Greater London · England
Strawberry Hill Sand Mastic
Sand mastic in Strawberry Hill from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Cracked mastic round a front door frame
- Wind and rain getting in round a sash window
- Crumbling sand mastic round a window
Looking after it afterwards
Good habits help new joints last longer. Our tips:
- Plan mastic work ahead of painting
- Have rotten timber repaired before new mastic goes in
- Leave the new mastic unpainted
- Keep sills and gutters clear so water drains away
Leave the new mastic alone while it firms up. It forms a skin fairly soon but needs longer to fully harden.
It’s best to renew mastic before painting the windows. Paint over cracked mastic only covers it up.
Sand mastic in Strawberry Hill, done properly
On many period windows, sand mastic looks right and suits the building. On modern frames we’d normally use a flexible sealant and we will explain which is best for yours. We are often asked to deal with wind and rain getting in round a sash window and old sand mastic that has cracked, crumbled or fallen out, on sash and case windows, stone surrounds and period & listed homes.
London has a lot of flats and conversions, where windows are often on upper floors. Who looks after the outside of the frames can depend on the lease, so check that first, and access in Strawberry Hill is something to talk through when you book.
All our work comes with a 12-month guarantee, wherever you are in Greater London.
- Place
- Strawberry Hill (TW1, TW11, TW2)
- Wider area
- Greater London
- Guarantee
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Windows and doors in Strawberry Hill
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. With historic houses such as Strawberry Hill House (about 0.1 miles south-west) nearby, there’s older building stock in the area around Strawberry Hill as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic.
If you live in an older home near Holy Trinity Church, frames set in older brick or stone need a sealant that suits the wall as well as the frame. For site and facilities teams at buildings such as Kneller Hall Senior School, the mastic around its windows and doors needs looking after like any other building’s.
Strawberry Hill is about 1 mile south of Twickenham, in Greater London. For sand mastic in and around Strawberry Hill, please phone 0345 464 0079 or send us an email for a quick quote. We are based in Crawley and cover Greater London, Strawberry Hill included. Across Greater London, we cover 764 places, and Strawberry Hill is one of them. We also work in London, about 11 miles from Strawberry Hill.
Here we cover the TW1, TW11 and TW2 postcode area for sand mastic. You’ll find streets such as 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). Larger places within reach include 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
Locally, jobs take us to homes and businesses close to Archdeacon Cambridge's Church of England Primary School, Marble Hill Park and St Richard Reynolds Catholic High School and the streets around them. There’s a railway station in Strawberry Hill itself: Strawberry Hill station. Well-known places in the area include Eel Pie Island Museum (0.8 miles north-east) and Bentall Centre (2.2 miles south-east). For a walk, there’s Kew Gardens Lake and Ham Lands.
Why deal with it now?
New mastic over crumbling mastic won’t hold. Raking out and preparing the joint gives it a sound base so the new mastic stays put. Damp from a failed joint spreads quietly in older London brickwork and timber, and once it shows in Strawberry Hill, the repair is bigger than a sealant job.
Every job is a little different, so each one gets its own quote. Size, access and the product the joint needs all make a difference.
Why Strawberry Hill clients choose us
- Approved under the ARBOMaster scheme
- Over 20 years’ experience
- A 12-month guarantee on all work
- Full insurance on every job
Read our cost guide or customer reviews.
Also near Strawberry Hill
Other services in Strawberry Hill
Quotes for sand mastic in Strawberry Hill
Every job gets its own quote. This is what makes a difference:
- The amount of work
- How much old sealant there is and how hard it is to remove
- Working hours on commercial sites
- How many rooms, windows or areas are involved
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether we need extra access for height. We take all of that into account in your quote.
What to tell us for a quote
To help us quote quickly, please include:
- If it’s domestic, commercial or a hotel
- The rough size of the job
- What’s wrong with the joints now
- Any access issues, like height or stairs
Want a quote for sand mastic? Please call 0345 464 0079 or email us with a few details. You’ll know what we plan to do, and what it will cost, before any work begins.
Surface by surface
Timber door frames
Door frames get knocked and soaked, so their mastic can fail sooner. We rake it out and renew it.
Sash and case windows
Sash windows are where we do most sand mastic work. Each joint round the box is raked out and renewed.
Work for landlords, hotels and businesses
From a single let to a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a 12-month guarantee.
Hotels need rooms back in use, so we plan the work room by room. We have worked in hotels as well as homes and businesses.
What we are called out for in Strawberry Hill
Age is the main cause. Sand mastic is a maintenance item like any pointing and how long it lasts depends on the weather it faces.
Look out for these signs:
- Open joints round the window box
- Cement or filler used on old window joints that has cracked
- Silicone on a period window that looks wrong
- Failed mastic on an exposed elevation
If you let a flat or house near Strawberry Hill station, older sash windows in a rental need their mastic kept sound to keep the weather out.
What to look for in a quote
- What preparation is included
- Whether VAT is included
- What guarantee comes with the work
- Whether all the old sealant comes out first
Strawberry Hill questions
Is parking an issue for sand mastic in Strawberry Hill?
Parking in Strawberry Hill, as in most of London, takes a little planning: a visitor permit or a nearby bay makes the day run more smoothly.
Do you work for landlords with property near Strawberry Hill station?
Yes. We work for landlords and agents as well as homeowners. You can ring 0345 464 0079 or email us with the details for a clear quote.
What’s sand mastic made of?
Sand plus a binder based on linseed oil. It’s built up in the joint by hand and finished to sit neatly against the masonry.
What do you put in the joint?
It depends on the joint: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.
Is consent needed for window work on a listed home?
Your local planning authority is the one to ask. They decide whether consent is needed for work to your windows.
Is sand mastic better than silicone for my windows?
That depends on your windows. On many period windows, sand mastic looks right and suits the building and newer frames usually get a flexible sealant.
Do you cover Strawberry Hill?
Yes. We cover Strawberry Hill. To book, call 0345 464 0079 or email us.
Can you replace silicone on a period window with sand mastic?
Yes, it’s a common request. All the old silicone is removed first so the mastic beds in well.
The process
The work is kept neat and contained to the area we are working on, so you can get on with your day. Expect the work to take a few hours per window, depending on the condition of the joints. In Strawberry Hill, as in most of London, parking needs a little planning. It helps if you can point us to a visitor permit or a bay close to the door.
- First, we look at the surrounds with you and agree what needs doing.
- The loose and crumbling mastic is raked out and the joint cleaned.
- Large voids are packed out first, so the mastic is not too thick.
- The mastic is mixed, pressed into the joint by hand and shaped.
- The finish is dressed so it sits neatly against the stone or brick.
Getting ready for the visit
- Mention any sign-in or site rules at work premises
- Keep children and pets away from the work area
- Mention any parking rules near the property
Get a quote
If you’re in Strawberry Hill and need sand mastic, call 0345 464 0079 or email us. Tell us what the problem is and where, and we’ll agree the price before any work begins.