Medway · England

Window & door mastic in Gillingham, Medway

We cover Gillingham for mastic around window and door frames, sills and patio doors. Old sealant removed completely, joints prepared properly and a one-year guarantee.

  • Mastic that’s falling out in pieces
  • Gaps between the frame and the inside reveal
  • Gaps where the sill meets the wall

Window mastic for Gillingham homes and businesses

Aftercare tips

To keep the joints looking good and working properly:

  • Avoid harsh chemicals near the mastic
  • Ventilate rooms so frames do not stay wet inside
  • Check the mastic once a year
  • Don’t paint over the silicone

Wipe the frames with soapy water when you clean the windows, and keep solvents and harsh chemicals off the joint.

Leaks normally show up in wet, windy weather, but sealant goes on best when frames and walls are dry. Sorting cracked mastic early means the joint is sound before the bad weather.

Window mastic in Gillingham

Every window and door frame has a gap around it, and mastic is what closes it. When it cracks, hardens or pulls away, draughts and rain get in. The old mastic is removed and the joint resealed with a flexible exterior sealant. We work on composite doors, aluminium frames and window sills, and the jobs we see most are untidy mastic left by window fitters and white mastic on grey or black frames.

With a large rental market, Gillingham has plenty of windows that landlords need to keep weathertight. Gaps around a frame let in draughts and water, and tenants notice.

All our work is covered by our 12-month guarantee.

Location
Gillingham (ME8, ME7, ME4, ME5)
Wider area
Medway
Cover
12 months on all our work
Quotes
A clear quote up front
Telephone
0345 464 0079
Page updated
26 October 2026
Mr Mastic applicator sealing the top of a white uPVC door frame on a red-brick house

When it is not the sealant

Some problems need a builder, plumber or other trade rather than us:

  • Damp problems in the wall away from the window
  • A sash or casement that will not close properly
  • Worn gaskets, brush seals or a door that has dropped

Not sure which it is? You can ring 0345 464 0079 or drop us an email and we’ll tell you honestly before you book.

What we seal

  • Patio & French doors
  • uPVC windows
  • Timber windows & doors
  • Aluminium frames
  • Composite doors
  • Window sills

Why it’s worth doing now in Gillingham

Working on frames from a ladder with a sealant gun isn’t easy, especially on upper floors. We cut out properly, back deep gaps and tool every joint neatly, in a sealant suited to the wall. In a large rental market like Gillingham, tired sealant leads to tenant complaints about mould, damp and leaks. Sorting it between tenancies is easier than dealing with it mid-let.

Some things make a job bigger or smaller: the old material and how easily it comes out, whether mould needs treating, and whether we need extra access for height. We take all of that into account in your quote.

Why us?

  • White, clear, grey or coloured to suit, where the product allows
  • Domestic, commercial and hotel work
  • 20+ years of sealant experience
  • You choose the colour before work begins

See how sealant jobs are priced and what customers say.

Landlords, agents and businesses in Gillingham

We also work for property managers and facilities teams in Gillingham and across Medway. Several sites can go on one quote, and we’re fully insured.

A neglected joint can let water reach the structure, which matters even more when someone else lives there. Resealing at the right time is simple maintenance.

What happens on the day

The work is kept neat and contained to the joints we’re treating, so you can carry on as normal. Expect the work to take most of a day for a typical house, less for a few frames, and we explain the cure time before we leave. For homes and businesses in busier parts of Gillingham, parking needs a little planning. For flats, mention stairs, lifts and shared entrances as well.

  1. We check how each frame can be reached safely.
  2. All the failed sealant is cut away.
  3. Frame and wall are cleaned and must be dry before sealing.
  4. Backing rod fills deep voids and the sealant goes in on top.
  5. We tool the joint so water runs off, then clear up.

Before we arrive

  • Mention any leaks or damp you’ve noticed
  • Let us know about stairs, lifts or work at height
  • Tell us about any previous sealing or DIY attempts

How to get a quote

Every job is quoted individually, so start by telling us what you need. Just call 0345 464 0079 or email us with the details, and pictures are welcome.

Ask for a quote

Related advice

Window mastic in Gillingham: local notes

Gillingham is close to the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. That is hard on the mastic around window and door frames, especially on the side facing the sea. London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.

If you live in an older home near Holy Trinity Church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. Managing a site like Featherby Junior School? Then larger buildings have plenty of frames, and the mastic around each one ages. Rented homes near Gillingham (Kent) station change hands often, and renewing tired window mastic between tenants heads off draught and damp complaints.

Gillingham is about 30 miles east of London, in Medway. If you need window mastic in Gillingham, it’s easy to get a quote: please ring 0345 464 0079 or email us. We cover Medway from our Crawley base, Gillingham included. Gillingham is one of 68 towns and villages in Medway where we work for window mastic. You can also see our page for Chelmsford, roughly 26 miles from Gillingham.

Every address in ME8, ME7, ME4 and ME5 is covered for window mastic, from the main roads to the quietest streets. If you need window mastic at a property on Leeds Square, London Road and Dorset Square or anywhere close by, we can help. With the A2 and A231 close by, Gillingham is easy for our applicators to reach for window mastic. If you are just outside Gillingham, we cover Twydall (1 mile east), Lower Twydall (1 mile north-east), Grange (1 mile north), Darland (1 mile south-west) and Hale (1 mile south-west). Further out, we also cover Rochester (4 miles west), Strood (4 miles west), Lordswood (3 miles south-west), Hoo St Werburgh (4 miles north), Rochester Riverside (3 miles north-west) and Walderslade (3 miles south-west). Being one of Medway’s larger places, Gillingham has homes, rented property and businesses of every kind.

Near you in Gillingham

We work in homes and buildings around The Robert Napier School, The Robert Napier School and The Star pub. Gillingham’s nearest station is Gillingham (Kent) station, roughly 1.5 miles north-west. A little further out are Medway Maritime Hospital (1.6 miles west) and Six Poor Travellers House (3.3 miles west). Not far away are Blue Bell Hill and Bishop Saltings.

Map of Gillingham © OpenStreetMap contributors

Gillingham: your questions answered

Is Gillingham in your area for window mastic?

Yes. We work across London and the South East, and Gillingham is part of that. You can ring 0345 464 0079 or drop us an email and tell us what needs doing.

Do you work for landlords with property near Gillingham (Kent) station?

Yes. We work for landlords and letting agents as well as householders. Just phone 0345 464 0079 or email us with the address and what needs doing, and we will send you a clear quote.

Which products do you use?

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.

Do you work on first-floor windows?

Yes, as long as they can be reached safely. Tell us about access when you get in touch so we can plan the job.

Do you do commercial work?

Yes. Commercial and hotel work is a large part of what we do. We can talk about working times when we quote.

Do I have to be there?

It depends on the job. For work indoors, someone needs to let us in.

Can resealing stop a draught around my window?

Often, yes. The gap between frame and wall is a common source of draughts, and sealing the inside and outside joints closes that path.

Is the new sealant paintable?

Most silicone cannot be painted. If you plan to paint, tell us first and we can use a paintable sealant where it suits the joint.

Different surfaces, different methods

Window sills

Stone and concrete sills have their own joints, including the one between the sill and the frame above. Those are sealed with a product suited to stone or concrete.

Patio & French doors

Not every patio door leak is a mastic problem: blocked drain slots, worn brush seals and threshold details can let water in too. We check before we reseal.

Should I try it myself first?

A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly, so just mention it when you contact us.

Sealing over old silicone is the commonest DIY error. New silicone will not bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.

20+ yearsMastic and sealant specialists
ARBOMaster approvedApproved applicator for Arbo sealants
Fully insuredDomestic, commercial and hotels
One-year guaranteeOn every job