Kent · England
Window & door mastic in Northwood, Kent
Window and door frames in Northwood need attention? We remove the old material, prepare the joints and seal them properly, with a 12-month guarantee.
- Rain getting in at the frame or under the sill
- Rushed sealant from a window installation
- Leaking joints at the ends of sills
Can I do it myself?
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it lifts and traps water and mould underneath. All the old material has to come out first.
A careful DIYer can reseal a simple joint, 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.
Window mastic in Northwood, done properly
Over two decades of sealing frames has taught us which products suit which walls. We are ARBOMaster approved and fully insured, and every job is covered by a 12-month guarantee. We work on composite doors, aluminium frames and window sills, and the jobs we see most are cold air getting in at the frame edge and gaps left after new windows were fitted.
Many houses in smaller places like Northwood have conservatories, garden rooms or patio doors. Those joints need the same attention as the main windows.
A one-year guarantee comes as standard, so you’re not left on your own once the job is done.
- Place
- Northwood (CT12, CT10, CT11)
- Wider area
- Kent
- Guarantee
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
The process
On the day, we look over the joints with you first. We protect the surfaces around the joints before any work begins. Most jobs take anything from an hour or two to a full day, depending on how many frames there are. Parking around Northwood is usually easier than in a town centre, but mention any lanes, gates or long drives. If the job is outside, tell us about side access and how high the joints are.
- Each frame is looked over and we agree which ones need resealing.
- We remove the old mastic and clean the frame edge and wall.
- Deep gaps get closed-cell backing rod to set the depth.
- A flexible exterior sealant is applied in a colour to suit the frame.
- Every joint is tooled smooth and checked before we leave.
Before we arrive
- Keep pets and children clear of the area while we work
- Let us know about earlier repairs to the joints
- Clear items away from the joints we are working on
Ask for a quote
For a quick quote, get us on the phone, or email us if that’s easier. Describe what needs sealing and we will talk you through the work and give you a clear quote.
Advice
When to call us in Northwood
A lot of older mastic was never designed to stay flexible. Once it has hardened, the frame’s movement tears it from the wall, and a gap opens along one edge.
It’s worth asking for a quote if you see:
- Gaps where the sill meets the wall
- Draughty joints inside around the window
- Old mastic that has gone black or come away
- Mastic that has split away from the wall
In the older streets around St Mark's Church, the joint between an old wall and a newer frame is generally the first place rain gets in.
Before you book anyone
- What the cure time is
- Which sealant they’ll use, and why
- How the joint is cleaned and prepared
- What happens if the job turns out different
Different surfaces, different methods
Aluminium frames
Bi-fold and sliding aluminium doors have long frame joints, and the bottom joint sees the most water. Each is cleaned, backed where deep and resealed.
Patio & French doors
Not every patio door leak is a mastic problem: worn seals, blocked drainage slots or a poor threshold detail can be the cause. We check before we reseal.
How we quote for window mastic
For a quick quote, just ask. What matters most is:
- How many rooms, windows or areas are involved
- How much there is to do
- The type of sealant required
- Any mould that needs treating
Combining jobs into one visit usually makes better use of the time than several visits, so tell us about everything that needs sealing. We will give you a clear price for the lot.
What we need to know
A few details help us give you an accurate quote. When you get in contact, it helps to mention:
- The address or postcode of the job
- Whether it has been sealed before
- The rough size of the job
- The type of property
Every job is quoted individually, so start by telling us what you need. Just call 0345 464 0079 or send us an email with the details and send photos if you have them.
Aftercare tips
No joint lasts for ever, but care makes a real difference. A few tips:
- Ventilate rooms so frames do not stay wet inside
- Do not aim a pressure washer at the joints
- Keep paint and stain on wooden frames in good order
- Keep drainage slots and sill grooves clear
A yearly look round the frames is enough. Cracks and lifting edges are easy to spot early.
Wet, windy weather is when failed mastic shows itself, but sealant goes on best when frames and walls are dry. Sorting cracked mastic early means the joint is sound before the bad weather.
Common questions in Northwood
Will you come out to Northwood?
Yes, we do. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Can you help a landlord with a rental near Ramsgate station?
Yes, we work for letting agents and landlords. You can ring 0345 464 0079 or drop us an email with the address and a few details, and we will give you a fixed price before we start.
Do you take out the old sealant first?
Yes. We cut out all the old sealant and clean the joint before resealing.
Can you seal over the old sealant?
No. Fresh sealant doesn’t stick to old sealant, and anything trapped underneath, including mould and water, stays there. It all has to come out first.
How do I get a quote for window mastic in Northwood?
It depends on the job, so we quote each one individually. For a quick quote, ring 0345 464 0079 or email us and let us know what needs doing and where.
Will there be a smell?
Some sealants have a smell while they cure. Opening a window helps.
Do you work on first-floor windows?
Yes, as long as they can be reached safely. Let us know about access when you ask for a quote and we will plan for it.
Can you do several jobs on one visit?
Of course. Combining jobs makes good use of the visit, so mention them when you ask for a quote.
Windows and doors in Northwood
Northwood is close to the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. That is hard on the mastic around window and door frames, especially on the side facing the sea. Historic houses like Quex Park (about 3.6 miles west) are a reminder that the area around Northwood has older buildings as well as new. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
If you look after a building such as Dame Janet Primary Academy, its window and door frames need their mastic kept sound, just like a home’s. If you let a flat or house near Ramsgate station, cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
Northwood is about 1 mile north-west of Ramsgate, in Kent. Anywhere in CT12, we cover window mastic for homes and businesses. Our Kent coverage runs to 922 places, Northwood among them. Chelmsford is on our list too, around 48 miles away.
Every address in CT12, CT10 and CT11 is within our area for window mastic. If you need window mastic at a property on Gwyn Road, Coxes Lane and Roman Road or anywhere close by, our applicators can take on the job. You’ll find Northwood on the A254 and A256, which makes it straightforward to reach with everything needed for window mastic. Nearby, we also carry out window mastic in Ramsgate (1 mile south-east), Upton (1 mile east), St Lawrence (1 mile south), St Peter's (1 mile north-east) and Broadstairs (1 mile north-east). We also work in nearby towns such as Canterbury (15 miles west), Dover (15 miles south), Deal (9 miles south), Herne Bay (12 miles west), Walmer (10 miles south) and Wincheap (15 miles west).
Near you in Northwood
In Northwood, that means homes and buildings near The Derby Arms, The Charles Dickens School and The Royal Harbour Academy. The closest station to Northwood is Ramsgate station, about 0.8 miles south of the centre. A little further out are Westwood Cross (0.5 miles north-west) and Ramsgate Museum (1.4 miles south-east). Not far away are Sandwich and Pegwell Bay.
Work for landlords, hotels and businesses
Failed sealant is one of the commonest items on a check-out report, and it’s easy to sort out between tenants. Several properties can be quoted together.
From a single let to a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a one-year guarantee.