Kent · England
Farningham Window Mastic
Specialist window mastic for Farningham: careful preparation, the right product and tidy work. Call for a quick quote.
- Cracked internal joints between frame and plaster
- Leaking joints at the ends of sills
- Damp patches on the reveal after heavy rain
About our window mastic in Farningham
A cold draught around a closed window often comes from the frame edge. Resealing that joint can make a room feel noticeably less draughty. If the draught is through the window seals instead, we’ll tell you. We are often asked to deal with draughty joints inside around the window and water coming in at the bottom corners of a door, on timber windows & doors, window sills and composite doors.
Outdoor sealant needs dry, clean surfaces, so work on frames around Farningham is planned for dry weather. Tell us about access to every side of the house, including upper-floor windows.
A one-year guarantee comes as standard, so you are not left on your own once the job is done.
- Location
- Farningham (DA4)
- Wider area
- Kent
- Cover
- 12 months on all our work
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Frames and glazing around Farningham
With historic houses such as Lullingstone Castle (about 1.8 miles south-west) nearby, there’s older building stock in the area around Farningham as well as newer homes. 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, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
In the older streets around Church of Saint Peter and Saint Paul, frames set in older brick or stone need a sealant that suits the wall as well as the frame. Managing a site like The Anthony Roper Primary School? Then its window and door frames need their mastic kept sound, just like a home’s.
Farningham is about 5 miles south of Dartford, in Kent. Every kind of property in Farningham can book us for window mastic. Every job comes with our one-year guarantee. Farningham is one of 922 places in Kent where we work. You can also see our page for London, about 16 miles away.
Postcode districts we cover here for window mastic: DA4. Streets in the area include High Street, London Road and South Hall Close, and we cover them all. Neighbouring places we cover for window mastic include Eynsford (1 mile south-west), Horton Kirby (1 mile north-east), Maplescombe (2 miles south-east), Speed Gate (2 miles east) and Fawkham Green (3 miles east). Within a short drive, we also cover Maidstone (15 miles south-east), Dartford (5 miles north), Sevenoaks (7 miles south), Gravesend (8 miles north-east), Tonbridge (13 miles south) and Northfleet (7 miles north-east).
Local landmarks in Farningham
In Farningham, that means homes and buildings near Pied Bull pub. For rail, the closest station is Eynsford station, about 1.4 miles south-west of the centre. Nearby you will also find Eynsford Castle (0.7 miles south-west) and Darenth Park Hospital (4.2 miles north). Green spaces nearby include The Warren.
DIY versus a professional finish
If you’re set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it doesn’t work out, we can still put it right.
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
How the visit works
Before we leave, we go over the finished joints with you and tell you how long to leave it. The visit itself usually takes a morning for a couple of windows and a door, depending on the size of the job. Somewhere as small as Farningham, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- First, we go round the frames with you and agree the list.
- We remove the old mastic and clean the frame edge and wall.
- Deep gaps get closed-cell backing rod to set the depth.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- We tool each bead neatly and check every joint is closed.
How to prepare
- Mention any parking rules near the property
- Mention any sign-in or site rules at work premises
- Mention any leaks or damp you’ve noticed
Ask for a quote
If you are in Farningham and need window mastic, ring 0345 464 0079 or email us. A short description of the job and where it is helps us quote, and we’ll agree the price before any work begins.
Related advice
For landlords and businesses
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements and we will give you a quote.
Failed sealant is one of the commonest items on a check-out report, and it’s quick to put right between tenancies. Several properties can go on one quote.
Why act early in Farningham
Not every sealant suits a window. Interior caulk and bathroom silicone aren’t made for exterior frame joints. An exterior, low-modulus sealant stays flexible in sun and frost. Older cottages and farmhouses around Farningham can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
No two jobs are quite the same, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all make a difference, and we’ll explain the quote if you ask.
Why choose Mr Mastic in Farningham
- Quality sealants from Arbo and Everbuild
- We agree the colour with you first
- Tidy, careful work
- Rated 4.9 stars on Google
Take a look at what affects the cost or what customers say.
Also near Farningham
More services for Farningham
Signs you need window mastic in Farningham
Joints that are too thin or too deep fail early. A thin smear across a wide gap has nothing to it, and a gap filled solid can’t flex. That is what backing rod is for.
The problems people normally mention when they call are:
- Whistling draughts around closed windows
- Cracked or shrunken mastic around the frame
- Cracked sealant at the sill ends
- Black, perished sealant on frames
Letting a property close to Eynsford station? Then cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
What to look for in a quote
- What the quote includes, VAT included or not
- What product goes in the joint
- Which colour the sealant will be
- What preparation is included
Surface by surface
Patio & French doors
Patio and French doors have the longest joints on most houses. The threshold and the bottom corners take the most water, so they get particular care.
uPVC windows
Some uPVC windows were sealed at fitting with a quick bead that never bonded. It comes out, deep gaps get backing rod and the joint is resealed.
Common questions in Farningham
Do you work for landlords with property near Eynsford station?
Yes, rental work is part of what we do. Just ring 0345 464 0079 or send us an email and tell us about the property, and we will give you a clear quote.
Can you do window mastic in Farningham?
Yes. We work across London and the South East, and Farningham is part of that. You can ring 0345 464 0079 or email us and let us know what needs doing.
Do you do commercial work?
Yes. Larger jobs can be planned room by room or area by area.
Do you have sealant for grey or black windows?
Yes. White, brown, anthracite grey, black and clear sealants are all available, so the joint suits the frame.
What information do you need?
Just the basics: where it is, what you’ve noticed and how we reach it. After that, simply ring 0345 464 0079 or email us.
What sealant do you use?
The product depends on the job: sanitary silicone where it gets wet, and sealants suited to movement or weather elsewhere. Brands we use include Arbo and Everbuild.
Can new sealant go over the old?
No, and we never do. It can look neat for a few weeks, but the new bead soon lifts. Removing the old sealant completely is the only lasting way.
Do you guarantee window mastic?
Yes. All our work carries a 12-month guarantee, and we’re fully insured.
What affects the quote in Farningham
We do not publish a price list, because jobs vary so much. The quote depends on:
- Mould in or behind the old joints
- Access and height
- Any working-time requirements on site
- Whether old sealant or filler has to be cut out
Rather than a set price list, we look at what your job involves: how many joints, what’s in them now and how we reach them. You’ll know the price before we begin.
What to tell us for a quote
The more you tell us, the more accurate the quote. When you ask for a quote, tell us:
- If someone has resealed it before
- How many joints, rooms or windows are involved
- Access, such as stairs, a lift or height
- Where the job is, and your postcode
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and add photos by email if you can.