Kent · England
Window & door mastic in St Lawrence, Kent
Mastic around window and door frames, sills and patio doors for St Lawrence, backed by a 12-month guarantee. Ask us for a quote.
- Old mastic that has gone black or come away
- Rushed sealant from a window installation
- Water coming in at the bottom corners of a door
Why deal with it now?
Failed mastic is not a reason to replace sound windows. If the frames and glass are in good order, resealing the joints is often all that’s needed. Problems with the glass or gaskets are for a window company, and we’ll say so. In an older home around St Lawrence, damp from a failed joint can get into timber and plaster, and that’s a much bigger job than renewing the sealant.
We do not show prices on the website, because each job is priced on what it involves. Call for a quick quote and we will talk you through it.
Why book with us
- Anti-fungal sanitary silicone in wet areas
- Full insurance on every job
- We never seal over old sealant
- Sealant colour chosen to suit
Read our cost guide and our reviews.
Window mastic in St Lawrence, done properly
Frames and walls do not move together. Heat and cold make frames grow and shrink against brick or render that hardly moves. That’s why the joint needs a flexible, low-modulus sealant rather than something rigid. If you have a bead that doesn’t match the frame and cold air getting in at the frame edge, we can put it right, on uPVC windows, patio & French doors and aluminium frames alike.
Around St Lawrence, conservatories, garden rooms and patio doors are often part of the house. Their glazing joints and frame seals are as much a part of the job as the windows.
Whatever the size of the job, you get the same one-year guarantee.
- Place
- St Lawrence (CT11, CT12)
- Region
- Kent
- Cover
- 12 months on all our work
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
DIY sealant or a professional job?
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.
A DIY attempt doesn’t rule out a professional job. We cut it out and start again, so just mention it when you contact us.
Different surfaces, different methods
uPVC windows
We clean the frame edge carefully so the plastic isn’t marked, then the new bead is laid against the frame and the wall.
Composite doors
Draughts round the door leaf usually come from worn seals or adjustment, not the mastic. We’ll tell you if that’s what we find.
Looking after it afterwards
A little care helps the new joints last. We recommend:
- Keep solvents and bleach off the sealant
- Repaint timber before it’s bare
- Wipe condensation off the frames
- Check the mastic once a year
Most silicone sealants will not take paint, so mention any painting plans before any work starts. There are paintable sealants for joints that need it.
On timber windows, water behind the joint can lead to rot. Once wood has rotted, it needs repair before it can be sealed, so early resealing is worth it.
Nearby places to St Lawrence
Other services in St Lawrence
What happens on the day
Once we’re on site, we compare the joints with what we discussed. If anything is different, we explain it before carrying on. After that, the work takes anything from an hour or two to a full day, depending on how many frames there are. In a smaller place like St Lawrence, parking is seldom the issue; lanes, gates and long drives are worth mentioning. If the job is outside, tell us about side access and how high the joints are.
- First, we confirm safe access to each frame.
- All the failed sealant is cut away, along with any loose debris.
- Frame and wall are cleaned and must be dry before sealing, and primed where the sealant calls for it.
- Backing rod fills deep voids and the sealant goes in on top.
- We tool the joint so water runs off, then clear up.
How to prepare
- Mention if the joints have been sealed before
- Tell us if parking is tricky
- For indoor joints, keep the area dry beforehand if you can
Get a quote
For window mastic in St Lawrence, ring 0345 464 0079 or email us. Tell us what the problem is and where, and we’ll agree the price before any work begins.
Related advice
St Lawrence homes and the weather
St Lawrence is within about 1 mile of the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. Both are hard on the mastic around window and door frames, which can dry out and crack sooner where a building faces the weather. Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
For site and facilities teams at buildings such as Ellington Infant School, larger buildings have plenty of frames, and the mastic around each one ages. Homes close to Church of St Laurence include some older properties, and frames set in older brick or stone need a sealant that suits the wall as well as the frame.
St Lawrence is about 1 mile west of Ramsgate, in Kent. Wherever you are in the CT11 postcode area, we cover window mastic for homes and businesses. Our area takes in 922 places across Kent. There’s also a page for Chelmsford, about 48 miles away.
Work in CT11 and CT12 works the same way as everywhere else we cover. Window mastic is available to properties on Park Road, Saxon Road and Downs Road and the roads around them. With the A255 close by, St Lawrence is easy for our applicators to reach for window mastic. If you’re just outside St Lawrence, we cover Ramsgate (1 mile east), Northwood (1 mile north), Upton (2 miles north-east), St Peter's (2 miles north) and Broadstairs (2 miles north-east). Within a short drive, we also cover Canterbury (14 miles west), Margate (3 miles north), Dover (14 miles south), Deal (8 miles south), Herne Bay (12 miles west) and Tower Hamlets (15 miles south).
Around St Lawrence
Around St Lawrence, our work takes us to homes and buildings near Chatham House Grammar School, Churchill House School With Railed Area and The Admiral Fox pub, among other places. St Lawrence has its own railway station: Ramsgate station. Nearby you will also find Westwood Cross (1.5 miles north) and Ramsgate General Hospital (0.6 miles south-east). The countryside around St Lawrence includes Sandwich and Pegwell Bay.
St Lawrence questions
Do you cover smaller places like St Lawrence?
Yes, we do. Our work covers London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Is window mastic in a coastal place like St Lawrence any different?
Coastal weather is harder on outside sealant: there’s more wind-driven rain and, closer to the shore, salt in the air. Choosing the right sealant for the frame and wall, laid at the right depth, helps it last.
Are you insured?
Yes. We’re fully insured, and we can confirm the details when we quote.
Is it OK to seal over old sealant?
No. New silicone will not bond to old silicone, and it traps any mould or water underneath. We remove it all first.
Where is Mr Mastic based?
We are based in Crawley, and we cover South East England, London and all of Scotland.
Can you reach windows above the ground floor?
Usually, yes. Access is planned before work begins, so mention the height and anything in the way.
Will it make a mess?
No. We protect the surfaces around the joints, and we clear up the old sealant and our materials before we leave.
Do you seal inside as well as outside?
Yes. Outside is the weather seal; inside closes the gap to the plaster. We can do either or both.
Common problems we fix in St Lawrence
Some failures date back to when the windows were fitted. Sealant run over dust, wet brick or loose mortar didn’t grip properly, so it comes away long before its time.
Any of these means the joints need attention:
- Water coming in at the bottom corners of a door
- Rushed sealant from a window installation
- Gaps between the frame and the inside reveal
- Whistling draughts around closed windows
Letting a property close to Ramsgate station? Then renewing tired window mastic between tenants heads off draught and damp complaints.
What your quote should include
- The length of the guarantee
- Whether all the old sealant comes out first
- How hidden problems are handled
- What the cure time is
When it is not the sealant
New sealant can’t fix everything, and we’d rather say so up front. It won’t solve:
- Condensation trapped between the panes
- Draughts through the window seals rather than the frame
- Broken hinges, locks or handles
If you are not sure, just call 0345 464 0079 or drop us an email and we will give you a straight answer before you book.
Surfaces we seal
- Patio & French doors
- Aluminium frames
- Composite doors
- Window sills
- Timber windows & doors
- uPVC windows