Greater London · England
Richmond Window Mastic
Mastic around window and door frames, sills and patio doors for homeowners, landlords and businesses in Richmond. ARBOMaster approved applicators, fully insured, with a one-year guarantee.
- Gaps between the frame and the inside reveal
- Sealant in the wrong colour for the frame
- Whistling draughts around closed windows
DIY versus a professional finish
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
If you are set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it does not work out, we can still put it right.
Window mastic in Richmond, done properly
Every window and door frame has a gap around it, and mastic is what closes it. Once that seal fails, wind and rain find the gap. The old mastic is removed and the joint resealed with a flexible exterior sealant. We work on window sills, uPVC windows and patio & French doors, and the jobs we see most are black, perished sealant on frames and cracked or shrunken mastic around the frame.
Much of London’s older housing was built with timber sash windows, some still in place and some long since replaced. Either way, the mastic between frame and brickwork is what stops draughts and rain getting in, in Richmond as anywhere.
The work is covered for a year after we finish. If anything is not right with it, phone 0345 464 0079 or email us.
- Place
- Richmond (TW9, TW1, TW10)
- Region
- Greater London
- Cover
- One year on every job
- Quote
- A clear price before we start
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
How it works
We keep the work tidy and contained to the area we are working on, so you can carry on as normal. Expect the work to take a morning for a couple of windows and a door, and we tell you how long to leave it before we go. For a job in Richmond, parking and access are the things to plan: let us know about parking, the floor we will be working on and any lift or shared entrance.
- First we look at every frame and agree the list.
- The old mastic is cut out and the surfaces cleaned back.
- Where gaps are deep, backing rod goes in first.
- New exterior sealant goes on in a matching colour and is tooled smooth.
- Finally we tidy up and check each joint.
Preparing for the visit
- Keep children and pets away from the work area
- Mention if the joints have been sealed before
- For indoor joints, keep the area dry beforehand if you can
How to get a quote
For a quote, phone 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. We will send you a clear quote before any work starts.
Advice
What affects the cost of window mastic
Call for a quick quote. What matters most is:
- Working hours on commercial sites
- How many rooms, windows or areas are involved
- How easy the joints are to reach
- The type of sealant required
Every job is a little different, so we quote each one individually. Size, access and the product the joint needs all play a part.
What to tell us for a quote
A few details help us give you an accurate quote. When you ask for a quote, tell us:
- The type of property
- The rough size of the job
- How we’d reach the joints
- Where the property is
For window mastic in Richmond, phone 0345 464 0079 or email us. A short description of the job and where it is helps us quote, and you will get a clear quote before any work starts.
Leave it or put it right?
Not every sealant suits a window. Decorators’ caulk and bathroom silicone aren’t designed for outside joints that move. An exterior, low-modulus sealant stays flexible in sun and frost. In a flat in Richmond, failed sealant seldom stays inside your own four walls: water from a shower or window joint can reach the flat below, and gaps in fire-stopping matter to everyone in the building.
Doing several joints on one visit is normally more efficient than separate visits. We will give you a clear quote for the lot.
Why Richmond customers choose us
- An ARBOMaster approved applicator
- Sanitary silicone with an anti-fungal additive in wet areas
- Old sealant always removed completely
- Over 20 years’ experience
Take a look at our cost guide or our reviews.
Windows and doors in Richmond
The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. In a converted house or block, who looks after the windows depends on the lease, so check that before you book.
In the older streets around The Vineyard Church, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall. Schools such as The Vineyard School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages. If you let a flat or house near Richmond station, cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
Richmond is about 5 miles south-west of Kensington, in Greater London. Jobs in Richmond get the same care as everywhere else we work: old sealant removed completely, careful preparation and a 12-month guarantee. Across Greater London, we cover 764 places, and Richmond is one of them. London is on our list too, around 9 miles away.
All of TW9, TW1 and TW10 is within our area for window mastic, from the main roads to the quietest streets. You will find streets such as Kew Road, Dee Road and Park Road, all of which we cover. If you’re just outside Richmond, we cover Petersham (1 mile south), St Margarets (1 mile west), Eel Pie Island (1 mile south-west), Ham (1 mile south) and Isleworth (2 miles north-west). Within a short drive, we also cover London (9 miles east), City of Westminster (8 miles north-east), Marylebone (8 miles north-east), Kensington (5 miles north-east), St Pancras (9 miles north-east) and Shoreditch (11 miles north-east).
What’s near Richmond
We work in homes and buildings around The Victoria pub, Christ's Church of England Comprehensive Secondary School and Terrace and Buccleuch Gardens and the streets around them. The nearest railway station is Richmond station, roughly 0.5 miles north of the centre. A little further out are Eel Pie Island Museum (1.2 miles south-west) and South Middlesex Hospital (1.6 miles west). For a walk, there’s Richmond Hill and Ham Lands.
What sealant work cannot fix
In fairness, some problems need a different trade:
- Condensation trapped between the panes
- A frame that has rotted at the joint
- Broken hinges, locks or handles
If in doubt, phone 0345 464 0079 or drop us an email and we will say what we think.
Joints and surfaces we work on
- Composite doors
- Timber windows & doors
- uPVC windows
- Patio & French doors
- Aluminium frames
- Window sills
Keeping the joints in good condition
Aftercare is simple, and it makes a real difference:
- Keep paint and stain on wooden frames in good order
- Air rooms to keep condensation down around windows
- Use gentle cleaners on frames and sealant
- Keep solvents and bleach off the sealant
Most silicone sealants won’t take paint, so mention any painting plans before work begins. We can use a paintable sealant where that matters.
Draughts get worse, not better. As old mastic keeps shrinking, the gap widens, and a cold room gets colder. Resealing closes it.
Places near Richmond
Other services in Richmond
Your questions about window mastic in Richmond
Is Richmond in your area for window mastic?
Yes, Richmond is within the area we cover. We work across London and the South East. Just ring 0345 464 0079 or email us with a few details of the job, and we will give you a clear price.
Is parking an issue for window mastic in Richmond?
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.
I’m a tenant. Can you help?
We can work for tenants, landlords or agents. Just make sure your landlord agrees.
What should I tell you?
Where the job is, what the problem is and roughly how big it is. If you can, email a few photos.
Can you reach windows above the ground floor?
Normally, yes. Access is planned before we start, so mention the height and anything in the way.
Do you hold any approvals?
Yes. Mr Mastic is an ARBOMaster approved applicator, and we’re fully insured.
Can I paint over the new sealant?
It depends on the sealant. Silicone is not paintable, but some hybrid sealants are. Tell us if you’re decorating and we will choose accordingly.
Should I try DIY first?
Sometimes. Preparation is everything: all the old sealant out, and a clean, dry joint. If it does not work out, we can redo it.
Different surfaces, different methods
Timber windows & doors
On period timber windows, traditional sand mastic is sometimes the better choice. We can talk through the options.
Composite doors
Draughts round the door leaf usually come from worn seals or adjustment, not the mastic. We seal the frame and let you know about anything else.