Greater London · England
Nag's Head Window Mastic
Professional window mastic in and around Nag's Head, with old sealant always removed completely and a 12-month guarantee.
- Hard, cracked sealant around windows
- White mastic on grey or black frames
- Draughty joints inside around the window
About our window mastic in Nag's Head
A window frame and the wall around it expand and shrink at different rates. Heat and cold make frames grow and shrink against brick or render that hardly moves. So the sealant has to stretch and recover, which is why we use a low-modulus product. If you are dealing with cracked or shrunken mastic around the frame and a bead that doesn’t match the frame, we can put it right.
Many London homes are flats, with windows high above the street. In a converted house or block, the lease usually says who is responsible for the windows, so it’s worth checking before booking.
A one-year guarantee comes with the work, just as it does everywhere we cover.
- Location
- Nag's Head (N7, N19, N4)
- Region
- Greater London
- Guarantee
- One year on every job
- Quote
- A clear price before work begins
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
DIY sealant or a professional job?
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it lifts and traps water and mould underneath. All the old material has to come out first.
FAQs for Nag's Head
Can parking be tricky for a visit in Nag's Head?
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.
Do you work for landlords with property near Drayton Park station?
Yes, landlords and agents are among the people we work for. Just ring 0345 464 0079 or email us with the address and what needs doing, and we’ll give you a clear quote.
Do I need to be at home?
Access is agreed with you when the job is booked. For inside work, that normally means someone being in.
Do you hold any approvals?
Yes. Mr Mastic is an ARBOMaster approved applicator.
What do you put in the joint?
Products from Arbo and Everbuild, among others, chosen to suit the joint. We explain the product when we quote.
Will there be a smell?
It depends on the product. Some products have a noticeable smell, others very little, and any smell fades as they cure.
Do you have insurance?
Yes. We’re fully insured for domestic and commercial work.
Can you do upstairs windows?
Yes, as long as they can be reached safely. Tell us about access when you get in touch and we will plan for it.
Surface by surface
Aluminium frames
Aluminium needs a sealant that bonds to coated metal and we avoid acetoxy silicones, which can react with some metals. Neutral-cure sealant is the safe choice.
Patio & French doors
The joints around patio doors run a long way, top, sides and threshold. The threshold and the bottom corners take the most water, so we pay close attention there.
The process
Our applicators work methodically: protect, prepare, seal, tidy. Typically it takes most of a day for a typical house, less for a few frames, and the area is left clean. In Nag's Head, flats, stairs and shared entrances are part of the routine. If the building has a concierge, managing agent or access rules, tell us when you book.
- First we look at every frame and agree the list.
- Next the failed sealant is cut away and the joint cleaned.
- 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.
Getting ready for the visit
- Keep children and pets away from the work area
- Tell us about access, such as stairs, a lift or high-level joints
- Let us know about parking restrictions
How to get a quote
For window mastic in Nag's Head, call 0345 464 0079 or drop us an email. Tell us what the problem is and where, and we’ll agree the price before any work begins.
Related advice
What happens if it’s left?
A quick bead over the top of old mastic looks like an easy fix, but it will not grip old, dirty sealant. It soon lifts and the leak carries on behind it. The old mastic has to come out. In a flat in Nag's Head, failed sealant seldom stays inside your own four walls: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
We do not show prices on the website, because the cost depends so much on the job itself. For a quick quote, please phone 0345 464 0079 or drop us an email and we will talk you through it.
Why us?
- White, clear, grey or another colour, product permitting
- Anti-fungal silicone where joints get wet
- Homes, businesses and hotels
- We never seal over old sealant
Take a look at what affects the cost and customer reviews.
Quotes for window mastic in Nag's Head
The price is agreed before any work begins. It’s based on:
- Which sealant suits the joint
- Whether the work is at height
- The size of the job
- When we can work, for business premises
Combining jobs into one visit is usually more efficient than separate visits, so it’s worth mentioning everything you’d like done. You’ll get one clear quote for the whole job.
Asking for a quote
There’s no need for technical detail. It helps if you can tell us:
- The address or postcode of the job
- The problem you’ve noticed
- How we’d reach the joints
- Roughly how big the job is
There’s no standard price list, as no two jobs are quite the same. Instead, we give you a clear price for your job. To get started, ring 0345 464 0079 or email us.
Nag's Head homes and the weather
With historic houses such as Witanhurst (about 1.7 miles north-west) nearby, there’s older building stock in the area around Nag's Head as well as newer homes. In older buildings, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic. Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Nag's Head is in London, so parking needs planning: let us know about parking bays, permits or a driveway. Managing a site like Grafton Primary School? Then the mastic around its windows and doors needs looking after like any other building’s. Letting a property close to Drayton Park station? Then cracked frame mastic tends to show up as a draught or damp complaint, so it’s worth checking between lets.
Nag's Head is about 2 miles north-west of Hoxton, in Greater London. Anywhere in N7, we can carry out window mastic at your property. Across Greater London, we cover 764 places, Nag's Head among them.
Postcode districts we cover here for window mastic: N7, N19 and N4. Local streets include Penn Road, Tabley Road and Lowman Road, and we cover them all. Neighbouring places we cover for window mastic include Holloway (1 mile south), Lower Holloway (1 mile south), Tufnell Park (1 mile west), Upper Holloway (1 mile north-west) and Barnsbury (1 mile south). Within a short drive, we also cover London (4 miles south), City of Westminster (3 miles south-west), Marylebone (3 miles south-west), Kensington (5 miles south-west), Shoreditch (3 miles south-east) and Walthamstow (4 miles north-east).
Near you in Nag's Head
We work in homes and buildings around Vaughan Williams Memorial Library, Whittington Park and The Coronet pub. Also close by are Beacon High (0.6 miles south-west) and Musical Theatre Academy (0.8 miles south-east). The closest station to Nag's Head is Drayton Park station, about 0.6 miles south-east. Other landmarks nearby include Arsenal Football Club Museum (under half a mile east) and Royal Northern Hospital (under half a mile north-west). Open spaces near Nag's Head include St. James's Park Lake and Dartmouth Park Hill.
Landlord and commercial work in Nag's Head
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Resealing at the right time is simple maintenance that we can handle for you.
Letting agents and landlords in Nag's Head can book us as well as householders. Resealing between tenancies keeps a property looking cared for.
Keeping the joints in good condition
How long the joints last depends on use and care. We suggest:
- Use gentle cleaners on frames and sealant
- Make sure the drainage slots aren’t blocked
- Wipe condensation off the frames
- Keep timber frames painted
Try not to touch the new joint while it cures, for as long as we advise. Keep jet washers away from the frames.
Water trapped behind a failed joint can start rot in timber frames and sills. Rotten timber needs a joiner, not a sealant, so it pays to reseal before that happens.