Greater London · England
Sand mastic for sash & case windows in Petersham, Greater London
Sand mastic in Petersham from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Open joints round the window box
- Mastic dropping out of the joint
- Cracked mastic round a front door frame
About our sand mastic in Petersham
For a listed home or one in a conservation area, ask your local planning authority if consent is needed before window work. Like-for-like sand mastic is often the preferred finish. We work on tenement windows, timber door frames and brick reveals, and common reasons people get in touch are cement or filler used on old window joints that has cracked and crumbling sand mastic round a window.
Many London homes are flats, with windows high above the street. Who looks after the outside of the frames can depend on the lease, so check that first.
Your job is guaranteed for a year, as with all our work.
- Location
- Petersham (TW10, TW1)
- Wider area
- Greater London
- Guarantee
- A year, on every job
- Price
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
FAQs for Petersham
Is parking an issue for sand mastic in Petersham?
In much of London, parking needs planning: a visitor permit or a nearby bay makes the day run more smoothly.
Can you help a landlord with a rental near St Margarets (London) station?
Yes. We work for landlords and letting agents as well as homeowners, and several properties can go on one quote. You can call 0345 464 0079 or send us an email with the details for a clear quote.
Do you do commercial work?
Yes. We’ve worked for hotels, offices and other businesses, and we are fully insured.
Is it messy?
Tidy work is part of the job. Nearby surfaces are protected, and we clear up when we are done.
Will the old sealant be removed?
Yes, always, and completely. New sealant will not bond properly to old, so any old material comes out before anything new goes in.
Do I need to be at home?
We need access to the joints, so we’ll agree that with you when we book. For inside work, that normally means someone being in.
What do you put in the joint?
Quality sealants from brands including Arbo and Everbuild, chosen to suit the joint. We will tell you what we’re using and why.
Can you match the sealant colour?
Yes. Sealants come in white, clear, grey and other colours, and we will agree it with you first.
Also near Petersham
Also in Petersham
Petersham homes and the weather
In a converted house or block, who looks after the windows depends on the lease, so check that before you book. Historic houses like Pembroke Lodge (about 0.5 miles south-east) are a reminder that the area around Petersham has older buildings as well as new. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
Managing a site like The Russell Primary School? Then larger buildings have plenty of frames, and the mastic around each one ages. If you let a flat or house near St Margarets (London) station, cracked sand mastic around sash windows lets in the draughts tenants complain about.
Petersham is about 1 mile south of Richmond, in Greater London. For sand mastic in and around Petersham, it’s easy to get a quote: please phone 0345 464 0079 or send us an email. We are based in Crawley and cover Greater London, Petersham included. Petersham is one of 764 places in Greater London where we work for sand mastic. There’s also a page for London, roughly 10 miles from Petersham.
Here we cover the TW10 and TW1 postcode area for sand mastic. Sand mastic is available to properties on Sandy Lane, River Lane and Arosa Road. Neighbouring places we cover for sand mastic include Richmond (1 mile north), Ham (1 mile south), Eel Pie Island (1 mile west), St Margarets (1 mile north-west) and Strawberry Hill (1 mile south-west). Further out, we also cover London (10 miles east), City of Westminster (8 miles north-east), Marylebone (8 miles north-east), Kensington (6 miles north-east), St Pancras (10 miles north-east) and Shoreditch (11 miles north-east).
Near you in Petersham
We work in homes and buildings around St Catherine's School, Grey Court School and Marble Hill Park, among other places. Petersham’s nearest station is St Margarets (London) station, roughly 0.9 miles north-west of the centre. A little further out are Bentall Centre (2.4 miles south) and Eel Pie Island Museum (1 mile west). Green spaces nearby include Kew Gardens Lake and Richmond Hill.
What affects the cost of sand mastic
For a quick quote, just ask. What matters most is:
- The product the joint needs
- Any working-time requirements on site
- The number of rooms or windows
- Whether there’s mould to deal with
What it costs depends on how much there is to do, how hard the old material is to remove and how easy the joints are to reach. You will have a clear quote before any work starts, so you know where you stand.
Helping us quote
What to tell us when you ask for a quote:
- The rough size of the job
- Any previous sealing or DIY work
- What the problem is, such as mould, gaps, leaks or cracking
- Where the job is, and your postcode
If you are in Petersham and need sand mastic, ring 0345 464 0079 or drop us an email. Tell us what the problem is and where, and you will get a clear quote before work begins.
How the visit works
Our applicators work methodically: protection first, then preparation, sealing and a tidy-up. Typically it takes a few hours per window, depending on the condition of the joints. In a London area like Petersham, the main things to plan are parking and access: let us know about parking, the floor we’ll be working on and any lift or shared entrance.
- Each surround is checked first.
- The joint is raked out and cleaned.
- We fill deep gaps so the new mastic isn’t too thick.
- We point the joint with sand mastic by hand.
- The finish is dressed neatly.
Before we arrive
- Clear items away from the joints we’re working on
- Where the joints are inside, avoid wetting them before we arrive
- Mention any leaks or damp you’ve noticed
Ask for a quote
Want a quote for sand mastic? Please phone 0345 464 0079 or drop us an email and tell us about the job. We’ll explain what we’d do and send you a clear quote before work begins.
Read more
Different surfaces, different methods
Period and listed homes
A traditional finish suits a period property.
Stone surrounds
The stone is treated with care when the old mastic comes out.
Landlord and commercial work in Petersham
Whether it’s one flat or a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
Why act early in Petersham
A silicone bead can be quicker, but it can look wrong on a period surround. Sand mastic suits the building and finishes neatly against the masonry. In a flat in Petersham, 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.
Every job is a little different, so we quote each one individually. Size, access and the product the joint needs all play a part, and we’ll explain the quote if you ask.
What you get with us
- Any old sealant cut out fully, not covered over
- Over 20 years’ experience
- 4.9 on Google from 180+ five-star reviews
- Neat joints and a tidy finish
Read what affects the cost or our reviews.
What we are called out for in Petersham
Rain on the window surround works into any crack and pushes it out. Exposed elevations usually fail first.
Any of these means the joints need attention:
- Gaps where the frame meets the masonry
- Tired mastic found when preparing windows for paint
- Modern sealant on a period surround
- Draughty sash windows at the surround
Homes close to St Peter's Church include some older properties, and the joint between an old wall and a newer frame is generally the first place rain gets in.
Questions to ask before you book
- When the joint can take water or movement
- What product goes in the joint
- Whether VAT is included
- What happens if the job turns out different
DIY versus a professional finish
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.