Help & advice
How-to guides
Plain-English, step-by-step guides with diagrams for measuring up, fitting your new windows and doors, and keeping them running sweetly for years.
New here? Start with this one
How to use this website
Design a made-to-measure window, set your exact sizes, pick colours and glass, and get an instant price — the whole journey in four minutes.
How to measure
Measure the opening brick-to-brick, deduct 10mm and pick the right cill — five minutes with a tape measure.
5 min read
How to toe & heel a window or door
The packing technique that keeps sashes and doors square — fix a dropped door or re-square a window after glazing.
10 min read
How to install a window
From removing the old frame to the final bead of silicone — level, pack, fix and seal a replacement uPVC window.
15 min read
How to install a door
Fit a uPVC or composite door set: a solid level threshold, packed hinge points and a slab that closes sweetly.
15 min read
Supply-only explained
Exactly what arrives on the lorry, what you arrange yourself, and where responsibility sits on a supply-only order.
6 min read
Building Regulations: Part L, F & K
The three documents that govern replacement windows — heat, ventilation and safety glazing — as buying decisions.
8 min read
FENSA & self-certification
The two routes to getting supply-only windows signed off, and the paperwork your buyer's solicitor will ask for.
6 min read
What to check on delivery
A five-minute tailgate checklist: counting, inspecting glass, storing frames and when to book the fitter.
4 min read
uPVC window costs explained
The five things that drive a window's price, with live from-prices straight from our factory pricing engine.
6 min read
Not confident? Hire a professional installer
These guides are written for competent DIYers. Fitting windows and doors involves heavy glass, working at openings and getting things level, plumb and sealed — if you are unsure at any point, hire a professional installer. In England & Wales, replacement windows and external doors must comply with Building Regulations: an installer registered with a competent-person scheme (such as FENSA or Certass) can self-certify the work, while DIY installations should be notified to your local building control. Glass units and door slabs are heavy — always work with a second person, wear gloves and eye protection, and never let a frame or glass unit take the weight of the wall above.
Questions about your order or fitting? Get in touch — we're happy to talk it through before you start.