Kent · England
Window & door mastic in Comp, Kent
Problem with your window and door frames in Comp? We remove the old material, prepare the joints and seal them properly.
- Mastic that is falling out in pieces
- Damp patches on the reveal after heavy rain
- Gaps between the frame and the inside reveal
Landlord and commercial work in Comp
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we will give you a quote.
About our window mastic in Comp
Over two decades of sealing frames has taught us which products suit which walls. We are fully insured ARBOMaster approved applicators, and every job is covered by a 12-month guarantee. We work on patio & French doors, timber windows & doors and window sills, and common reasons people get in touch are rushed sealant from a window installation and cold air getting in at the frame edge.
Around Comp, many homes face open ground, so their windows and doors take the full weather. That exposure dries out and cracks the mastic around frames and sills faster.
Each job carries a 12-month guarantee, large or small.
- Place
- Comp (TN15)
- Region
- Kent
- Guarantee
- One year on every job
- Quote
- A clear price before work begins
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
What happens on the day
Our applicators work methodically: protect, prepare, seal, tidy. Typically it takes anything from an hour or two to a full day, depending on how many frames there are. Somewhere like Comp needs a little journey planning: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- We check each frame and agree which ones need doing.
- Next the failed sealant is cut away and the joint cleaned.
- Where gaps are deep, backing rod goes in first.
- A flexible, weatherproof sealant is applied in a colour to suit the frame.
- Every joint is checked before we leave.
How to prepare
- Mention any sign-in or site rules at work premises
- Mention any tricky access
- Clear items away from the joints we are working on
Ask for a quote
Call for a quick quote, or email us if that’s easier. Tell us about the joints that need doing and we’ll talk you through the work.
Related advice
How to look after the new joints
Good habits help new joints last longer. Our tips:
- Paint up to the joint, not over it
- Look round the frames every year or so
- Air rooms to keep condensation down around windows
- Keep paint and stain on wooden frames in good order
Check the drainage slots in the frames aren’t blocked, so water can run away instead of sitting against the joint.
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.
Can I do it myself?
If you do try it yourself, take your time over the 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.
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
What affects the quote in Comp
You’ll get a clear quote before any work starts. It takes into account:
- How easy the joints are to reach
- Any mould that needs treating
- Any working-time requirements on site
- The size of the job
A failed joint rarely gets cheaper to fix by waiting, because water and mould keep working on it. If you’re unsure, ring 0345 464 0079 or drop us an email for an honest opinion and a quote.
What to tell us for a quote
When you call or email, it’s useful to know:
- The problem you’ve noticed
- If it’s domestic, commercial or a hotel
- Access, such as stairs, a lift or height
- The rough size of the job
Every job is quoted individually. Simply ring 0345 464 0079 or send us an email and describe the job.
Comp questions
Is Comp within the area you cover?
Yes. Comp is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Do you work for landlords with property near Borough Green & Wrotham station?
Yes. We work for landlords and agents as well as householders. You can phone 0345 464 0079 or email us with the details for a clear quote.
How many windows can you do in a day?
That depends on the number of frames, how they’re reached and the state of the old mastic. We will tell you how long your job needs when we quote.
Do you guarantee window mastic?
Yes. Every job comes with our one-year guarantee, and we are fully insured.
Will resealing my frames help with draughts?
Yes, where the draught is at the frame edge. We check where the draught is before work begins.
What sealant do you use?
We choose the sealant for the joint, not the other way round. Movement, water and weather all affect the choice, and we’ll tell you what we are using.
Is there any odour?
Possibly a little. Any smell clears as the sealant cures.
When is the sealant fully cured?
Many sealants skin over quickly but take longer to cure fully. We’ll tell you how long to leave the joint before we leave.
When to call us in Comp
Some failures date back to when the windows were fitted. Sealant run over dust, wet brick or loose mortar didn’t grip properly, so it comes away long before its time.
These are the problems we are asked about most:
- Old mastic that has gone black or come away
- Sealant in the wrong colour for the frame
- Gaps between the frame and the inside reveal
- Water coming in at the bottom corners of a door
Managing a site like Platt Church of England Voluntary Aided Primary School? Then its window and door frames need their mastic kept sound, just like a home’s.
Comparing quotes
- How hidden problems are handled
- How long the guarantee is
- Whether VAT is included
- When the joint can take water or movement
Windows and doors in Comp
Historic houses like Old Soar Manor (about 1.7 miles south-west) are a reminder that the area around Comp has older buildings as well as new. 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. Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Letting a property close to Borough Green & Wrotham station? Then cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets. For an older house near a landmark such as Church of St Mary, frames set in older brick or stone need a sealant that suits the wall as well as the frame.
Comp is about 3 miles west of Kings Hill, in Kent. For window mastic in and around Comp, it’s easy to get a quote: please call 0345 464 0079 or send us an email. We cover Kent from our Crawley base. Our area takes in 922 places across Kent, large and small. There’s also a page for London, roughly 24 miles from Comp.
Our applicators cover all of the TN15 postcode area for window mastic and the streets around it. We also cover Platt (1 mile north-west), Wrotham Heath (1 mile north-east), Crouch (1 mile south-west), Claygate Cross (1 mile south-west) and Borough Green (1 mile west). Further out, we also cover Maidstone (8 miles east), Dartford (12 miles north-west), Sevenoaks (7 miles west), Royal Tunbridge Wells (11 miles south), Gravesend (10 miles north) and Tonbridge (7 miles south-west).
Landmarks near Comp
We work in homes and buildings around The Blue Anchor pub and Wrotham School, among other places. Comp’s nearest station is Borough Green & Wrotham station, roughly 1.5 miles west. Nearby you will also find Ightham Court (2.3 miles west) and Beechin Wood Archery Museum (within half a mile west).
Surface by surface
Timber windows & doors
On period timber windows, traditional sand mastic is sometimes the better choice. We will tell you which suits your home.
Window sills
Sills catch the water running down the glass, so the sill ends and the joint under the frame are vital. Each is cleaned out and resealed.