Choosing the Right Windows for Your Extension
Windows are more than just glass panes — they’re what connect your extension to light, air, views, and comfort. Whether you’re building in leafy Buckinghamshire or bustling West London, choosing the right windows is a make-or-break design decision.
Let’s break down how to get it right from the start.
1️⃣ Start with Function, Not Just Style
Before you choose frames or finishes, ask yourself:
What do I want these windows to do?
Bring in more daylight?
️ Improve ventilation?
Frame the garden?
Match my existing property?
Think about how you’ll use the room — especially in kitchens or open-plan spaces where airflow and light are key.
Windows above worktops? French doors onto the garden? Think purpose first — then design follows.
2️⃣ Match the Window Style to Your Property Type
Your windows should complement — not clash with — your home’s character:
️ Modern builds – Go bold with slim aluminium frames, large glass panes, and clean lines.
Victorian terraces – Opt for sash-style windows or heritage-friendly timber replicas.
Cottages & bungalows – Casement or traditional wooden styles often suit best.
Don’t just follow trends — align with your property’s identity for timeless curb appeal.
3️⃣ Let Natural Light Be Your Guide ☀️
Great glazing makes a room feel larger, brighter, and more inviting.
✨ Consider:
- Rooflights or lanterns to flood flat roof extensions with sunlight
- Floor-to-ceiling glass to blur the line between inside and out
- Corner glazing for stunning panoramic views
Pro tip: south-facing glass brings in more heat — consider low-E coatings or integrated blinds to prevent overheating.
4️⃣ Choose the Right Glazing for Efficiency & Comfort
The type of glass matters — for temperature, noise, and privacy.
Double glazing – Standard for most builds
Triple glazing – Ideal for colder areas or busy roads
️ Low-E glass – Keeps warmth in and cold out
Acoustic glazing – Reduces external noise
Laminated or toughened glass – Adds security
Ask about U-values — the lower the number, the better the insulation.
5️⃣ Ventilation Is a Must in Functional Rooms
In kitchens, bathrooms, or multi-use spaces, airflow matters.
✅ Top-hung openings
✅ Rooflights with rain sensors
✅ Discreet trickle vents
Fresh air = less condensation, fewer smells, and better wellbeing.
6️⃣ Pick a Frame Material That Works for You
Each frame type has pros and cons. Consider your budget, design style, and maintenance:
- uPVC – Budget-friendly, low upkeep
- Aluminium – Sleek, strong, perfect for minimal frames
- Timber – Classic and warm, though it needs care
- Composite – Best of both (timber inside, aluminium outside)
Balance aesthetics with practicality — especially if you’re aiming for large or bespoke windows.
Why Windows Deserve Early Attention
Too often, windows are an afterthought — but they should be part of the first design discussion. Done right, they:
✔️ Transform the feel of your space
✔️ Save on heating and cooling costs
✔️ Add long-term property value
✔️ Make your extension feel like part of your home — not a bolt-on
️ Why Choose Convert Extend?
We’ve delivered stunning, energy-efficient extensions across West London and Buckinghamshire — and our team knows exactly how to specify windows that work beautifully and perform brilliantly.
✔️ Advice on best glazing options
✔️ Full compliance with building regs
✔️ Bespoke window & door configurations
✔️ Seamless fit with your extension’s structure and design
Let’s create a light-filled, future-proof extension you’ll love.
