Buckinghamshire · England
New Build Mastic in Amersham
New-build sealant joints in Amersham need attention? We cut out the old, prepare the joints and apply the right sealant.
- Leaking shower tray seals in a new home
- Gaps behind new kitchen upstands
- Skirting joints opening in the first winter
About our new build mastic in Amersham
Snagging sealant properly means taking the failed bead out completely. Fresh silicone cannot bond to the old layer, so the joint is cut out, cleaned, dried and resealed. We are often asked to deal with gaps opening as the house dries out and settles and beads laid onto grit and dust from the build, on skirting & floors, bathrooms & en suites and show homes.
In a town like Amersham, older houses sit alongside newer estates, with new homes still going up on the edge of many towns. Whether a house is brand new or a few years old, sealant and floor joints are often the first snags to show.
You are covered for a year from the day we finish. If there’s a problem with it, please call 0345 464 0079 or email us.
- Place
- Amersham (HP6, HP7)
- Wider area
- Buckinghamshire
- Cover
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
New homes and floors in Amersham
London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
If you’ve bought a new home near Amersham station, the sealant around baths, showers and frames is worth checking in the first year or two.
Amersham is about 7 miles north-east of High Wycombe, in Buckinghamshire. If you need new build mastic in Amersham, please ring 0345 464 0079 or drop us an email for a quick quote. We cover Buckinghamshire from our Crawley base, Amersham included. Our Buckinghamshire coverage runs to 263 places, and Amersham is one of them. For nearby work, see our Reading page (23 miles or so).
Postcode districts we cover here for new build mastic: HP6 and HP7. You’ll find streets such as Station Road, London Road West and Market Square, all of which we cover. Being close to the A355 and A404, Amersham is easy for our applicators to reach for new build mastic. If you’re just outside Amersham, we cover Amersham on the Hill (1 mile west), Chesham Bois (1 mile north), Waterside (1 mile north), Coleshill (2 miles south-west) and Hyde Heath (2 miles north-west). Further out, we also cover Aylesbury (13 miles north-west), High Wycombe (7 miles south-west), Chesham (3 miles north), Marlow (10 miles south-west), Beaconsfield (5 miles south-west) and Chalfont St Peter (5 miles south). Being one of Buckinghamshire’s larger places, Amersham has every kind of property, from flats to offices.
What’s near Amersham
Locally, jobs take us to homes and businesses close to The Pheasant Public House, Woodside Junior School and Dr Challoner's Grammar School. Amersham has its own railway station: Amersham station. Well-known places in the area include Amersham Hospital (1.2 miles south-west) and Amersham Fair Organ Museum (less than half a mile north-east). Green spaces nearby include Sands Bank.
Common problems we fix in Amersham
On many sites, sealant goes on in the final rush before handover. Joints are not always cleaned of dust or primed, and the sealant sits on grit instead of the surface.
It’s worth asking for a quote if you see:
- Skirting joints opening in the first winter
- Shower seals failing in the first year or two
- Smeared, uneven beads picked up at snagging
- Joints pulling apart as timber shrinks
In and around Amersham, as anywhere, good new build mastic starts with a clean, dry, properly prepared joint.
What your quote should include
- The length of the guarantee
- Whether they’re fully insured
- When the joint can take water or movement
- Is VAT in the price?
Surface by surface
Windows and doors
A draught at a new window can be a missed or failed joint. We look at the joints and reseal where needed.
Bathrooms and en suites
Shower trays in new homes often move slightly in the first year. The joint is stripped back before the new bead goes in with baths filled first.
When something else is needed
We’d rather tell you now than do work that won’t last, so these are the limits:
- Deciding who is responsible under a builder’s warranty
- Leaks from pipes, valves or wastes, which need a plumber
- Broken tiles or a split tray
If you are not sure, just ring 0345 464 0079 or email us and we’ll give you a straight answer before you book.
Joints and surfaces we work on
- Skirting & floors
- Show homes
- Kitchens
- Bathrooms & en suites
- Plot handovers
- Windows & doors
How the visit works
You don’t need to clear the whole room or building, just the space around the work. We protect the rest, and the job takes a few hours for most snagging lists, longer for a run of plots for a typical job. A visit in Amersham needs access to the work and a place to park close by. For outside work, let us know about side access, gates and any upper-floor joints.
- First we work through your snagging list or plot schedule with you.
- Failed or untidy sealant is cut out completely.
- Surfaces are cleaned of building dust and primed where needed.
- We apply a sealant that suits each joint and tool it to a neat finish.
- Finally, each room is checked and you’re given the cure time.
Preparing for the visit
- Let us know if you’ve seen damp or leaks
- Keep children and pets away from the work area
- Tell us about any previous sealing or DIY attempts
Ask for a quote
If you are in Amersham and need new build mastic, ring 0345 464 0079 or drop us an email. A short description of the job and where it is helps us quote, and we’ll agree the price before any work begins.
Read more
Aftercare tips
Looking after new joints is easy, and it makes a real difference:
- Report sealant problems to your builder during the snagging period
- Watch for new gaps as the house dries out
- Open a window or run the fan after bathing
- Keep water off fresh sealant until it has cured
Wipe the sealant with warm soapy water. Keep scourers and harsh chemicals off it, which can damage the surface.
Lifting sealant traps moisture and mould behind it. Dealing with it before it goes black saves a harder job later.
What happens if it’s left?
Small cosmetic gaps can wait for the house to settle, but water getting through cannot. If you are unsure which you have, call 0345 464 0079 or drop us an email with pictures. In Amersham, as anywhere, most leaks start as a small gap in a joint, and they’re far easier to fix early.
The cost reflects the work involved, not guesswork. That’s why we ask a few questions first.
What you get with us
- Arbo and Everbuild products
- 180+ five-star Google reviews
- You choose the colour before work begins
- Sealant colour chosen to suit
Take a look at how sealant jobs are priced or customer reviews.
Common questions in Amersham
Can you help a landlord with a rental near Amersham station?
Yes, rental work is part of what we do. You can call 0345 464 0079 or email us with the address and a few details, and we will give you a fixed price before we start.
What guarantee comes with new build mastic in Amersham?
All our work, in Amersham and everywhere else, comes with a 12-month guarantee. We are also fully insured and ARBOMaster approved.
Do you hold any approvals?
Yes. We hold ARBOMaster approved applicator status, and we are fully insured.
How long should I leave it?
Cure times vary by product and the temperature. We tell you how long to leave it before we go.
What sealant do you use?
The product depends on the job: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. Brands we use include Arbo and Everbuild.
Where do you work from?
We work from Crawley. Our applicators cover Amersham, along with the rest of our area.
How long does the job take?
It depends on the size of the job, but as a guide it takes anything from a few hours to several days, depending on the number of plots. We will give you a better idea when we quote.
Is it worth trying it myself?
You can, for simple jobs. Preparation is everything: all the old sealant out, and a clean, dry joint. We can always put it right if it fails.
DIY sealant or a professional job?
A DIY attempt doesn’t rule out a professional job. We remove it and do the joint properly, so just mention it when you contact us.
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.