Hertfordshire · England
New Build Mastic in Throcking
Plot mastic for developers and snagging failed sealant in new homes in Throcking, with a one-year guarantee on every job. Ask us for a quote.
- Messy sealant that spoils new finishes
- Cracked sealant around new window and door frames
- Shower seals failing in the first year or two
About our new build mastic in Throcking
Snagging sealant properly means taking the failed bead out completely. New silicone will not bond to old silicone, so it all comes out before we clean, dry and reseal. Common call-outs are for leaking shower tray seals in a new home and plot mastic for developers ahead of handover, on bathrooms & en suites, windows & doors and kitchens.
Work in a small place like Throcking just needs the journey and access planning, and once on site, the job is the same as anywhere.
You are covered for a year from the day we finish. If there’s a problem with it, please phone 0345 464 0079 or send us an email.
- Where
- Throcking (SG9)
- Region
- Hertfordshire
- Cover
- A year, on every job
- Quotes
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
New build mastic around Throcking
Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Whether the job is in Throcking itself or nearby, the right material for each joint matters as much as a neat finish.
Throcking is about 6 miles north-east of Stevenage, in Hertfordshire. We carry out new build mastic for homeowners, landlords and businesses in Throcking and the surrounding area. Throcking is one of 381 places in Hertfordshire where we work. Chelmsford is on our list too, about 28 miles from Throcking.
Here we cover the SG9 postcode area for new build mastic. Nearby, we also carry out new build mastic in Cottered (1 mile south-west), Chipping (1 mile north-east), Buntingford (2 miles east), Aspenden (2 miles south-east) and Layston (2 miles east). Larger places within reach include Stevenage (6 miles south-west), Bishop's Stortford (11 miles south-east), Welwyn Garden City (12 miles south-west), Hitchin (9 miles west), Hoddesdon (14 miles south) and Hatfield (15 miles south-west).
Around Throcking
Nearby you’ll also find Clothall Castle (4.1 miles west). Not far away are Hawkins Wood.
When something else is needed
We’d rather tell you now than do work that will not last, so these are the limits:
- Movement caused by a poorly fitted tray or bath
- Damaged fittings that need replacing
- Leaking fittings rather than failed sealant
If you are not sure, just call 0345 464 0079 or drop us an email and we’ll give you a straight answer.
Where we work in Throcking
- Windows & doors
- Bathrooms & en suites
- Show homes
- Skirting & floors
- Kitchens
- Plot handovers
Also in Throcking
Surface by surface
Plot handovers
Plot mastic is carried out to the developer’s schedule. Joints are prepared properly before sealing to keep callbacks down.
Skirting and floors
Floors and skirting move as the house dries and the heating runs. Caulk cracks; a flexible sealant moves with it.
Throcking: your questions answered
Do you cover Throcking for new build mastic?
Yes, Throcking is within the area we cover. We work across London and the South East. You can call 0345 464 0079 or send us an email and let us know what needs doing.
Will you come out to Throcking?
Yes, we do. Our work covers London and the South East, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
Will you leave a mess?
No. We protect the surfaces around the joints, and we tidy up before we go.
What does new build mastic cost?
The cost depends on the size of the job, access and how much old sealant has to come out. Call for a quick quote.
Do you work for developers?
Yes. We take on second-fix sealant work across new plots. We clean and prime joints properly to keep callbacks down.
Do you do commercial work?
Yes, regularly. Larger jobs can be planned room by room or area by area to suit the site.
Can I add another job to the visit?
Yes. Tell us about everything you’d like done.
Should I try DIY first?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Can I do it myself?
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, and the work is guaranteed for a year.
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. Everything old must be removed first.
What happens on the day
Before we leave, we go over the finished joints with you and explain the cure time. The visit itself usually takes anything from a few hours to several days, depending on the number of plots, depending on how much there is to do. In a small place like Throcking, access is normally the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- First, the list of joints is agreed from your snagging sheet or plot schedule.
- The failed sealant is removed completely.
- 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.
Before we arrive
- Clear items away from the joints we are working on
- Mention any sign-in or site rules at work premises
- Mention if the joints have been sealed before
Ask for a quote
Want a quote for new build mastic? Please ring 0345 464 0079 or drop us an email with a few details. You’ll know what we plan to do, and what it will cost, before any work begins.
Read more
Why act early in Throcking
A failed shower or bath seal in a new home lets water into floors and walls that are still drying out. Dealing with it early keeps the damage away from ceilings, floors and finishes. Older cottages and farmhouses around Throcking can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
There are no prices on our website, because each job is priced on what it involves. Call for a quick quote.
Why Throcking customers choose us
- Full insurance on every job
- Sealant colour chosen to suit
- Anti-fungal silicone where joints get wet
- White, clear, grey or coloured to suit, where the product allows
Take a look at how sealant jobs are priced and our reviews.
Do you need new build mastic in Throcking?
Sealant applied onto damp surfaces does not bond well. Site programmes don’t always leave time for joints to dry.
These are the problems we are asked about most:
- Skirting joints opening in the first winter
- Leaking shower tray seals in a new home
- Second-fix sealing on new plots
- Joints pulling apart as timber shrinks
Around Throcking, as everywhere, new build mastic is only as good as the preparation behind it.
What your quote should include
- How the joint is cleaned and prepared
- Whether the sealant suits the joint
- What happens if the job turns out different
- When the joint can take water or movement
How we quote for new build mastic
There’s no set price list, because no two jobs are the same. The quote depends on:
- The old material and how stubborn it is
- Any working-time requirements on site
- Access and height
- Whether there’s mould to deal with
What you pay reflects the work, not guesswork. That is why we ask a few questions first.
Helping us quote
When you contact us, these details help:
- A few photos by email, if you can
- What the problem is, such as mould, gaps, leaks or cracking
- Any previous sealing or DIY work
- Whether it’s a home or a business
Every job is quoted individually, so the first step is telling us about yours. Just call 0345 464 0079 or drop us an email with the details and send pictures if you have them.