Kent · England
New Build Mastic in Seal
New-build sealant joints in Seal need attention? We remove the old material, prepare the joints and seal them properly, with a one-year guarantee.
- Skirting joints opening in the first winter
- Frame joints opening as the plaster dries
- Kitchen sealant that has pulled off the wall
Leave it or put it right?
If you are still in the builder’s snagging or warranty period, ask them to put it right first. If it’s slow, or the same joint keeps failing, a proper reseal from a specialist is the next step. Where a wall is exposed, as many are in small places like Seal, wind-driven rain gets into any failed joint, and damp in older walls is slow to dry out.
The cost depends on how much there is to do, how much old material has to come out and access to the work. We give a clear quote before we start, so you know where you stand.
Why choose Mr Mastic in Seal
- Colour agreed with you before any work starts
- More than 20 years in sealant work
- A 12-month guarantee on all work
- We never seal over old sealant
Read how sealant jobs are priced and our reviews.
New build mastic in Seal
If your new home has a leaking shower seal, open skirting joints or untidy sealant, we can help. While the builder’s snagging or warranty period runs, report it to them first. If you’re dealing with gaps between new skirting and floors and beads laid onto grit and dust from the build, we can help.
Around Seal, older homes often have timber floors that move through the year, which is why skirting and threshold joints need a flexible sealant, not filler.
You are covered for a year from the day we finish. If there’s a problem with it, please ring 0345 464 0079 or send us an email.
- Place
- Seal (TN15)
- Wider area
- Kent
- Guarantee
- One year on every job
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
What affects the quote in Seal
The quote reflects the job in front of us. We take into account:
- How many rooms, windows or areas are involved
- Whether old sealant or filler has to be cut out
- How easy the joints are to reach
- When we can work, for business premises
The cost reflects the work involved, not a rough estimate. That is why we ask about the job first and agree the price before starting.
Helping us quote
There’s no need for technical detail. Just tell us:
- Where the property is
- How many joints, rooms or windows are involved
- Any access issues, like height or stairs
- A few photos by email, if you can
For a quick quote, get us on the phone, or send an email if you’d rather. Tell us about the joints that need doing and we will talk you through the work and give you a clear price.
When it isn’t the sealant
A few problems are outside what sealant work can do:
- Disputes or warranty claims with your builder
- Leaks from pipes, valves or wastes, which need a plumber
- Settlement cracks that need a surveyor
Not sure which it is? You can ring 0345 464 0079 or email us and we’ll tell you honestly before you book.
Joints and surfaces we work on
- Skirting & floors
- Kitchens
- Show homes
- Windows & doors
- Bathrooms & en suites
- Plot handovers
Different surfaces, different methods
Windows and doors
Internal joints between frames and plaster often crack as a new house dries. We cut out the cracked bead and reseal with a flexible sealant.
Plot handovers
Good preparation at handover saves snagging later. Dust from the build is removed first and prime where the product needs it.
Aftercare tips
To keep the joints looking good and working properly:
- Check bath and shower seals every few months as the house settles
- Use the extractor fan every time you shower
- Avoid scourers and strong chemicals on sealant
- Record problems with dated photos
Follow the cure time we give you before the area gets wet. Most silicones need around a day before water reaches them.
Report failed sealant to the builder while you’re in the snagging period. After that, putting it right may fall to you.
How it works
There’s no need to move everything out before we come, only the area right around the joints. We protect the rest, and the work takes a few hours in a single home in most cases. For a village or hamlet like Seal, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- We go through the snagging list or plot schedule and agree the joints to do.
- Failed or untidy sealant is cut out completely.
- We clean off dust from the build and prime the surfaces where the product needs it.
- New sealant suited to each joint is applied and tooled neatly.
- Each area is checked and left with its cure time.
How to prepare
- Plan for the work area to be out of bounds to pets and children
- Tell us about access, such as stairs, a lift or high-level joints
- Clear items away from the joints we’re working on
Getting a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we will talk you through what we’d do. Whenever you’re ready, phone 0345 464 0079 or email us.
Related advice
Joints and finishes in Seal homes
Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
In and around Seal, as anywhere, good new build mastic starts with a clean, dry, properly prepared joint. For new homes near Bat & Ball station, it’s worth checking the sealant early, while snags are still fresh.
Seal is about 2 miles north-east of Sevenoaks, in Kent. Whether you’re in the middle of Seal or further out, we cover new build mastic for every kind of property, from flats and houses to offices and hotels. Seal is one of 922 places in Kent where we work. Our London page covers work nearby.
Every address in TN15 is covered for new build mastic, from the main roads to the quietest streets. New build mastic is available to properties on High Street, Church Road and Jubilee Rise. Neighbouring places we cover for new build mastic include Greatness (1 mile west), Godden Green (1 mile south), Styants Bottom (2 miles east), Stone Street (2 miles south-east) and Bitchet Green (2 miles south-east). Larger places within reach include Maidstone (13 miles east), Dartford (11 miles north), Royal Tunbridge Wells (11 miles south), Gravesend (12 miles north-east), Tonbridge (7 miles south) and Northfleet (11 miles north-east).
What’s near Seal
We work in homes and buildings around Wildernesse School, Kemsing Down and The Five Bells Public House and the streets around them. The closest station to Seal is Bat & Ball station, roughly 1.1 miles west. A little further out are Sevenoaks Hospital (1.1 miles west) and Sevenoaks Museum (1.7 miles south-west). Green spaces nearby include Dryhill Nature Reserve.
Seal: your questions answered
Is Seal in your area for new build mastic?
Yes, Seal is within the area we cover. We work across London and the South East. Just ring 0345 464 0079 or email us with a few details of the job, and we’ll give you a clear price.
Do you work for landlords with property near Bat & Ball station?
Yes, landlords and agents are among the people we work for, and several properties can go on one quote. Just call 0345 464 0079 or email us with the address and what needs doing, and we’ll give you a clear quote.
How long before the joint can be used?
That depends on the sealant used, so follow the cure time we give you when we finish.
Where is Mr Mastic based?
Mr Mastic is based in Crawley. Our applicators cover Seal.
Should I wait before resealing?
That depends on the joint. A leaking shower or bath seal should be redone right away, while small cosmetic gaps can wait a while.
Do you hold any approvals?
Yes. We’re approved under the ARBOMaster scheme, the approved applicator scheme for Arbo sealants.
Will the old sealant be removed?
Always. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.
Will there be a smell?
That depends on the sealant. Some smell for a while, some hardly at all.
More services for Seal
Should I try it myself first?
A DIY attempt doesn’t rule out a professional job. We cut it out and start again, so tell us about it when you ask for a quote.
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.