Kent · England
New-build mastic & snagging in Cobham, Kent
Our applicators work in Cobham on plot mastic for developers and snagging failed sealant in new homes. Old sealant removed completely, joints prepared properly and every job guaranteed for a year.
- Messy sealant that spoils new finishes
- Kitchen sealant that has pulled off the wall
- Internal frame sealant that has split
What happens on the day
On the day, there’s very little for you to do. Point us to the joints and we will get on with it. The job generally takes a few hours in a single home from start to finish. For a village or hamlet like Cobham, the journey is planned in advance: 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 joint is checked for movement before work begins.
- Old sealant is cut out and the joints cleaned.
- Joints are dried and primed where the product calls for it.
- New sealant goes in, with baths filled first so they’re at their heaviest.
- We check every joint and leave you with the cure times.
Getting ready for the visit
- For indoor joints, keep the area dry beforehand if you can
- Mention any parking rules near the property
- Tell us about access, such as stairs, a lift or high-level joints
Get a quote
It all starts with a short chat. Describe the problem, the location and the size of the job. When it suits you, ring 0345 464 0079 or drop us an email.
Related advice
About our new build mastic in Cobham
Our new-build work comes in two parts: plot mastic for developers, and putting right failed sealant for people who’ve bought a new home. In both, preparation makes the difference since hurried prep is behind a lot of new-build failures. Typical jobs include joints pulling apart as timber shrinks and kitchen sealant that has pulled off the wall, across windows & doors, kitchens and bathrooms & en suites.
For a small place like Cobham, the journey and access are planned in advance, and once on site, the job is the same as anywhere.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we’ll sort it.
- Where
- Cobham (DA12)
- Wider area
- Kent
- Cover
- 12 months on all our work
- Quote
- A clear price before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
How to look after the new joints
After the cure time, these simple habits help:
- Record problems with dated pictures
- Avoid scourers and strong chemicals on sealant
- Don’t wait for the house to settle if water is getting through
- Avoid running a DIY bead over the old one
Leave the sealant for the cure time we give you before showering or bathing. Most silicones need around a day to cure enough for use.
Lifting sealant traps moisture and mould behind it. Resealing before mould gets in saves a harder job later.
Other services in Cobham
Common questions in Cobham
Is Cobham in your area for new build mastic?
Yes, Cobham is within the area we cover. We work across London and the South East. You can ring 0345 464 0079 or email us and tell us what needs doing, and we’ll give you a clear price.
Will you come out to Cobham?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Are you an approved applicator?
Yes. We hold ARBOMaster approved applicator status.
Will the old sealant be removed?
Yes. All of the old material is cut out and the joint cleaned before applying anything new.
I rent my home. Can I book you?
Yes, but check with your landlord or agent first. Many landlords are glad to have it sorted.
How long before the joint can be used?
Cure times vary by product. Before we leave, we will tell you the cure time.
How long does the job take?
It depends on the size of the job, but as a guide it takes a few hours in a single home. We will give you a better idea when we quote.
Should I go to my builder first?
Report it to the builder first while you are covered. Once that’s done, or if they won’t put it right, we will cut it out and reseal it.
Surface by surface
Skirting and floors
As timber and screed dry, skirting and floors shift. Caulk cracks; a flexible sealant moves with it in a colour to suit.
Kitchens
Worktop, upstand and sink joints in new kitchens often get a hurried bead. We remove it and reseal with a kitchen-suitable sealant.
DIY sealant or a professional job?
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
Landlords, agents and businesses in Cobham
From a single let to a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
In hotels, rooms out of use cost money, so the work can be planned room by room. We’ve worked in hotels as well as homes and businesses.
Leave it or put it right?
Water getting past a failed seal in a new build reaches walls and floors that are still settling. Resealing promptly protects the new finishes around it. Around Cobham, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
The cost depends on the size of the job, how hard the old material is to remove and how easy the joints are to reach. You will have a clear quote before any work starts, so you know where you stand.
Why choose Mr Mastic in Cobham
- A sealant colour to suit the surroundings
- We never seal over old sealant
- White, clear, grey or coloured to suit, where the product allows
- Approved under the ARBOMaster scheme
See how sealant jobs are priced and our reviews.
New homes and floors in Cobham
The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Around Cobham, as everywhere, new build mastic is only as good as the preparation behind it. If you’ve bought a new home near Sole Street station, the sealant around baths, showers and frames is worth checking in the first year or two.
Cobham is about 3 miles south of Gravesend, in Kent. We provide new build mastic to homes and businesses in Cobham, as part of our work across Kent. Cobham is one of 922 places in Kent where we work for new build mastic. Our London page covers work nearby.
Our applicators cover all of the DA12 postcode area for new build mastic and the streets around it. We cover properties on The Street, Lawrence Drive and Cobhambury Road and the roads around them. We also cover the places around Cobham: Upper Bush (2 miles south-east), Lower Bush (2 miles south-east), Cuxton (2 miles south-east), North Halling (3 miles south-east) and Upper Halling (3 miles south). Within a short drive, we also cover Maidstone (10 miles south-east), Sittingbourne (15 miles east), Dartford (8 miles north-west), Sevenoaks (12 miles south-west), Gravesend (3 miles north) and Tonbridge (14 miles south).
Landmarks near Cobham
Around Cobham, our work takes us to homes and buildings near Thamesview School, The Ship Inn and Jeskyns. For rail, the closest station is Sole Street station, about 1.2 miles south-west of the centre. Nearby you will also find Rochester Castle (4.3 miles east) and Gravesham Community Hospital (3.9 miles north-west). The countryside around Cobham includes Gad's Hill and Ranscombe Farm.
When something else is needed
We’d rather tell you now than do work that will not last, so here’s what sealant cannot put right:
- Structural cracks in walls or ceilings
- Broken tiles or a split tray
- Leaks from pipes, valves or wastes, which need a plumber
If in doubt, phone 0345 464 0079 or drop us an email and we’ll say what we think.
What we seal
- Kitchens
- Skirting & floors
- Show homes
- Windows & doors
- Bathrooms & en suites
- Plot handovers