strawberry Hill
What else we do in Strawberry Hill
Can I do it myself?
Some sealant jobs are within reach of a careful DIYer, 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.
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions.
Surface by surface
Window sills
Every drop off the glass ends up on the sill, so the joints at each end and underneath matter. They’re cut out and resealed with exterior sealant.
Patio & French doors
Water at the foot of a door frame isn’t always the mastic: blocked drain slots, worn brush seals and threshold details can let water in too. We look for the cause first.