If you’re planning to improve your home’s energy efficiency, security or selling appeal, you may be asking yourself, should I replace my door or windows first? It’s a common question and the answer depends on your property’s condition, budget, and priorities.
I will walk you through the main factors to consider, to help you decide which to replace first, and explain what to expect during the process.
Why Replace Windows or Doors?
Both doors and windows play an important role in insulation, home security, and first impressions. Over time, they can wear down, lose efficiency, or stop meeting modern standards. Replacing either can:
- Improve energy efficiency and reduce heating bills
- Make your home more secure
- Enhance appearance and property value
- Reduce drafts, leaks and outside noise
- Meet current safety and building regulations
But which one should you do first?
Key Signs You Need New Windows
Here are the signs your windows might need replacing:
- Draughts or leaks near the frames
- Condensation between double-glazed panes
- Broken seals or warped frames
- Difficulty opening or closing
- Noticeably cold near the glass in winter
If your UPVC windows in Esher are showing any of these signs, they may be costing you money on energy and making your home less comfortable.
Key Signs You Need a New Door
Common reasons to replace a front or back door include:
- Cold draughts or poor insulation
- Warped or damaged frame
- Rusted or broken locks and handles
- Visible wear, peeling, or fading
- Poor security or lack of multi-point locking
Modern composite doors or aluminium doors can dramatically improve insulation and protection.
Should You Replace the Door or Windows First?
Here’s how to decide what to replace first.
1. Check for Urgency
- Security issues like a weak or damaged door? Replace the door first.
- Energy loss or condensation? Windows may be the main problem.
- If both are in poor condition, replace whichever is worse.
2. Consider Your Budget
Doors are usually cheaper to replace than a full set of windows. If you’re on a limited budget, doing the door first may be easier.
However, replacing windows may offer greater overall energy savings, especially if you have single glazing or outdated frames.
3. Think About Installation Access
If you plan to replace both soon, windows often come first. Installers sometimes use access through doors for window fitting, so doing windows before the door can avoid damaging a new doorframe.
4. Review Your Energy Performance
Upgrading old windows to A-rated glazing has a big impact on energy efficiency. If you’re getting high bills, windows may be the better starting point.
That said, if your front door is letting in a lot of cold air or lacks insulation, it’s worth upgrading first—especially in winter.
Benefits of Replacing Windows First
- Lower energy bills, especially with large or single-glazed windows
- Less draught and condensation
- Higher thermal comfort throughout the home
- Updated look from outside and inside
- Improved ventilation with easy-opening sashes
Many new builds and renovations start with new windows in Cobham for this reason.
Benefits of Replacing Doors First
- Quick insulation improvement with less cost
- Immediate security upgrade with modern locks
- Quick selling appeal boost
- Easier scheduling—takes less time to install than windows
- Less disruption to internal rooms
If your front door is outdated or damaged, start there.
What Do Most Homeowners Do?
In most home upgrades, the general approach is:
- Replace windows first
- Replace external doors second
- Tidy up internal trims and decoration last
This order helps protect new installations and keep things coordinated, especially if your installer is providing matching styles or colours.
Typical Costs for Replacement
Here’s a quick comparison:
| Feature | Average Cost (Supply & Install) | Lifespan |
|---|---|---|
| uPVC Window (per unit) | £500 – £800 | 20–25 years |
| Composite Front Door | £1,200 – £1,800 | 30+ years |
| Aluminium Window (per unit) | £700 – £1,100 | 30+ years |
| French or Patio Doors | £1,000 – £2,000 | 25+ years |
Costs vary based on size, material, and glazing. Always request a clear quote from a FENSA-registered installer and check what’s included.
Consider Matching Designs
If you plan to do both windows and doors in the same year, ask your supplier about matching designs, colours, or frame profiles. This ensures a consistent look and avoids mismatches.
Modern styles like flush fit windows and sleek grey frames are popular in 2025 for contemporary finishes.
Choosing a Trusted Installer
When planning any replacements, choose an installer with:
- FENSA registration
- Local experience in Surrey
- Verified reviews or testimonials
- A clear warranty and installation guarantee
- Energy performance certificates on products
A reputable window supplier in Esher or Surrey window company will offer all of this as standard.
Common FAQs
Q: Can I replace just one window or door?
Yes. If only one is failing or damaged, you can replace it individually.
Q: Do I need planning permission?
Most replacements don’t need planning, but check LABC rules for conservation areas or listed buildings.
Q: How long does it take?
A door installation takes a few hours. A full house of windows may take 2–3 days.
Q: Can I get financial help?
Some councils offer grants for energy-efficient upgrades. It’s worth checking your local authority’s schemes.
Q: Should I wait for summer?
Spring and summer are busier but ideal for faster installs. That said, installers work year-round with weatherproof systems.
Final Advice
Start by reviewing the condition of both your windows and doors. Prioritise urgent issues like security or large heat loss, and make a plan for the other once budget allows. If both need attention, replacing windows first is often more efficient.
Whether you’re focused on performance, comfort or resale value, upgrading to energy-efficient products can make a big difference.
At Skyway Windows, we supply and install A-rated windows and doors across Surrey. If you’re unsure what to upgrade first, we’ll assess your home and offer honest guidance on the most cost-effective improvements. Contact us here for a free quote and advice.
