Greater London · England
Havering-atte-Bower Window Mastic
Mastic around window and door frames, sills and patio doors for homes and businesses in Havering-atte-Bower and across Greater London. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Cracked sealant at the sill ends
- Damp patches on the reveal after heavy rain
- Old mastic that has gone black or come away
About our window mastic in Havering-atte-Bower
Frames and walls don’t 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. Typical jobs include gaps between the frame and the inside reveal and gaps left after new windows were fitted, on patio & French doors, window sills and timber windows & doors. Need a silicone sealant specialist near Havering-atte-Bower? That’s us.
Much of London’s older housing was built with timber sash windows, some still in place and some long since replaced. Whatever is in the opening now, the joint between frame and wall is what keeps the weather out, in Havering-atte-Bower as anywhere.
A one-year guarantee comes with the work, just as it does everywhere we cover.
- Location
- Havering-atte-Bower (RM4)
- Wider area
- Greater London
- Cover
- One year on every job
- Price
- A clear quote up front
- Call
- 07833 053749
- Updated
- 26 October 2026
DIY versus a professional finish
If you’re set on DIY, put the effort into 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 does not rule out a professional job. We cut it out and start again, so just mention it when you contact us.
What we do, step by step
Before we leave, we go over the finished joints with you. The work normally takes a few hours for a few frames, or a day or more for a whole house, depending on the amount of work. Parking in much of London is by permit or pay-and-display, so it helps to know what’s near you in Havering-atte-Bower. A visitor permit or a nearby bay makes the visit run more smoothly.
- We check how each frame can be reached safely.
- 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.
- The joint is shaped to shed water and the area tidied.
How to prepare
- Let us know about parking restrictions
- Try not to wet indoor joints just before the visit
- Let us know if you’ve seen damp or leaks
Getting a quote
Quotes start with a quick conversation. Describe the problem, the location and the size of the job, and we’ll explain how we’d tackle it. Whenever you’re ready, ring 07833 053749 or send us an email.
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Honest limits
Some problems need a builder, plumber or other trade rather than us:
- Condensation trapped between the panes
- A door that needs adjusting, rehanging or new seals
- Damp coming through the wall itself rather than the frame joint
Not sure which it is? You can phone 07833 053749 or send us an email and we’ll tell you honestly.
Surfaces we seal
- Composite doors
- Window sills
- uPVC windows
- Timber windows & doors
- Patio & French doors
- Aluminium frames
Why deal with it now?
Getting a straight, even bead on an outside frame takes practice, especially upstairs. A professional job is cut out properly, backed where needed and finished neatly, using a product chosen for the frame and wall. In a London flat, a failed joint rarely stays your problem alone: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
Instead of a standard rate, we look at what your job involves: the amount of work, the old material and the access. The price is agreed before we begin.
Why choose Mr Mastic in Havering-atte-Bower
- Arbo and Everbuild products
- We’re fully insured
- ARBOMaster approved applicator
- More than 20 years in sealant work
Take a look at how sealant jobs are priced or what customers say.
Landlords, agents and businesses in Havering-atte-Bower
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance that we can handle for you.
From a single let to a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a 12-month guarantee.
What we are called out for in Havering-atte-Bower
On timber frames, paint and putty build up around the joint. Mastic painted over many times cracks with the paint, and the wood moves with damp as well as heat.
Look out for these signs:
- A bead that does not match the frame
- Whistling draughts around closed windows
- Rain getting in at the frame or under the sill
- Old mastic that has gone black or come away
Schools such as Dame Tipping Church of England Primary School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages.
What your quote should include
- Which colour the sealant will be
- What guarantee comes with the work
- How hidden problems are handled
- What product goes in the joint
FAQs for Havering-atte-Bower
Do you work for landlords with property near Harold Wood station?
Yes, we work for landlords and letting agents. You can ring 07833 053749 or email us with the address and a few details, and we’ll give you a fixed price before any work starts.
Can parking be tricky for a visit in Havering-atte-Bower?
London parking needs a little planning, so let us know about permits, bays or a driveway when you book. The visit is then planned around what’s available.
Will you leave a mess?
We keep the work tidy. We protect what’s around the joints.
How long does it take to reseal the windows on a house?
That depends on the number of frames, how they’re reached and the state of the old mastic. We’ll tell you how long your job needs when we quote.
What sealant do you use?
We choose the sealant for the joint, not the other way round. Movement, water and weather all affect the choice, and we will explain our choice.
Do you work in Havering-atte-Bower?
Yes. We cover Havering-atte-Bower and the rest of Greater London, as part of our work across South East England, London and Scotland. For a quote, call 07833 053749 or send us an email.
Can I paint over the new sealant?
Not if it’s silicone. Tell us your decorating plans and we’ll pick a sealant to suit.
Is it OK to seal over old sealant?
No, and we never do. It can look neat for a few weeks, but the new layer lifts away from the old one. The old sealant has to come out completely.
How we quote for window mastic
The price is agreed before any work begins. It’s based on:
- How easy the joints are to reach
- The type of sealant required
- Mould in or behind the old joints
- How many rooms, windows or areas are involved
A few things move the cost up or down: the old material and how easily it comes out, any mould to treat, and whether the work is at height. We take all of that into account in your quote.
What to tell us for a quote
When you contact us, it’s useful to know:
- Where the job is, and your postcode
- Access, such as stairs, a lift or height
- What the problem is, such as mould, gaps, leaks or cracking
- If someone has resealed it before
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and add photos by email if you can.
Havering-atte-Bower homes and the weather
Historic houses like Hare Hall (about 2.6 miles south) are a reminder that the area around Havering-atte-Bower has older buildings as well as new. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic. In London conversions and blocks, the lease decides who is responsible for the frames, so it’s worth checking before booking.
As a London address, Havering-atte-Bower can be tricky for parking: tell us about permits, visitor bays or off-street space when you book. Rented homes near Harold Wood station change hands often, and renewing tired window mastic between tenants heads off draught and damp complaints.
Havering-atte-Bower is about 3 miles north-west of Harold Wood, in Greater London. Across the RM4 area, we cover window mastic for homes and businesses. 786 places in Greater London are on our list.
We cover every part of RM4 for window mastic and the streets around it. If you need window mastic at a property on North Road, Broxhill Road and Bower Farm Road or a nearby road, our applicators can take on the job. We also cover Chase Cross (1 mile south-west), Stapleford Abbotts (1 mile north-west), Redbridge (2 miles west), Lambourne End (2 miles west) and Lambourne (3 miles north-west). We also work in nearby towns such as London (15 miles south-west), St Pancras (15 miles south-west), Shoreditch (13 miles south-west), Walthamstow (9 miles west), Hoxton (13 miles south-west) and Whitechapel (13 miles south-west).
Landmarks near Havering-atte-Bower
Locally, jobs take us to homes and businesses close to The Top Oak pub, Havering Country Park and Bower Park Academy. The nearest railway station is Harold Wood station, roughly 2.7 miles south-east. Well-known places in the area include Romford Shopping Hall (2.8 miles south) and Harold Wood Hospital (2.5 miles south-east). Green spaces nearby include Bedfords Park.