Oxfordshire · England
Window & door mastic in Crawley, Oxfordshire
We cover Crawley for mastic around window and door frames, sills and patio doors. Old sealant removed completely, joints prepared properly.
- Untidy mastic left by window fitters
- Gaps between the frame and the inside reveal
- Cold air getting in at the frame edge
Window mastic in Crawley
Behind a thin line of old mastic there’s sometimes a deep void. Filling it with sealant alone leaves a joint that cannot move properly, so we fit backing rod to set the right depth. The sealant then grips the two sides it should. We work on uPVC windows, window sills and timber windows & doors, and the jobs we see most are draughty joints inside around the window and white mastic on grey or black frames.
Somewhere as small as Crawley, older homes often have timber frames set in stone or brickwork. Older buildings like these do not always suit modern silicone, and sometimes a traditional sand mastic is the better choice.
We guarantee the work for a year. If something isn’t right with it in that time, tell us and we will put it right.
- Place
- Crawley (OX29)
- Wider area
- Oxfordshire
- Guarantee
- A year, on every job
- Price
- A clear price before we start
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Signs you need window mastic in Crawley
Older frames were often sealed with products that set hard. Once it’s rigid, every bit of frame movement pulls at it, and a gap opens along one edge.
Common reasons people contact us are:
- Old mastic that has gone black or come away
- Draughty joints inside around the window
- Mastic that has split away from the wall
- Gaps left after new windows were fitted
For an older house near a landmark such as Church of St John the Evangelist, the windows may be timber, sash or later replacements, and each needs the right sealant against the wall.
What to look for in a quote
- Whether they seal over old material or remove it
- What the quote includes, VAT included or not
- How hidden problems are handled
- How the surfaces are prepared before sealing
What we do, step by step
Our applicators work methodically: protect, prepare, seal, tidy. For most jobs that takes a morning for a couple of windows and a door, and the area is left clean. For a village or hamlet like Crawley, the journey is planned in advance: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- We check each frame and agree which ones need doing.
- Next the failed sealant is cut away and the joint cleaned.
- Deep gaps are filled with backing rod to set the depth.
- A flexible, weatherproof sealant is applied in a colour to suit the frame.
- Every joint is checked before we leave.
How to prepare
- Clear the area around the work
- Mention any sign-in or site rules at work premises
- Tell us if parking is tricky
Getting a quote
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we will explain how we’d tackle it. Whenever you are ready, phone 0345 464 0079 or email us.
Read more
Leave it or put it right?
Failed mastic is not a reason to replace sound windows. Where the frames are sound, new mastic usually deals with draughts and leaks at the edges. If we find failed glass units or worn seals, we will tell you. Where a wall is exposed, as many are in small places like Crawley, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Commercial jobs are quoted on the same basis as homes: the amount of work, how we reach it and what it needs. Ask us for a quote and we’ll go through it with you.
Why book with us
- We leave the area clean and tidy
- White, clear, grey or another colour, product permitting
- We never seal over old sealant
- A 12-month guarantee on all work
Read our cost guide and what customers say.
What affects the quote in Crawley
Some jobs are bigger than they look, and some smaller. The main factors:
- The old material and how stubborn it is
- Which sealant suits the joint
- The number and length of the joints
- How many areas need sealing
Doing several joints on one visit usually makes better use of the time than several visits, so tell us about everything that needs sealing. We’ll give you a clear quote for the lot.
Helping us quote
To help us quote quickly, let us know:
- Where the property is
- The rough size of the job
- Whether it’s a home or a business
- Pictures of the joints, sent by email
If you’re in Crawley and need window mastic, call 0345 464 0079 or drop us an email. Tell us what the problem is and where, and you’ll get a clear quote before we start.
Towns and villages near Crawley
More services for Crawley
Frames and glazing around Crawley
Historic houses like Minster Lovell Hall (about 1.1 miles west) are a reminder that the area around Crawley has older buildings as well as new. Where a home is older, older timber frames in brick or stone need a different approach from a modern uPVC window. 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.
For landlords with property near Finstock station, renewing tired window mastic between tenants heads off draught and damp complaints. If you look after a building such as Hailey Church of England Primary School, larger buildings have plenty of frames, and the mastic around each one ages.
Crawley is about 1 mile north-west of Witney, in Oxfordshire. Homes, rented property, offices and hotels in Crawley is covered for window mastic. The work is guaranteed for a year. Crawley is one of 443 places in Oxfordshire we cover. For nearby work, see our Oxford page (12 miles or so).
Every address in OX29 is within our area for window mastic. Streets in the area include Witney Hill, Farm Lane and Foxburrow Lane. Nearby, we also carry out window mastic in Leafield (2 miles north-west), Swinbrook (4 miles west), Ascott d'Oyley (4 miles north-west), Ascott-under-Wychwood (5 miles north-west) and Ascott Earl (5 miles north-west). Further out, we also cover Oxford (12 miles east), Abingdon-on-Thames (13 miles south-east), Carterton (5 miles south-west), Wantage (15 miles south), Grove (14 miles south) and Faringdon (11 miles south).
What’s near Crawley
We work in homes and buildings around Wood Green School and The Lamb Inn. Crawley’s nearest station is Finstock station, about 3.6 miles north-east of the centre. Nearby you’ll also find Cogges Manor Farm Museum (1.9 miles south-east). For a walk, there’s Blenheim Farm.
Honest limits
New sealant can’t fix everything, and we’ll tell you before work begins. It will not solve:
- A failed sealed unit that has misted up
- Faulty window hardware
- A frame that has rotted at the joint
If in doubt, call 0345 464 0079 or send us an email and we’ll say what we think.
Where we work in Crawley
- Window sills
- uPVC windows
- Patio & French doors
- Composite doors
- Timber windows & doors
- Aluminium frames
Aftercare tips
After the cure time, these simple habits help:
- Repaint timber before it’s bare
- Don’t paint over the silicone
- Clean frames with a soft cloth and soapy water
- Keep solvents and bleach off the sealant
Silicone can’t generally be painted, so if you’re planning to paint the frames or walls, tell us beforehand. There are paintable sealants for joints that need it.
A small gap around a frame only grows. As old mastic keeps shrinking, the gap widens, and a cold room gets colder. A new joint closes it up.
Surface by surface
Timber windows & doors
Wood swells when it’s wet and shrinks when it dries, so the joint must stay flexible. The paint or stain needs to be sound where the sealant meets it.
uPVC windows
The frame is cleaned with a product that won’t harm the plastic, then the sealant goes in between frame and wall and tooled smooth.
Your questions about window mastic in Crawley
Do you cover smaller places like Crawley?
Yes, we do. Our work covers London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Do you cover Crawley for window mastic?
Yes. Our work covers London and the South East, and Crawley is part of that. Just ring 0345 464 0079 or send us an email with a few details of the job, and we will send you a clear quote.
Do you guarantee window mastic?
Yes. Our one-year guarantee covers every job.
Can you reach windows above the ground floor?
Yes, where they can be reached safely. Tell us about access when you get in touch so we can plan the job.
Do you have insurance?
Yes. We are fully insured, and we can confirm the details when we quote.
What information do you need?
Where the job is, what the problem is and roughly how big it is. If you can, email a few photos.
Can you do several jobs on one visit?
Yes. Tell us about everything you’d like done.
I rent my home. Can I book you?
Of course. Ask your landlord first, and we can send them the quote if that helps.