Best Time to Install Secondary Glazing

    Save 15-25% by choosing the right installation season

    8 min read

    Quick Answer

    Best value: January-February (15-25% off) or October (best weather + 10-15% off)

    Avoid: June-August (peak pricing, longest waits) unless weather is critical

    Seasonal Cost Comparison

    Spring (March-May)5-10% off

    £200-£350 per window

    Standard Pricing

    Advantages

    • • Moderate weather for installation
    • • Installers booking up for summer
    • • Early bird discounts available
    • • Prepare for next winter

    Disadvantages

    • • Increasing demand pushes prices up
    • • Longer lead times as summer approaches
    • • Weather can still be unpredictable

    Expert Recommendation:

    Good time to book for summer installation. Early spring offers best value before peak season.

    Summer (June-August)

    £220-£370 per window

    Peak Pricing

    Advantages

    • • Best weather conditions
    • • Minimal disruption to heating
    • • Longest working hours
    • • Immediate comfort improvement for winter

    Disadvantages

    • • Highest prices (10-15% premium)
    • • Longest wait times (4-8 weeks)
    • • Most competitive booking period
    • • Holiday season delays possible

    Expert Recommendation:

    Book in spring for summer installation. Avoid late summer bookings which may delay into autumn.

    Autumn (September-November)10-15% off

    £180-£320 per window

    Falling Prices

    Advantages

    • • Prices dropping as demand falls
    • • Shorter wait times (2-4 weeks)
    • • Still good installation weather
    • • Install before winter cold sets in

    Disadvantages

    • • Weather becoming less predictable
    • • Daylight hours shortening
    • • Rush to complete before winter
    • • Late autumn can be very wet

    Expert Recommendation:

    Excellent value window. September-October ideal for balancing price and weather. Book early November for pre-Christmas installation.

    Winter (December-February)15-25% off

    £150-£280 per window

    Lowest Pricing

    Advantages

    • • Lowest prices of the year
    • • Immediate availability
    • • Installers eager for work
    • • Maximum negotiating power

    Disadvantages

    • • Cold during installation (house open)
    • • Shorter daylight hours
    • • Weather delays possible
    • • Condensation issues during install
    • • Holiday period disruptions (late Dec)

    Expert Recommendation:

    Best prices but prepare for cold during installation. January-February ideal if you can handle short-term discomfort.

    Month-by-Month Guide

    January
    Lowest
    Best bargains of the year. Installers keen for work.
    February
    Lowest
    Excellent value. Weather improving as month progresses.
    March
    Good
    Prices rising. Book now for April-May installation.
    April
    Good
    Last chance for spring discounts. Book for May-June.
    May
    Fair
    Demand increasing. Book 6-8 weeks ahead.
    June
    High
    Peak season begins. Expect premium pricing.
    July
    Highest
    Most expensive month. 8-10 week wait times.
    August
    High
    Still expensive. Holiday delays common.
    September
    Good
    Prices falling. Good availability returns.
    October
    Very Good
    Sweet spot: good weather, falling prices, short waits.
    November
    Good
    Bargains available. Book for pre-Christmas install.
    December
    Low
    Low prices but holiday disruptions. Avoid mid-month.

    Price Fluctuation Examples

    Standard 3-Window Project

    Winter (Jan-Feb)£450-£840
    Spring (Mar-May)£600-£1,050
    Summer (Jun-Aug)£660-£1,110
    Autumn (Sep-Nov)£540-£960

    Potential savings: Up to £210 by choosing winter over summer

    Whole House (8 windows)

    Winter (Jan-Feb)£1,200-£2,240
    Spring (Mar-May)£1,600-£2,800
    Summer (Jun-Aug)£1,760-£2,960
    Autumn (Sep-Nov)£1,440-£2,560

    Potential savings: Up to £720 by choosing winter over summer

    Expert Booking Strategy

    For Maximum Savings (15-25% off)

    Book January-February installation. Accept short-term cold during fitting. Ideal if budget is priority and you can handle 1-2 days of disruption.

    For Best Overall Value (10-15% off + good weather)

    Book September-October installation. Perfect balance of savings, good weather, and short wait times. Most recommended by installers.

    For Convenience (despite higher cost)

    Book in spring (March-April) for summer installation. Locks in installers before peak demand. Accept 10-15% premium for perfect installation conditions.

    To Avoid

    Last-minute bookings in June-July result in highest prices, longest waits (8-10 weeks), and risk of delays. Plan ahead to avoid peak season premium.

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