Greater London · England
New-build mastic & snagging in Farringdon, Greater London
New build mastic for Farringdon and the surrounding area: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Gaps behind new kitchen upstands
- Gaps between new skirting and floors
- Cracked sealant around new window and door frames
Signs you need new build mastic in Farringdon
A new house holds a lot of water from the build, which takes a year or two to dry out. As it does, timber shrinks and joints open.
Look out for any of the following:
- Joints pulling apart as timber shrinks
- Leaking shower tray seals in a new home
- Sealant work across a run of new homes
- Worktop and upstand sealant coming away
As a London address, Farringdon can be tricky for parking: let us know about parking bays, permits or a driveway.
Before you book anyone
- How the colour is chosen
- What the quote includes, VAT included or not
- When the joint can take water or movement
- How the surfaces are prepared before sealing
How we handle new build mastic in Farringdon
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. We work on plot handovers, show homes and windows & doors, and people most often call us about leaking shower tray seals in a new home and beads laid onto grit and dust from the build.
New flats are going up across London, many of them in larger developments. In a new development, snags are often reported through the developer or the managing agent, and failed shower seals, open skirting joints and gaps at thresholds are typical.
You get a 12-month guarantee, the same in Farringdon as everywhere else we work.
- Location
- Farringdon (EC1V, EC1R, EC1P)
- Region
- Greater London
- Guarantee
- A year, on every job
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
What sealant work can’t fix
Before booking, it’s worth knowing the limits:
- Leaking fittings rather than failed sealant
- Movement caused by a poorly fitted tray or bath
- Structural cracks in walls or ceilings
Not sure which it is? You can phone 0345 464 0079 or send us an email and we’ll tell you honestly.
Joints and surfaces we work on
- Skirting & floors
- Show homes
- Kitchens
- Bathrooms & en suites
- Plot handovers
- Windows & doors
Also near Farringdon
Other services in Farringdon
New build mastic in Farringdon: local notes
Many of London’s new homes are flats in bigger developments, where snagging may go through the developer or managing agent. 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.
If you’ve bought a new home near Farringdon station, the sealant around baths, showers and frames is worth checking in the first year or two.
Farringdon is about 2 miles north of London, in Greater London. If you need new build mastic in Farringdon, please phone 0345 464 0079 or send us an email for a quick quote. We are based in Crawley and cover Greater London, Farringdon included. Our area takes in 764 places across Greater London, from the larger towns to small villages.
All of EC1V, EC1R and EC1P is within our area for new build mastic, from the main roads to the quietest streets. Local streets include Oat Lane, Shoe Lane and Long Lane, all of which we cover. Being close to the A1 and A4, Farringdon is easy for our applicators to reach for new build mastic. Other places close to Farringdon include Smithfield (1 mile south), Clerkenwell (1 mile north), Holborn (1 mile west), Blackfriars (1 mile south) and Temple Bar (1 mile south-west). Further out, we also cover Kensington (4 miles west), Walthamstow (6 miles north-east), Hampstead (4 miles north-west), Ruislip (14 miles west), Brompton (3 miles south-west) and Stockwell (4 miles south).
Local landmarks in Farringdon
Typical jobs here are in homes near The Castle Public House, St Mary-at-Hill and Barts Health Archives. Other local landmarks include St Peter and St Paul RC Primary School (less than half a mile north), Barbican Conservatory (under half a mile east) and Central Foundation Boys' School (0.8 miles east). Farringdon has its own railway station: Farringdon station. Other landmarks nearby include Museum of the Order of St John (less than half a mile north-east) and Gabriel's Wharf (0.9 miles south). Not far away are Ludgate Hill and Barnsbury Wood.
What affects the cost of new build mastic
We don’t publish a price list. What we look at:
- How many areas need sealing
- The type of sealant required
- Any working-time requirements on site
- Whether old sealant or filler has to be cut out
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. We take all of that into account in your quote.
Asking for a quote
Photos by email are helpful but not essential. Try to tell us:
- How many joints, rooms or windows are involved
- Any previous sealing or DIY work
- Access, such as stairs, a lift or height
- If it’s domestic, commercial or a hotel
There’s no standard price list, as no two jobs are quite the same. Instead, we send you a clear quote for your job. To arrange one, phone 0345 464 0079 or email us.
FAQs for Farringdon
Do you cover Farringdon for new build mastic?
Yes. We work across London and the South East, and Farringdon is part of that. Just ring 0345 464 0079 or send us an email with a few details of the job, and we’ll give you a clear quote.
Can parking be tricky for a visit in Farringdon?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. That way the visit can be planned around it.
Will you just run a new bead over the existing one?
No. We always remove the existing bead, the joint cleaned and primed where needed, and a new bead applied.
Why has my new-build shower seal failed already?
It’s common, and there are usually two reasons: movement as the house dries and settles, and sealant laid onto dust without primer. Cutting it out and resealing properly fixes both.
Can I send you my snagging list?
Yes. Photos of each sealant item help us quote. Items that need a plumber, tiler or the builder are flagged.
When is the best time to reseal in a new build?
Any seal that is leaking should be redone right away. For small cosmetic gaps, waiting until the house has settled can save doing them twice.
Do you remove the old sealant?
Yes. Sealing over old sealant is the main reason resealing fails early, and it’s something we never do.
How long will you be here?
A typical job takes a few hours for most snagging lists, longer for a run of plots. We will confirm how long when we quote.
What happens if it’s left?
Small cosmetic gaps can wait for the house to settle, but water getting through cannot. Not sure whether yours can wait? You can phone 0345 464 0079 or drop us an email with a few pictures and we’ll give you a straight answer. Damp from a failed joint spreads quietly in older London brickwork and timber, and once it shows in Farringdon, the repair is bigger than a sealant job.
What you pay reflects the work, not guesswork. That is why we ask about the job first and agree the price before starting.
Why us?
- 4.9 on Google from 180+ five-star reviews
- Anti-fungal silicone where joints get wet
- Trusted Arbo and Everbuild sealants
- Colour agreed with you before we start
Read how sealant jobs are priced and customer reviews.
DIY versus a professional finish
Sealing over old silicone is the commonest DIY error. New silicone will not bond to old, so it peels away and traps moisture behind it. All the old material has to come out first.
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
What happens on the day
Good joint work is mostly preparation, so that is where we spend the time. Joints are cleaned back and dried before anything new goes in. In total, it generally takes a few hours for most snagging lists, longer for a run of plots. In Farringdon, as in most of London, parking needs a little planning. A visitor permit or a nearby bay makes the visit run more smoothly.
- Each joint is checked for movement before work begins.
- 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.
- The finished joints are checked and the cure times given.
How to prepare
- Tell us about any water getting in
- On commercial sites, let us know about site rules
- For indoor joints, keep the area dry beforehand if you can
Get a quote
We quote each job on its own. Just phone 0345 464 0079 or drop us an email with the details, and photos are welcome.
Related advice
Keeping the joints in good condition
How long the joints last depends on use and care. Here’s what we suggest:
- Resist patching a failed seal with a tube from the DIY shop
- Follow the cure time we give you
- Act quickly if a seal starts to leak
- Ventilate bathrooms well, especially in the first year
Watch the joints as the house settles. Small gaps can appear as the house dries and can be resealed later.
A failed seal in a new home lets water into joists, plasterboard and ceilings. Early resealing keeps the job small.