Buckinghamshire · England
Lee Common Window Mastic
Window and door frames in Lee Common need attention? We cut out the old, prepare the joints and apply the right sealant, and the work is guaranteed for a year.
- Gaps between the frame and the inside reveal
- Hard, cracked sealant around windows
- Damp patches on the reveal after heavy rain
About our window mastic in Lee Common
Most frames have an outside joint and an inside one. Outside, the mastic keeps rain out; the internal joint closes the gap to the plaster and stops draughts. We seal one or both, depending on what’s needed. Common call-outs are for cracked internal joints between frame and plaster and rushed sealant from a window installation, on patio & French doors, timber windows & doors and aluminium frames.
Somewhere as small as Lee Common, older homes often have timber frames set in stone or brickwork. Older buildings like these do not always suit modern silicone, and sometimes a traditional sand mastic is the better choice.
There’s a 12-month guarantee on every job, large or small.
- Place
- Lee Common (HP16)
- Region
- Buckinghamshire
- Guarantee
- 12 months on all our work
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
How the visit works
There is not much for you to do on the day. Point us to the joints and we’ll get on with it. The work itself takes a few hours for a few frames, or a day or more for a whole house from start to finish. In a small place like Lee Common, access is usually the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- First, we confirm safe access to each frame.
- Old, cracked mastic is removed completely.
- Frame and wall are cleaned and must be dry before sealing.
- Backing rod fills deep voids and the sealant goes in on top.
- We tool the joint so water runs off, then clear up.
How to prepare
- Clear the area around the work
- Tell us about any water getting in
- Tell us about any previous sealing or DIY attempts
Get a quote
For a quote, phone 0345 464 0079 or email us and tell us where the job is and what the problem looks like. You will have a clear quote before work begins.
Related advice
Can I do it myself?
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Lee Common: your questions answered
Is Lee Common in your area for window mastic?
Yes. We work across London and the South East, and Lee Common is part of that. You can ring 0345 464 0079 or drop us an email and tell us what needs doing.
Is Lee Common within the area you cover?
Yes, we do. We work across London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
How long will my window job take?
That depends on the number of frames, how they’re reached and the state of the old mastic. We’ll tell you how long your job needs when we quote.
I rent my home. Can I book you?
Yes. Check with your landlord; we can send the quote to them too.
What do you put in the joint?
We choose the sealant for the joint, not the other way round. Movement, water and weather all affect the choice, and we’ll explain our choice.
Are you an approved applicator?
Yes. We are an ARBOMaster approved applicator, the approved applicator scheme for Arbo sealants.
Can you do several jobs on one visit?
Yes. Tell us about everything you’d like done and we’ll quote it together.
Is it messy?
No. The area is protected while we work and cleaned up afterwards.
Keeping the joints in good condition
After the cure time, these simple habits help:
- Keep jet washers away from the mastic
- Wash the frames with mild soapy water
- Keep drainage slots and sill grooves clear
- Avoid harsh chemicals near the mastic
Silicone cannot usually be painted, so mention any painting plans before any work starts. There are paintable sealants for joints that need it.
Leaks usually 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.
Leave it or put it right?
Getting a straight, even bead on an outside frame takes practice, especially on upper floors. We cut out properly, back deep gaps and tool every joint neatly, using a product chosen for the frame and wall. Around Lee Common, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
What you pay reflects the work, not a rough estimate. That’s why we ask a few questions first.
What you get with us
- Arbo and Everbuild products
- Homes, businesses and hotels
- Fully insured
- Every job guaranteed for a year
Lee Common homes and the weather
With historic houses such as Cholesbury Manor House (about 2.3 miles north-east) nearby, there’s older building stock in the area around Lee Common as well as newer homes. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that’s traditional sand mastic. Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Rented homes near Great Missenden station change hands often, and cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets. For site and facilities teams at buildings such as Lee Common Church of England School, the mastic around its windows and doors needs looking after like any other building’s.
Lee Common is about 3 miles west of Chesham, in Buckinghamshire. Lee Common gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. Lee Common is one of 263 towns and villages in Buckinghamshire we cover for window mastic. Our Reading page covers work nearby, about 23 miles away.
Jobs for window mastic in HP16 works the same way as everywhere else we cover. You’ll find streets such as Oxford Street, Prince's Lane and Cherry Tree Lane, all of which we cover. We also cover the places around Lee Common: Ballinger Common (1 mile south-east), Swan Bottom (1 mile north-west), South Heath (1 mile south), Chartridge (2 miles east) and St Leonards (2 miles north). Within a short drive, we also cover Aylesbury (8 miles north-west), High Wycombe (7 miles south), Chesham (3 miles east), Marlow (11 miles south), Amersham (5 miles south-east) and Beaconsfield (8 miles south).
Local landmarks in Lee Common
We work in homes and buildings around Misbourne School and The Bugle pub and the streets around them. The nearest railway station is Great Missenden station, about 2 miles south-west of the centre. Other landmarks nearby include Chiltern Hospital (2.7 miles south) and Roald Dahl Museum and Story Centre (2 miles south-west). For a walk, there’s Sands Bank and Pavis Wood.
Do you need window mastic in Lee Common?
Sills take more water than any other part of a window, and the ends of the sill, where it meets the wall, are where it gets in. When that sealant fails, water gets into the wall or under the frame.
People generally contact us when they notice something like this:
- Cold air getting in at the frame edge
- Mastic that has split away from the wall
- Rain getting in at the frame or under the sill
- Draughty joints inside around the window
If you live in an older home near St Mary's, the joint between an old wall and a newer frame is normally the first place rain gets in.
Questions to ask before booking
- What happens if they find a problem under the old sealant
- Which colour the sealant will be
- Are they insured?
- Who turns up on the day
Places near Lee Common
Also in Lee Common
Different surfaces, different methods
Window sills
Every drop off the glass ends up on the sill, so the joints at each end and underneath matter. They’re cut out and resealed with exterior sealant.
uPVC windows
The frame is cleaned with a product that won’t harm the plastic, then the new bead is laid against the frame and the wall.
What affects the cost of window mastic
The price is agreed before any work begins. It’s based on:
- The old material and how stubborn it is
- The amount of work
- Access and height
- When we can work, for business premises
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. The price is agreed before we begin.
Helping us quote
When you call or email, it’s useful to know:
- Where the job is, and your postcode
- Roughly how big the job is
- Pictures of the joints, sent by email
- The problem you’ve noticed
Call for a quick quote, or send an email if you’d rather. Tell us about the joints that need doing and we’ll talk you through the work and send you a clear quote.