✅ Looking to replace your windows without overspending? Replacing windows is a big investment, but smart homeowners are cutting costs by sourcing their own materials or installing them DIY.
💡 Did you know?🏠 Sourcing your own windows can reduce markups by 20-30%.🔨 DIY installation can save £150-£300 per window in labour costs.🛠️ Hiring a fitter for installation only means you pay for expertise, not inflated material prices.
This guide breaks down how to install uPVC windows step by step—whether you’re a DIY pro or hiring a tradesperson.
🛠️ Planning Your Installation – Avoid Costly Mistakes!
Before you remove your old windows, double-check your new ones!
📏 Measure Twice, Fit Once – Ensure the correct size, sill depth, and opening direction.
🔩 Leave a 5mm expansion gap – This prevents warping and ensures a secure fit.
🛠️ Check the installation area – Remove debris and ensure a clean work area.
💡 Pro Tip: A poorly measured window can lead to expensive adjustments or drafts—get it right the first time!
🛠️ Step-by-Step Guide On How To Install uPVC Windows
Follow these steps to install your new uPVC windows like a pro.
Step 1: Remove the Old Window
✔ Score the edges with a sharp blade to avoid damaging plaster.✔ Remove the glass first to reduce weight.✔ Break the old sealant and carefully detach the frame.
Step 2: Prepare the New Window for Installation
✔ If the old mortar bed is stable, keep it. Otherwise, remove and smooth the surface.✔ Attach the external sill to the frame using screws.✔ Seal the sill and frame ends to prevent moisture tracking.
Step 3: Position & Secure the Window Frame
✔ Place the frame into position, ensuring a 5mm gap around all edges.✔ Use packers to level the frame.✔ Drill fixing holes 150mm from corners and 600mm apart.✔ Secure with frame fixings and avoid overtightening.
🔹 Windy location? Secure the top & bottom of the frame to prevent movement.
Step 4: Fit the Glass & Secure the Beading
✔ Use glazing packers to centralize the glass.✔ For side-hinged windows, use toe & heeling to keep the frame square.✔ Tap beading into place with a nylon mallet—install horizontal beads first.
Step 5: Internal Trims & Sealing
✔ Clean the frame and surrounding area for good adhesion.✔ Secure trims with PVC adhesive or silicone.✔ Seal gaps with acrylic caulk for a professional look.
Step 6: External Sealing & Final Touches
✔ Apply masking tape for a neat seal.✔ Run a smooth bead of silicone around the frame.✔ Check for water resistance by sealing below the sill.
✅ Done! Now step back and admire your newly installed, money-saving uPVC windows!
How Much Can You Save?
💰 DIY Window Installation vs. Hiring a Professional
Hiring a professional can cost between £150-£300 per window, plus labour fees.
Sourcing your own windows can help reduce markups on materials.
For those comfortable with DIY installation, the savings can be even greater.
Want a hybrid approach? Order windows yourself and hire a fitter—cutting material markups while keeping expert fitting.
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