East Sussex · England
New Build Mastic in Gun Hill
Plot mastic for developers and snagging failed sealant in new homes in Gun Hill, with a 12-month guarantee on every job. Call for a quick quote.
- Cracks appearing as a new home settles
- New-build shower sealant that has already split
- Gaps behind new kitchen upstands
Gun Hill questions
What guarantee comes with new build mastic in Gun Hill?
All our work, in Gun Hill and everywhere else, comes with a 12-month guarantee. We’re also fully insured and ARBOMaster approved.
Can you do new build mastic in Gun Hill?
Yes, Gun Hill is within the area we cover. We work across London and the South East. You can ring 0345 464 0079 or send us an email and tell us what needs doing, and we’ll give you a clear quote.
Can landlords and businesses book you?
Yes, regularly. Several properties can be quoted together, and between tenancies is a good time for the work.
Can you do several jobs on one visit?
Yes. Tell us about everything you’d like done.
Will there be a smell?
Some sealants have a smell while they cure, which fades as it sets. Opening a window helps.
Can you match the sealant colour to my new kitchen or bathroom?
White and clear are the most common, but sealant comes in other colours too. We choose one to suit the room and agree it with you.
Where is Mr Mastic based?
Mr Mastic is based in Crawley. We cover Gun Hill and the rest of East Sussex.
Can new sealant go on top of the old bead?
No. The old sealant is cut out fully, the joint cleaned and primed where needed, before resealing.
New build mastic for homes and businesses in Gun Hill
Building dust is behind a lot of failed new-build sealant. Each joint is cleaned of dust and primed where the product calls for it, so the new bead bonds properly instead of bonding to the dust. We work on show homes, kitchens and plot handovers, and common reasons people get in touch are messy sealant that spoils new finishes and cracked sealant around new window and door frames.
Somewhere as small as Gun Hill, new homes tend to be conversions, self-builds or a few houses rather than an estate. Each still needs its sealant and floor joints finished properly.
The work is guaranteed for twelve months. If something is not right with it in that time, tell us and we’ll put it right.
- Location
- Gun Hill (TN21)
- Region
- East Sussex
- Cover
- 12 months on all our work
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
What sealant work cannot fix
We will not take on work that won’t last, so these are the limits:
- Movement caused by a poorly fitted tray or bath
- Damaged fittings that need replacing
- Structural cracks in walls or ceilings
If in doubt, ring 0345 464 0079 or email us and we will say what we think.
What we seal
- Plot handovers
- Skirting & floors
- Show homes
- Windows & doors
- Kitchens
- Bathrooms & en suites
New homes and floors in Gun Hill
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.
For jobs in and around Gun Hill, choosing the right material for each joint is as important as a tidy finish. In and around Gun Hill, as anywhere, good new build mastic starts with a clean, dry, properly prepared joint.
Gun Hill is about 3 miles north-west of Hailsham, in East Sussex. Anywhere in TN21, we can carry out new build mastic at your property. Gun Hill is one of 289 towns and villages in East Sussex where we work. We also work in Brighton, around 16 miles away.
Every address in TN21 is within our area for new build mastic. We also cover Hale Green (1 mile west), Muddles Green (1 mile south-west), Burlow (1 mile north-east), Horam (2 miles north-east) and Lions Green (2 miles north). Within a short drive, we also cover Eastbourne (9 miles south), Hastings (15 miles east), Bexhill-on-Sea (11 miles east), Seaford (10 miles south-west), Lewes (10 miles west) and Hailsham (3 miles south-east).
Around Gun Hill
A little further out are Hellingly Hospital Railway (2.1 miles south-east) and Sussex Farm Museum (1.9 miles north-east). The countryside around Gun Hill includes Selwyns Wood.
What we do, step by step
There isn’t much for you to do on the day. Point us to the joints and we’ll get on with it. The job generally takes a few hours for most snagging lists, longer for a run of plots, including the tidy-up. For a village or hamlet like Gun Hill, 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 start by going through the snagging items or plot schedule with you.
- Every bit of the old builder’s sealant is cut out.
- We clean out the dust and grit left from the build.
- We prime where needed and apply a sealant suited to each joint.
- Each bead is tooled and the cure times explained.
How to prepare
- Mention any sign-in or site rules at work premises
- Move anything stored near the joints
- For indoor joints, keep the area dry beforehand if you can
Get a quote
We do not publish a price list, because every job is different. Instead, we give you a clear price for your job. To arrange one, ring 0345 464 0079 or send us an email.
Read more
What affects the quote in Gun Hill
Some jobs are bigger than they look, and some smaller. What affects the quote:
- Working hours on commercial sites
- How many rooms, windows or areas are involved
- Mould in or behind the old joints
- How much old sealant there is and how hard it is to remove
What it costs depends on the size of the job, how hard the old material is to remove and access to the work. You’ll have a clear quote before any work starts, so you know where you stand.
Helping us quote
What to tell us when you ask for a quote:
- Roughly how big the job is
- The type of property
- Access, such as stairs, a lift or height
- The address or postcode of the job
We quote each job on its own, so start by telling us what you need. Simply phone 0345 464 0079 or send us an email and describe the job and send photos if you have them.
DIY versus a professional finish
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it doesn’t work out, we can still put it right.
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
Why act early in Gun Hill
DIY kits don’t solve the main problems with new-build sealant: dust, no primer and old sealant left in the joint. Proper removal and preparation are what make it last. Around Gun Hill, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Combining jobs into one visit is normally more efficient than separate visits, so tell us about everything that needs sealing. You will get one clear quote for the whole job.
Why choose Mr Mastic in Gun Hill
- Fully insured
- 180+ five-star Google reviews
- A choice of colours where the product allows
- Sanitary silicone with an anti-fungal additive in wet areas
Read what affects the cost or customer reviews.
Towns and villages near Gun Hill
Also in Gun Hill
How the job changes by surface
Show homes
Show homes need sealant that looks right from day one. Every bead is neat and coloured to suit the room.
Skirting and floors
Gaps under skirting are one of the most common new-build snags. We seal it with a flexible sealant that copes with the movement.
Aftercare tips
To keep the joints looking good and working properly:
- Wait for the cure time before using a resealed shower
- Wipe joints with warm soapy water
- Photograph failed sealant before it’s redone
- Look at the sealant regularly in the first couple of years
Avoid standing on the rim of the bath or the edge of the tray. Report any movement in a bath or tray.
Don’t let the snagging period run out with sealant problems unreported. After that, putting it right may fall to you so report it promptly.