Surrey · England
Window & door mastic in Coldharbour, Surrey
Mastic around window and door frames, sills and patio doors in Coldharbour, with a one-year guarantee on every job. Call for a quick quote.
- Old mastic that has gone black or come away
- Hard, cracked sealant around windows
- A bead that doesn’t match the frame
Why it’s worth doing now in Coldharbour
If you’re painting or rendering, reseal at the same time. A clean new bead makes new paint or render look finished. In a small place like Coldharbour, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
A few things move the cost up or down: the old material and how easily it comes out, any mould to treat, and whether the work is at height. We take all of that into account in your quote.
Why choose Mr Mastic in Coldharbour
- Colour picked to suit the job
- Anti-fungal silicone where joints get wet
- Every job guaranteed for a year
- A choice of colours where the product allows
How we handle window mastic in Coldharbour
Around Coldharbour we seal all kinds of frames: from uPVC casements to timber and aluminium, along with patio doors, French doors and sills. Each gets a sealant chosen for the frame and the wall it meets. Typical jobs include cracked internal joints between frame and plaster and whistling draughts around closed windows, across composite doors, window sills and uPVC windows.
Outdoor sealant needs dry, clean surfaces, so work on frames around Coldharbour is planned for dry weather. Tell us about access to every side of the house, including upper-floor windows.
You’re covered for a year from the day we finish. If anything is not right with it, phone 0345 464 0079 or email us.
- Location
- Coldharbour (RH5)
- Region
- Surrey
- Guarantee
- A year, on every job
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
How to look after the new joints
Good habits help new joints last longer. Our tips:
- Clean frames with a soft cloth and soapy water
- Keep paint and stain on wooden frames in good order
- Keep solvents and bleach off the sealant
- Air rooms to keep condensation down around windows
Silicone can’t usually be painted, so mention any painting plans before work begins. We can use a paintable sealant where that matters.
Signs to watch for: cracks in the mastic, gaps you can see light through, damp on the reveal or mould around the inside of the frame. Any of these is worth a call.
DIY sealant or a professional job?
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly.
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
Coldharbour: your questions answered
Is Coldharbour within the area you cover?
Yes, we do. Our work covers London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Can you do window mastic in Coldharbour?
Yes, Coldharbour is within the area we cover. We work across London and the South East. You can phone 0345 464 0079 or email us and tell us what needs doing, and we’ll give you a clear quote.
Can you seal over the old sealant?
No, it won’t last. It can look neat for a few weeks, but the new layer lifts away from the old one. Removing the old sealant completely is the only lasting way.
Are you fully insured?
Yes. Mr Mastic is fully insured, and we’ve been doing sealant work for more than 20 years.
Can I add another job to the visit?
Yes. Tell us about everything you’d like done and we’ll quote it together.
Does someone need to be in?
For indoor joints, yes, someone needs to let us in. After that, you can carry on with your day.
Is the new sealant paintable?
Silicone generally won’t take paint. Let us know beforehand, and we will use a paintable product where it suits.
Can you match the sealant to my frames?
Yes. White, brown, anthracite grey, black and clear sealants are all available.
What the job involves on each surface
uPVC windows
We clean the frame edge carefully so the plastic isn’t marked, then the new bead is laid against the frame and the wall and tooled smooth.
Patio & French doors
Water at the foot of a door frame isn’t always the mastic: blocked drain slots, worn brush seals and threshold details can let water in too. We check before we reseal.
What happens on the day
Once we’re on site, we check the joints match what you told us. If anything is different, we explain it before carrying on. After that, the work takes a few hours for a few frames, or a day or more for a whole house. Somewhere like Coldharbour 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.
- Each frame is looked over and we agree which ones need resealing.
- The old mastic is cut out and scraped back to clean surfaces.
- Where the gap is deep, backing rod goes in first.
- The new sealant goes on in white, brown, anthracite grey, black or clear to suit.
- Every joint is tooled smooth and checked before we leave.
How to prepare
- For business premises, tell us about site rules or sign-in
- Where the joints are inside, avoid wetting them before we arrive
- Keep children and pets away from the work area
Ask for a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job. Whenever you’re ready, ring 0345 464 0079 or email us.
Read more
Frames and glazing around Coldharbour
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.
Rented homes near Holmwood station change hands often, and renewing tired window mastic between tenants heads off draught and damp complaints. For an older house near a landmark such as Christ Church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
Coldharbour is about 4 miles south of Dorking, in Surrey. Across the RH5 area, we can carry out window mastic at your property. Across Surrey, we cover 395 places, and Coldharbour is one of them. Crawley is on our list too, about 9 miles from Coldharbour.
We cover every part of RH5 for window mastic. If you are just outside Coldharbour, we cover Abinger Bottom (2 miles north-west), South Holmwood (2 miles north-east), Holmwood Corner (2 miles east), Friday Street (2 miles north-west) and Beare Green (2 miles east). Larger places within reach include Guildford (10 miles north-west), Woking (13 miles north-west), Epsom (11 miles north), Horley (8 miles east), Redhill (9 miles north-east) and Ewell (13 miles north).
Landmarks near Coldharbour
Locally, jobs take us to homes and businesses close to Wotton and Abinger Commons and Plough Inn and the streets around them. The nearest railway station is Holmwood station, about 1.6 miles east. Nearby you will also find Mesolithic Museum (2.6 miles north-west) and Abinger Castle (2.6 miles north-west). Open spaces near Coldharbour include Vann Lake and Leith Hill.
Also near Coldharbour
What else we do in Coldharbour
When it isn’t the sealant
New sealant can’t fix everything, and we’ll tell you before work begins. Sealant will not put right:
- A failed sealed unit that has misted up
- A frame that has rotted at the joint
- A sash or casement that won’t close properly
If in doubt, phone 0345 464 0079 or email us and we’ll say what we think.
Where we work in Coldharbour
- Window sills
- uPVC windows
- Composite doors
- Timber windows & doors
- Aluminium frames
- Patio & French doors
How we quote for window mastic
We do not publish a price list. What we look at:
- The old material and how stubborn it is
- How easy the joints are to reach
- Which sealant suits the joint
- Any working-time requirements on site
What it costs depends on the size of the job, how much old material has to come out and how easy the joints are to reach. We give a clear quote before work begins.
What to tell us for a quote
Photos help, but a description is a good start. Try to tell us:
- The type of property
- Any previous sealing or DIY work
- How we’d reach the joints
- Where the job is, and your postcode
Asking for a quote is easy: let us know what needs doing and where and its rough size. A few photos by email make the job easier to understand, and we’ll take it from there.