Greater London · England
Gunnersbury Sand Mastic
We cover Gunnersbury for traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old sealant removed completely, joints prepared properly and every job guaranteed for a year.
- A silicone bead on a sash window that spoils the look
- Failed mastic on an exposed elevation
- Mastic round period door frames that has failed
How we quote for sand mastic
Your quote is based on your job. We look at:
- How many rooms, windows or areas are involved
- When we can work, for business premises
- The number and length of the joints
- Which sealant suits the joint
There are no prices on our website, because each job is priced on what it involves. For a quick quote, please call 0345 464 0079 or drop us an email.
What we need to know
When you call or email, it’s useful to know:
- A few photos by email, if you can
- Any access issues, like height or stairs
- The problem you’ve noticed
- Whether it’s a home or a business
The more we know about the job, the more useful the quote. Tell us where the job is, what’s wrong and how much there is, and email pictures if that’s easy.
Sand mastic in Gunnersbury, done properly
Old sand mastic cracks, crumbles and falls out over time, leaving gaps round the window. Renewing it closes the gap and tidies the surround. Typical jobs include draughty sash windows at the surround and cracked mastic round a front door frame, on timber door frames, tenement windows 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 Gunnersbury is something to talk through when you book.
All our work is covered by our 12-month guarantee, wherever you are in Greater London.
- Location
- Gunnersbury (W4, W3, TW8)
- Region
- Greater London
- Guarantee
- One year on every job
- Quotes
- A clear price before we start
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Different surfaces, different methods
Period and listed homes
On a listed home or in a conservation area, the right material matters. Sand mastic is often the preferred finish.
Brick reveals
An open joint at a brick reveal lets weather in. New mastic seals the gap.
Places near Gunnersbury
What else we do in Gunnersbury
FAQs for Gunnersbury
Is parking a problem for a job in Gunnersbury?
Parking in Gunnersbury, as in most of London, takes a little planning: a visitor permit or a nearby bay makes the day run more smoothly.
I let a flat near Gunnersbury station. Can you help?
Yes, landlords and agents are among the people we work for. Just phone 0345 464 0079 or drop us an email with the address and what needs doing, and we will give you a clear price.
What do you put in the joint?
Products from Arbo and Everbuild, among others, chosen to suit the joint. We will tell you what we’re using and why.
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.
Do I have to be there?
We need access to the joints, so we will agree that with you when we book. For inside work, that normally means someone being in.
What should I tell you?
The location, the problem and the rough size of the job. Photos by email help too.
Do the sealants smell?
It depends on the product. Some smell for a while, some hardly at all.
Is it worth trying it myself?
It depends on the job. High-level, external movement and fire-rated joints are professional jobs.
What we do, step by step
Good joint work is mostly preparation, so that is where we spend the time. Joints are cleaned back and dried before anything new goes in. All told, the work takes anything from a few hours to a full day, depending on how many windows. 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.
- We look at the surrounds with you and agree the joints to renew.
- Old mastic and any loose material are raked out.
- We pack any deep voids first.
- The sand mastic is mixed and pressed into the joint by hand.
- We dress the finish so it sits neatly against the masonry.
Preparing for the visit
- Clear the area around the work
- Tell us if parking is tricky
- Let us know about stairs, lifts or work at height
Get a quote
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we’ll talk you through what we’d do. When it suits you, call 0345 464 0079 or drop us an email.
Related advice
Leave it or put it right?
A silicone bead can be quicker, but on period stone or brick it often looks out of place. Sand mastic suits the building and finishes neatly against the masonry. In a flat in Gunnersbury, failed sealant seldom stays inside your own four walls: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
Leaving a failed joint usually makes the job bigger, not smaller, as water and mould keep getting in. If you’re not sure whether it needs doing, call 0345 464 0079 or send us an email and we’ll give you an honest view and a quote.
What you get with us
- 4.9 on Google from 180+ five-star reviews
- Sanitary silicone with an anti-fungal additive in wet areas
- Full insurance on every job
- Trusted Arbo and Everbuild sealants
Take a look at what affects the cost or what customers say.
Gunnersbury homes and the weather
Historic houses like Gunnersbury Park (about 0.7 miles north-west) are a reminder that the area around Gunnersbury has older buildings as well as new. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window. The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Gunnersbury is in London, so parking needs planning: tell us about permits, visitor bays or off-street space when you book. Schools such as Strand-on-the-Green Junior School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages.
Gunnersbury is about 1 mile south of Acton, in Greater London. Whether you are in the middle of Gunnersbury or further out, we cover sand mastic for every kind of property, from flats and houses to offices and hotels. Gunnersbury is one of 764 towns and villages in Greater London we cover for sand mastic. For nearby work, see our London page.
Work in W4, W3 and TW8 works the same way as everywhere else we cover. Local streets include Kew Road, Kent Road and Power Road, and we cover them all. Gunnersbury is on the A3000, which makes it straightforward to reach with everything needed for sand mastic. Other places close to Gunnersbury include Strand-on-the-Green (1 mile south), Kew (1 mile south), Grove Park (1 mile south-east), Chiswick (1 mile east) and Turnham Green (1 mile south-east). We also work in nearby towns such as London (8 miles east), City of Westminster (6 miles east), Marylebone (6 miles east), Kensington (3 miles east), St Pancras (7 miles east) and Shoreditch (9 miles east).
Landmarks near Gunnersbury
Around Gunnersbury, our work takes us to homes and buildings near Clayton Hotel Chiswick, Kew College Prep and Ark Acton Academy. Nearby too are Turnham Green (0.5 miles east) and Library for Iranian Studies (1 mile north). Gunnersbury has its own railway station: Gunnersbury station. Other landmarks nearby include Barnes Hospital (2 miles south-east) and Livat Hammersmith (2.1 miles east). Open spaces near Gunnersbury include Kew Gardens Lake and Castlebar Hill.
Do you need sand mastic in Gunnersbury?
Rain on the window surround works into any crack and loosens it further. Exposed elevations normally fail first.
Any of these means the joints need attention:
- Mastic round period door frames that has failed
- Gaps between timber frames and stone or brick
- Window mastic to renew ahead of painting
- Cement or filler used on old window joints that has cracked
For an older house near a landmark such as St Michael's Church, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
What to look for in a quote
- Is VAT in the price?
- How much experience the applicator has
- Whether all the old sealant comes out first
- What happens if they find a problem under the old sealant
Honest limits
Sealant is not the answer to every problem, and we’d rather say so up front. Sealant won’t put right:
- Decisions on consent for listed homes
- Decayed frames that need repair
- Sashes that rattle, stick or won’t open
If you are not sure, just phone 0345 464 0079 or send us an email and we’ll give you a straight answer.
Surfaces we seal
- Brick reveals
- Stone surrounds
- Sash and case windows
- Period & listed homes
- Timber door frames
- Tenement windows
Work for landlords, hotels and businesses
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.
We also work for property managers and facilities teams in Gunnersbury and across Greater London. Several sites can be quoted together, and we are fully insured.