Surrey · England

Window & door mastic in Guildford, Surrey

Window mastic in Guildford from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.

  • Mastic that has split away from the wall
  • Water coming in at the bottom corners of a door
  • Gaps left after new windows were fitted

Window mastic near Guildford

Window mastic for homes and businesses in Guildford

Frames and walls do not move together. Plastic and aluminium frames move with the temperature, while masonry stays fairly still. So the sealant has to stretch and recover, which is why we use a low-modulus product. We work on timber windows & doors, uPVC windows and composite doors, and common reasons people get in touch are damp patches on the reveal after heavy rain and draughty joints inside around the window.

A place the size of Guildford has every kind of window, from older timber frames to uPVC and aluminium in newer homes, plus conservatories, patio doors and rooflights. Each needs the right sealant, and each joint wears out eventually.

Every job is covered by our 12-month guarantee, wherever you are in Surrey.

Applicator reaching up to seal an external door frame on a sunny day
Where
Guildford (GU1, GU2, GU4, GU3)
Region
Surrey
Cover
One year on every job
Price
A clear quote up front
Telephone
0345 464 0079
Last updated
26 October 2026

For landlords and businesses

Hotels need rooms back in use, so we plan the work room by room. Hotel work is part of what we do, alongside homes and businesses.

For anyone letting property in or around Guildford, jobs at different addresses can go on one quote. Just tell us the addresses and what each one needs, and photos by email help.

Leave it or put it right?

A cracked joint around a frame lets rain into the wall. Over time that can mean damp patches, damaged plaster and rotting timber. Resealing now is a small job by comparison. In a large rental market like Guildford, tired sealant leads to tenant complaints about mould, damp and leaks. Sorting it between tenancies is easier than dealing with it mid-let.

Rather than a set price list, we price the job in front of us: the amount of work, the old material and the access. You will know the price before we begin.

Why choose Mr Mastic in Guildford

  • Quality sealants from Arbo and Everbuild
  • White, clear, grey or coloured to suit, where the product allows
  • More than 20 years in sealant work
  • Colour agreed with you before work begins

Read our cost guide or customer reviews.

When it isn’t the sealant

Some problems need a builder, plumber or other trade rather than us:

  • Faulty window hardware
  • A frame that has rotted at the joint
  • Worn gaskets, brush seals or a door that has dropped

If in doubt, ring 0345 464 0079 or email us and we will say what we think.

Surfaces we seal

  • uPVC windows
  • Timber windows & doors
  • Patio & French doors
  • Composite doors
  • Window sills
  • Aluminium frames

Common problems we fix in Guildford

Sills take more water than any other part of a window, and the ends of the sill, where it meets the wall, are where it gets in. When that sealant fails, water gets into the wall or under the frame.

These are the problems we’re asked about most:

  • Sealant in the wrong colour for the frame
  • Damp patches on the reveal after heavy rain
  • Rushed sealant from a window installation
  • Cracked internal joints between frame and plaster

If you look after a building such as Sandfield Primary School, the mastic around its windows and doors needs looking after like any other building’s.

What your quote should include

  • Who turns up on the day
  • Are they insured?
  • Whether you can choose the colour
  • What happens if the job turns out different

How to choose a mastic man

Window mastic in Guildford: local notes

London and the South East are among the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. With historic houses such as Guildford Castle (about 0.9 miles south) nearby, there’s older building stock in the area around Guildford as well as newer homes. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.

Rented homes near London Road (Guildford) station change hands often, and renewing tired window mastic between tenants heads off draught and damp complaints. For an older house near a landmark such as Church of St John the Evangelist, frames set in older brick or stone need a sealant that suits the wall as well as the frame.

Guildford is about 27 miles south-west of London, in Surrey. From the centre of Guildford to the outskirts, we cover window mastic for every kind of property, from flats and houses to offices and hotels. Guildford is one of 395 places in Surrey we cover. For nearby work, see our Crawley page.

Jobs for window mastic in GU1, GU2, GU4 and GU3 is quoted and booked the same way as anywhere else. You’ll find streets such as Church Road, Market Street and High Street. You will find Guildford on the A3 and A25, which makes it straightforward to reach. We also cover the places around Guildford: Bellfields (1 mile north), Abbotswood (1 mile south-east), Stoughton (1 mile north-west), Westborough (1 mile west) and Burpham (1 mile north-east). Larger places within reach include Woking (5 miles north), Camberley (9 miles north-west), Epsom (15 miles north-east), Farnham (10 miles west), Egham (13 miles north) and Walton-on-Thames (12 miles north-east). Guildford is among the bigger towns we cover in Surrey.

Local landmarks in Guildford

Locally, jobs take us to homes and businesses close to The King's Head pub, Guildford High School and Surrey Maths School, among other places. For rail, the closest station is London Road (Guildford) station, roughly 0.6 miles south-east. Well-known places in the area include Guildford Castle (0.9 miles south) and Guildford House (0.8 miles south). Not far away are Silent Pool and Pewley Hill.

Map of Guildford © OpenStreetMap contributors

How to look after the new joints

After the cure time, these simple habits help:

  • Keep paint off silicone joints
  • Avoid blasting the frames with a pressure washer
  • Make sure the drainage slots aren’t blocked
  • Use gentle cleaners on frames and sealant

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.

Guildford questions

Is window mastic in Guildford guaranteed?

All our work, in Guildford and everywhere else, comes with a 12-month guarantee. We are also fully insured and ARBOMaster approved.

Is Guildford in your area for window mastic?

Yes, Guildford is within the area we cover. Our work covers London and the South East. You can phone 0345 464 0079 or send us an email and let us know what needs doing, and we will give you a clear quote.

Can you do upstairs windows?

Yes, in most cases. Access is planned before work begins, so mention the height and anything in the way.

Are you an approved applicator?

Yes. We are approved under the ARBOMaster scheme, which is run for the Arbo sealant brand.

How many windows can you do in a day?

A few frames take a few hours, while a whole house takes longer. You will get a timescale with the quote.

I rent my home. Can I book you?

Yes, though it’s best to check with your landlord first. Many landlords are glad to have it sorted.

Do you seal inside as well as outside?

Yes, we do both. Indoors, we seal between the frame and the plaster or reveal.

Can new window sealant be painted?

Most silicone can’t be painted. Let us know beforehand, and we will use a paintable product where it suits.

What we do, step by step

We work through the job in order: protect, prepare, seal, tidy. Typically it takes most of a day for a typical house, less for a few frames and we leave things clean and tidy. Jobs in a place the size of Guildford range from town-centre flats to offices and family homes. For each, it helps to know about access, parking and where the joints are.

  1. First we look at every frame and agree the list.
  2. Next the failed sealant is cut away and the joint cleaned.
  3. Where gaps are deep, backing rod goes in first.
  4. We apply a weatherproof sealant to match the frame and tool it neatly.
  5. Finally we tidy up and check each joint.

Getting ready for the visit

  • Keep pets and children clear of the area while we work
  • Tell us about any water getting in
  • Mention if the joints have been sealed before

How to get a quote

For a quote, call 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. You’ll have a clear quote before any work starts.

Ask for a quote

Advice

DIY versus a professional finish

If you’ve already had a go yourself, that’s fine. We cut it out and start again, so tell us about it when you ask for a quote.

Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.

20+ yearsMastic and sealant specialists
ARBOMaster approvedApproved applicator for Arbo sealants
Fully insuredDomestic, commercial and hotels
One-year guaranteeOn every job