Hertfordshire · England
Elstree New Build Mastic
New-build sealant joints in Elstree need attention? We remove the old material, prepare the joints and seal them properly, and the work is guaranteed for a year.
- Untidy sealant flagged on a snagging list
- Cracked sealant around new window and door frames
- Cracked caulk along new skirting
The process
On the day, we start by going over the job with you. Surfaces next to the work are protected before any work starts. Most jobs take anything from a few hours to several days, depending on the number of plots. Somewhere as small as Elstree, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- We look at why each joint failed, including any movement.
- We remove the failed sealant and clean the joints.
- Joints are dried and primed where the product calls for it.
- Baths are filled with water, then the new sealant is applied.
- We check every joint and leave you with the cure times.
Before we arrive
- Let us know about parking restrictions
- Try not to wet indoor joints just before the visit
- Plan for the work area to be out of bounds to pets and children
How to get a quote
Want a quote for new build mastic? Please phone 0345 464 0079 or email us with a few details. You’ll know what we plan to do, and what it will cost, before any work begins.
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New build mastic for homes and businesses in Elstree
Failed shower seals, gaps along the skirting and messy beads are common items on a new-home snagging list. If you’re still within the builder’s snagging or warranty period, tell them first. We work on kitchens, show homes and windows & doors, and people most often call us about leaking shower tray seals in a new home and kitchen sealant that has pulled off the wall.
Older homes in small places like Elstree often have timber floors that move with the seasons, so skirting and threshold joints need a flexible sealant rather than a rigid filler.
A 12-month guarantee comes as standard.
- Place
- Elstree (WD6)
- Wider area
- Hertfordshire
- Guarantee
- A year, on every job
- Quote
- A clear price before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Leave it or put it right?
DIY kits do not 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 Elstree, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
What it costs depends on the size of the job, how much old material has to come out and access to the work. We give a clear quote before any work starts, so you know where you stand.
Why Elstree customers choose us
- Anti-fungal silicone where joints get wet
- White, clear, grey or another colour, product permitting
- We agree the colour with you first
- Over 20 years’ experience
Take a look at how sealant jobs are priced and customer reviews.
Nearby places to Elstree
What else we do in Elstree
What affects the quote in Elstree
You will get a clear quote before work begins. It’s based on:
- How easy the joints are to reach
- Working hours on commercial sites
- The number and length of the joints
- How many rooms, windows or areas are involved
Rather than a set price list, we look at what your job involves: how many joints, what’s in them now and how we reach them. You will know the price before we begin.
What we need to know
When you contact us, it’s useful to know:
- Photos by email, if that’s easy
- How we’d reach the joints
- The type of property
- Any previous sealing or DIY work
For a quote, ring 0345 464 0079 or send us an email with the location and a short description of the problem. You’ll have a clear quote before we start.
New homes and floors in Elstree
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.
For new homes near Elstree & Borehamwood station, it’s worth checking the sealant early, while snags are still fresh.
Elstree is about 2 miles south-west of Borehamwood, in Hertfordshire. If you need new build mastic in Elstree, it’s easy to get a quote: please call 0345 464 0079 or email us. We are based in Crawley and cover Hertfordshire, Elstree included. Elstree is one of 381 places in Hertfordshire we cover for new build mastic. Our London page covers work nearby (13 miles or so).
Here we cover the WD6 postcode area for new build mastic. New build mastic is available to properties on High Street, West View Gardens and Summer Grove. Close by, we work in Deacon's Hill (1 mile east), Edgware Bury (1 mile south-east), Broadfields Estate (2 miles south-east), Borehamwood (2 miles north-east) and Edgware (2 miles south-east). Larger places within reach include Watford (5 miles west), Hemel Hempstead (10 miles north-west), St Albans (8 miles north), Welwyn Garden City (12 miles north-east), Harpenden (12 miles north) and Hoddesdon (14 miles north-east).
Near you in Elstree
Around Elstree, our work takes us to homes and buildings near The Holly Bush pub, London Academy and Aldenham Country Park and the streets around them. The closest station to Elstree is Elstree & Borehamwood station, roughly 1.1 miles north-east. Well-known places in the area include Elstree and Borehamwood Museum (1.4 miles north-east) and Royal National Orthopaedic Hospital (0.8 miles south). Open spaces near Elstree include Darland's Lake and Edgware Way Grassland.
Your questions about new build mastic in Elstree
Is Elstree in your area for new build mastic?
Yes, Elstree is within the area we cover. Our work covers London and the South East. Just ring 0345 464 0079 or drop us an email with a few details of the job.
Can you help a landlord with a rental near Elstree & Borehamwood station?
Yes, landlords and agents are among the people we work for. Just ring 0345 464 0079 or send us an email with the address and what needs doing, and we’ll give you a clear price.
Is it normal for sealant to crack in a new home?
Cracking in the first couple of years is common as timber and plaster dry out. Poor preparation at handover adds to it.
What sealant do you use?
It depends on the joint: anti-fungal sanitary silicone in wet areas, and other sealants where joints move or face the weather. Brands we use include Arbo and Everbuild.
What do you need from me for a quote?
Just the basics: where it is, what you’ve noticed and how we reach it. Then ring 0345 464 0079 or drop us an email.
Do you do commercial work?
Yes, regularly. We can plan bigger jobs in stages to suit the site.
Is the work guaranteed?
Yes. Each job is guaranteed for twelve months.
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.
Common problems we fix in Elstree
Once people move in, baths and trays take weight and bed down. A bath sealed empty drops slightly when filled, straining the joint and the sealant may split.
Keep an eye out for any of the following:
- Messy sealant that spoils new finishes
- Cracked sealant around new window and door frames
- Sealant applied over dusty or wet surfaces
- Worktop and upstand sealant coming away
Around Elstree, as everywhere, new build mastic is only as good as the preparation behind it.
Questions to ask before booking
- What preparation is included
- What happens if they find a problem under the old sealant
- Whether the sealant suits the joint
- How much experience the applicator has
How the job changes by surface
Skirting and floors
Where the floor meets a bath panel or kitchen plinth, the joint keeps mop water out. We seal them with a sealant suited to wet areas.
Show homes
Show homes need sealant that looks right from day one. Every bead is neat and coloured to suit the room.
Can I do it myself?
If you’re set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it does not work out, we can still put it right.
The biggest DIY mistake is sealing over old sealant. Silicone does not stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed first.
How to look after the new joints
Aftercare is simple:
- Use the extractor fan every time you shower
- Resist patching a failed seal with a tube from the DIY shop
- Record problems with dated photos
- Wipe joints with warm soapy water
Avoid standing on the rim of the bath or the edge of the tray while the sealant cures. Report any movement in a bath or tray.
If a shower tray or bath seal splits in the first year, look for movement. Getting it resealed properly, and any movement checked, stops it recurring.