Hertfordshire · England
New-build mastic & snagging in Farnham, Hertfordshire
Our applicators work in Farnham on plot mastic for developers and snagging failed sealant in new homes. Old sealant removed completely, joints prepared properly and every job guaranteed for a year.
- Cracked sealant around new window and door frames
- Plot mastic for developers ahead of handover
- Untidy sealant flagged on a snagging list
How we handle new build mastic in Farnham
We never seal over a failed new-build bead. New silicone won’t bond to old silicone, so the joint is cut out, cleaned, dried and resealed. If you are dealing with sealant work across a run of new homes and new-build shower sealant that has already split, we can help, whatever the surface.
Around Farnham, older homes often have timber floors that move through the year, which is why skirting and threshold joints need a flexible sealant, not filler.
Every job comes with a 12-month guarantee, wherever you are in Hertfordshire.
- Place
- Farnham (CM23)
- Region
- Hertfordshire
- Guarantee
- One year on every job
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Surface by surface
Skirting and floors
Wet-area floor joints need a flexible seal. We seal them with a sealant suited to wet areas.
Windows and doors
External mastic around new windows and doors is sometimes rushed or missed. It’s resealed with an exterior sealant suited to the frame and wall.
How it works
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 in a single home, including the tidy-up. Somewhere like Farnham needs a little journey planning: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- First we work through your snagging list or plot schedule with you.
- The old bead comes out in full, with no layer left behind.
- 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.
Before we arrive
- For indoor joints, keep the area dry beforehand if you can
- Tell us about any water getting in
- Let us know about stairs, lifts or work at height
Getting a quote
For a quick quote, get us on the phone, or send an email if you’d rather. Describe what needs sealing and we will talk you through the work.
Related advice
Quotes for new build mastic in Farnham
Call for a quick quote. The main things that affect it are:
- The number of rooms or windows
- The amount of work
- Which sealant suits the joint
- Whether there’s mould to deal with
Commercial jobs are quoted on the same basis as homes: how much there is to do, how we reach it and what it needs. Call for a quick quote and we will go through it with you.
What we need to know
You don’t need to know the technical terms. It helps if you can tell us:
- Where the property is
- Any access issues, like height or stairs
- Pictures of the joints, sent by email
- Whether it has been sealed before
To get a quote, ring 0345 464 0079 or send us an email with the location and a short description of the problem. You will have a clear quote before we start.
DIY versus a professional finish
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
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 fails, we can still redo it.
What new build mastic looks like in Farnham
The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Around Farnham, as everywhere, new build mastic is only as good as the preparation behind it. For new homes near Stansted Mountfitchet station, it’s worth checking the sealant early, while snags are still fresh.
Farnham is about 2 miles north of Bishop's Stortford, in Hertfordshire. For new build mastic in and around Farnham, please phone 0345 464 0079 or drop us an email for a quick quote. We’re based in Crawley and cover Hertfordshire. Our area takes in 381 places across Hertfordshire, large and small. For nearby work, see our Chelmsford page.
All of CM23 is within our area for new build mastic, from the main roads to the quietest streets. Other places close to Farnham include Uppend (1 mile north), Mount Pleasant (1 mile north), Manuden (2 miles north-east), Bentfield Green (2 miles east) and Stansted Mountfitchet (2 miles east). We also work in nearby towns such as Stevenage (14 miles west), Hoddesdon (12 miles south-west), Hertford (12 miles south-west), Ware (10 miles south-west), Baldock (15 miles north-west) and Broxbourne (13 miles south-west).
Around Farnham
Around Farnham, our work takes us to homes and buildings near St Mary's Catholic School. Farnham’s nearest station is Stansted Mountfitchet station, about 2.4 miles east. Well-known places in the area include Moated mound (1.7 miles south-west) and Herts and Essex Hospital (2.8 miles south-east). For a walk, there’s Portingbury Hills and Aubrey Buxton Nature Reserve.
Towns and villages near Farnham
What else we do in Farnham
Keeping the joints in good condition
A little care helps the new joints last. We recommend:
- Follow the cure time we give you
- Act quickly if a seal starts to leak
- Wipe joints with warm soapy water
- Photograph failed sealant before it’s redone
Wipe the sealant with warm soapy water. Avoid abrasive pads and strong solvents, which can damage the surface.
If a shower tray or bath seal splits in the first year, look for movement. Have it resealed, and the tray or bath checked, before it gets worse.
Why it’s worth doing now in Farnham
Running a new bead over the builder’s sealant might look tidy for a few weeks, but it cannot bond to what’s underneath. Taking it all out and starting again is the only way to get a lasting seal. Older cottages and farmhouses around Farnham can have timber floors and frames, and water through a failed joint can rot timber if it’s left.
A few things move the cost up or down: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether the work is at height. Your quote takes all of that into account.
Why book with us
- Anti-fungal silicone where joints get wet
- More than 20 years in sealant work
- Fully insured
- Old sealant always removed completely
Take a look at what affects the cost or what customers say.
Work for landlords, hotels and businesses
Housing providers, facilities teams and property managers book us too in Farnham and across Hertfordshire. We can quote a run of properties together, and we’re fully insured.
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Resealing at the right time is simple maintenance that we can handle for you.
Common questions in Farnham
I let a flat near Stansted Mountfitchet station. Can you help?
Yes, landlords and agents are among the people we work for. You can ring 0345 464 0079 or email us with the details for a clear quote.
Do you cover Farnham for new build mastic?
Yes, Farnham is within the area we cover. Our work covers London and the South East. Just call 0345 464 0079 or send us an email with a few details of the job, and we will give you a clear price.
Should I try DIY first?
You can, for simple jobs. The key is preparation: remove all the old material and work on a clean, dry joint. If it does not work out, we can redo it.
Should I wait before resealing?
That depends on the joint. Failed seals in wet areas need doing now, while small cosmetic gaps can wait a while.
Do you use white or clear sealant?
We use white, clear or a colour to suit the finishes. Let us know your preference when you ask for a quote.
Do you work for hotels and businesses?
Yes. Larger jobs can be planned room by room or area by area to suit the site.
Will you leave a mess?
We keep the work tidy. Nearby surfaces are protected, and the area is left clean when we finish.
Do you work for developers?
Yes. Second-fix sealing in bathrooms, kitchens, frames and floors is part of what we do. Good preparation keeps snagging to a minimum.