Greater London · England

Window Mastic in Petersham

Window mastic across Petersham and nearby, with old sealant always removed completely and a 12-month guarantee.

  • Cracked or shrunken mastic around the frame
  • Draughts coming in around windows and doors
  • Leaking joints at the ends of sills

Window mastic for Petersham homes and businesses

Keeping the joints in good condition

Simple care keeps the joints in good condition. We recommend:

  • Clean frames with a soft cloth and soapy water
  • Do not paint over the silicone
  • Keep paint and stain on wooden frames in good order
  • Walk round the house once a year and look at the joints

Try not to touch the new joint while it cures, following the cure time we give you. Don’t point a pressure washer at the joints.

Water trapped behind a failed joint can start rot in timber frames and sills. Once wood has rotted, it needs repair before it can be sealed, so early resealing is worth it.

Window mastic for homes and businesses in Petersham

Colour matters on a frame. We can seal in white, brown, anthracite grey, black or clear, so the bead blends with the window rather than framing it. We work on window sills, aluminium frames and composite doors, and common reasons people get in touch are black, perished sealant on frames and cold air getting in at the frame edge.

London’s Victorian and Edwardian terraces were built with timber sash windows, and many still have them or their replacements. Either way, the mastic between frame and brickwork is what stops draughts and rain getting in.

A one-year guarantee comes as standard, so you’re not left on your own once the job is done.

Mr Mastic applicator sealing the top of a white uPVC door frame on a red-brick house
Where
Petersham (TW10, TW1)
Wider area
Greater London
Cover
A year, on every job
Price
A clear quote up front
Phone
0345 464 0079
Last updated
26 October 2026

What the job involves on each surface

Timber windows & doors

On period timber windows, traditional sand mastic is sometimes the better choice. We can talk through the options.

uPVC windows

We clean the frame edge carefully so the plastic is not marked, then the sealant goes in between frame and wall and tooled smooth.

Quotes for window mastic in Petersham

The price is agreed before any work begins. It takes into account:

  • How many areas need sealing
  • When we can work, for business premises
  • How much old sealant there is and how hard it is to remove
  • How easy the joints are to reach

What you pay reflects the work, not a rough estimate. That is why we ask about the job first and send you a clear quote before work begins.

What we need to know

A few details help us give you an accurate quote. When you get in contact, it helps to mention:

  • What’s wrong with the joints now
  • Roughly how big the job is
  • Where the job is, and your postcode
  • How we’d reach the joints

There’s no standard price list. Instead, we give you a clear price for your job. To get started, ring 0345 464 0079 or send us an email.

DIY versus a professional finish

Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.

Too much sealant is as bad as too little. A thick, smeared bead looks untidy and does not move well, and getting the depth right matters as much as the look.

Windows and doors in Petersham

With historic houses such as Pembroke Lodge (about 0.5 miles south-east) nearby, there’s older building stock in the area around Petersham 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. In a converted house or block, who looks after the windows depends on the lease, so check that before booking.

As a London address, Petersham can be tricky for parking: tell us about permits, visitor bays or off-street space when you book. If you let a flat or house near St Margarets (London) station, sound mastic around windows and doors keeps out the draughts and damp that tenants notice first. Schools such as The Russell Primary School are buildings too, and its window and door frames need their mastic kept sound, just like a home’s.

Petersham is about 1 mile south of Richmond, in Greater London. Petersham gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Our Greater London coverage runs to 764 places, and Petersham is one of them. There’s also a page for London, about 10 miles away.

Here we cover the TW10 and TW1 postcode area for window mastic. If you need window mastic at a property on Sandy Lane, River Lane and Arosa Road or anywhere close by, we can help. Other places close to Petersham 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). Larger places within reach include 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

Around Petersham, our work takes us to homes and buildings near St Catherine's School, Grey Court School and Marble Hill Park, among other places. For rail, the closest station is St Margarets (London) station, roughly 0.9 miles north-west. A little further out are Bentall Centre (2.4 miles south) and Eel Pie Island Museum (1 mile west). For a walk, there’s Kew Gardens Lake and Richmond Hill.

Map of Petersham © OpenStreetMap contributors

Work for landlords, hotels and businesses

Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.

For anyone letting property in or around Petersham, jobs at different addresses can go on one quote. Just tell us the addresses and what each one needs.

Petersham questions

Can you help a landlord with a rental near St Margarets (London) station?

Yes. We work for letting agents and landlords as well as householders, and several properties can be quoted together. Just call 0345 464 0079 or send us an email with the address and what needs doing, and we will send you a clear quote.

Is parking a problem for a job in Petersham?

In much of London, parking needs planning: a visitor permit or a nearby bay makes the day run more smoothly.

How long will my window job take?

It depends on access, the old mastic and the size of the frames. We’ll tell you how long your job needs when we quote.

Can I paint over the new sealant?

Silicone generally won’t take paint. If you plan to paint, tell us first and we can use a paintable sealant where it suits the joint.

How do I get a quote for window mastic in Petersham?

The cost depends on the size of the job, access and how much old sealant has to come out. Ask us for a quote and we’ll talk you through it.

Does someone need to be in?

Access is agreed with you when the job is booked. Indoors, that generally means someone at home.

Are you fully insured?

Yes. We’re fully insured.

Can you do several jobs on one visit?

Yes. More than one area can be quoted together.

What happens on the day

Before we leave, we go over the finished joints with you. The visit itself usually takes a morning for a couple of windows and a door, depending on the amount of work. In Petersham, 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.

  1. We check how each frame can be reached safely.
  2. All the failed sealant is cut away.
  3. The surfaces are cleaned and left dry, and primed where the sealant calls for it.
  4. Deep voids are backed, then the sealant is gunned in.
  5. We tool the joint so water runs off, then clear up.

Preparing for the visit

  • Let us know about stairs, lifts or work at height
  • For business premises, tell us about site rules or sign-in
  • Keep children and pets away from the work area

Get a quote

Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we’ll talk you through what we’d do. When it suits you, ring 0345 464 0079 or send us an email.

Get a price

Advice

Honest limits

We’d rather tell you now than do work that won’t last, so these are the limits:

  • Soft or decayed wood in the frame
  • Worn gaskets, brush seals or a door that has dropped
  • A sash or casement that will not close properly

If in doubt, phone 0345 464 0079 or drop us an email and we will say what we think.

What we seal

  • Window sills
  • Timber windows & doors
  • Patio & French doors
  • Aluminium frames
  • uPVC windows
  • Composite doors
20+ yearsMastic and sealant specialists
ARBOMaster approvedApproved applicator for Arbo sealants
Fully insuredDomestic, commercial and hotels
One-year guaranteeOn every job