Hertfordshire · England
Window & door mastic in Bromley, Hertfordshire
Mastic around window and door frames, sills and patio doors for homeowners, landlords and businesses in Bromley. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Gaps between the frame and the inside reveal
- Cracked or shrunken mastic around the frame
- Untidy mastic left by window fitters
Window mastic for homes and businesses in Bromley
The mastic around a window or door seals the gap between the frame and the wall. When it cracks, hardens or pulls away, draughts and rain get in. Our applicators cut it out and replace it with a flexible, weatherproof sealant. If you have untidy mastic left by window fitters and leaking joints at the ends of sills, we can help, on window sills, composite doors and uPVC windows alike.
In a village or hamlet like Bromley, older cottages and farmhouses often have timber windows set in stone or brick. Older buildings like these don’t always suit modern silicone, so the sealant has to be chosen to suit the building.
Our work is backed for twelve months, in Bromley and everywhere else we cover.
- Place
- Bromley (SG11)
- Wider area
- Hertfordshire
- Guarantee
- 12 months on all our work
- Quote
- A clear price before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
DIY sealant or a professional job?
If you’re set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it does not work out, we can still put it right.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and doesn’t move well, and getting the depth right matters as much as the look.
How it works
Before we leave, we go over the finished joints with you and explain the cure time. The work normally takes a few hours for a few frames, or a day or more for a whole house, depending on the size of the job. Somewhere as small as Bromley, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- We check each frame and agree which ones need doing.
- We remove the old mastic and clean the frame and the wall.
- Deep gaps are filled with backing rod to set the depth.
- We apply a weatherproof sealant to match the frame and tool it neatly.
- Every joint is checked before we leave.
Getting ready for the visit
- Tell us about access, such as stairs, a lift or high-level joints
- Tell us about any water getting in
- Tell us if parking is tricky
Getting a quote
It all starts with a short chat. Describe the problem, the location and the size of the job, and we’ll explain how we’d tackle it. When it suits you, phone 0345 464 0079 or drop us an email.
Related advice
FAQs for Bromley
I let a flat near Bishops Stortford station. Can you help?
Yes, we work for landlords and agents. You can ring 0345 464 0079 or email us with the address and a few details, and we will give you a fixed price before any work starts.
Is Bromley in your area for window mastic?
Yes, Bromley is within the area we cover. We work across London and the South East. Just ring 0345 464 0079 or drop us an email with a few details of the job.
Will resealing my frames help with draughts?
Yes, where the draught is at the frame edge. We find where the air is coming from before we reseal.
Do you work on first-floor windows?
Yes, where it’s safe. Higher or awkward frames may need extra access, and we will confirm what’s needed.
Will it make a mess?
Tidy work is part of the job. Nearby surfaces are protected, and we clear up when we are done.
Can I paint over the new sealant?
Silicone generally won’t take paint. Let us know beforehand, and we’ll use a paintable product where it suits.
Do you hold any approvals?
Yes. We are approved under the ARBOMaster scheme, the approved applicator scheme for Arbo sealants.
Does the work come with a guarantee?
Yes, with our one-year guarantee. A yearly look at the joints helps them last.
What the job involves on each surface
Timber windows & doors
Older timber windows in stone or brick can suit sand mastic rather than modern sealant. We can talk through the options.
Composite doors
An exposed front door gets wind-driven rain, and the top and bottom corners tend to fail first. We pay most attention there.
Bromley homes and the weather
With historic houses such as Much Hadham Palace (about 1.4 miles south-east) nearby, there’s older building stock in the area around Bromley as well as newer homes. In older buildings, 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, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Historic houses such as Much Hadham Palace, about 1.4 miles south-east, show how far back building around Bromley goes.
Bromley is about 4 miles west of Bishop's Stortford, in Hertfordshire. Whether you’re in the middle of Bromley or further out, we cover window mastic for every kind of property. 381 places in Hertfordshire are on our list. We also work in Chelmsford, about 21 miles from Bromley.
Postcode districts we cover here for window mastic: SG11. Close by, we work in Standon (1 mile north-west), Hadham Ford (1 mile east), Much Hadham (1 mile south-east), Puckeridge (2 miles north-west) and Hadham Cross (2 miles south). Further out, we also cover Stevenage (10 miles west), Bishop's Stortford (4 miles east), Welwyn Garden City (12 miles south-west), Hitchin (15 miles west), Hoddesdon (9 miles south) and Cheshunt (12 miles south).
Around Bromley
We work in homes and buildings around The Fox And Hounds pub and the streets around them. Bromley’s nearest station is Bishops Stortford station, roughly 4.8 miles east. Well-known places in the area include Henry Moore Studios and Gardens (2.8 miles south-east) and Moated mound (2.7 miles north-east).
When to call us in Bromley
Mastic ages in the weather. UV light hardens the outside of the bead, and over the years it loses its give, cracks and comes away.
Most people get in touch after spotting one of these:
- Damp patches on the reveal after heavy rain
- Hard, cracked sealant around windows
- Gaps between the frame and the inside reveal
- Black, perished sealant on frames
If you let a flat or house near Bishops Stortford station, renewing tired window mastic between tenants heads off draught and damp complaints.
What your quote should include
- Whether you can choose the colour
- What happens if they find a problem under the old sealant
- Which sealant they’ll use, and why
- Who does the work, and how experienced they are
What happens if it’s left?
A quick bead over the top of old mastic looks like an easy fix, but it will not grip old, dirty sealant. It soon lifts and the leak carries on behind it. The old mastic has to come out. Older cottages and farmhouses around Bromley can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
Every job is a little different, so we quote each one individually. Size, access and the product the joint needs all make a difference.
Why us?
- ARBOMaster approved applicator
- Arbo and Everbuild products
- More than 20 years in sealant work
- Full insurance on every job
See our cost guide or our reviews.
Nearby places to Bromley
What else we do in Bromley
What affects the quote in Bromley
Jobs vary more than people expect. The main factors:
- The type of sealant required
- How much old sealant there is and how hard it is to remove
- The size of the job
- How many rooms, windows or areas are involved
There are no prices on our website, because each job is priced on what it involves. For a quick quote, please phone 0345 464 0079 or email us.
Helping us quote
The more you tell us, the more accurate the quote. When you ask for a quote, tell us:
- What’s wrong with the joints now
- The rough size of the job
- How we’d reach the joints
- The address or postcode of the job
To get a quote, call 0345 464 0079 or email us with the location and a short description of the problem. You will have a clear quote before we start.
How to look after the new joints
Good habits help new joints last longer. A few tips:
- Make sure the drainage slots aren’t blocked
- Walk round the house once a year and look at the joints
- Ventilate rooms so frames do not stay wet inside
- Avoid harsh chemicals near the mastic
Keep sill grooves and drainage slots clear, so rain drains out rather than building up at the sealant.
Water gets in quietly when mastic fails. Often the first sign is a damp patch inside or flaking paint on the reveal. Catching it early keeps the fix to a reseal.