If traffic, neighbours or street noise is disrupting your home, soundproofing your windows is one of the most practical upgrades you can make. Most noise enters through glazing, so tackling windows directly gives the biggest return for your effort and budget.
The most effective way to soundproof your windows is to install secondary glazing, which can reduce noise by up to 80% without replacing your existing frames. For the best balance of cost and performance, choose laminated glass secondary glazing fitted with a magnetic seal.
What matters when you choose is your budget, the type of noise you are blocking (traffic versus voices, for example), and whether you own or rent. Secondary glazing is usually the best value for most UK homes, but if you need maximum reduction and have double-glazed frames, acoustic laminated glass replacement may be better. Always check that your window installer is FENSA-registered for any replacement work.
| Option | Typical cost (GBP) | Noise reduction (approx.) | Lifespan |
|---|---|---|---|
| Secondary glazing (magnetic) | £200–£500 per window | 70–80% | 15–20 years |
| Acoustic laminated glass replacement | £400–£800 per window | 60–70% | 20–30 years |
| Heavy curtains + draught seals | £50–£200 per window | 20–40% | 5–10 years |
| DIY window plug | £10–£50 per window | 30–50% | 1–3 years |
| Acoustic caulk | £5–£15 per tube | 10–20% | 5–10 years |
| Triple glazing | £1,000–£2,500 per window | 40–50% | 25–35 years |
| External shutters | £200–£600 per window | 30–40% | 15–25 years |
| Secondary glazing film | £10–£40 per window | 20–30% | 1–3 years |
| Window seal replacement kit | £20–£50 per window | 10–20% | 5–10 years |
| DIY foam or wood plug | £10–£50 per window | 30–50% | 1–3 years |
1. Fit secondary glazing
Secondary glazing is a separate pane installed inside your existing window frame. It creates an air gap that blocks sound effectively. It reduces noise by up to 80% and is the most effective retrofit option for most UK homes. Typical cost is £200–£500 per window (Energy Saving Trust, 2026).
- Does not require planning permission in most cases.
- Can be removed easily if you move home.
- Works with single or double glazing.
2. Replace glass with acoustic laminate
Acoustic laminated glass has a plastic interlayer that dampens sound vibrations. It cuts noise by 60–70% compared to standard double glazing. Costs £400–£800 per window (FENSA, 2026).
- Uses your existing frames, so no structural change.
- Must be installed by a FENSA-registered installer.
- Also improves security and UV protection.
3. Install magnetic secondary glazing
Magnetic secondary glazing uses a magnetic strip to seal the inner pane tightly against the window frame. This creates an airtight barrier that improves noise reduction to 70–80%. Cost is £250–£500 per window (Energy Saving Trust, 2026).
- Easy to fit yourself with no drilling.
- Can be removed in summer for ventilation.
- Thinner profile than hinged secondary glazing.
4. Add heavy curtains and draught seals
Thermal or acoustic curtains block some sound, especially when paired with draught seals around the frame. Together they reduce noise by 20–40%. Draught seals cost £10–£30 per window (Energy Saving Trust, 2026).
- Curtains must be floor-length and thick for best effect.
- Draught seals also cut heating bills.
- Quick and cheap solution for renters.
5. Seal gaps with acoustic caulk
Sound leaks through even tiny gaps around window frames. Acoustic caulk fills these gaps and stops vibration transfer. Cost is £5–£15 per tube (TrustMark, 2026).
- Apply to the perimeter where frame meets wall.
- Stays flexible so it does not crack.
- Works alongside other soundproofing methods.
6. Use a window plug for single windows
A custom-cut foam or wood plug fits snugly into the window recess. It blocks noise by 30–50% for a single window. Cost is £10–£50 (Energy Saving Trust, 2026).
- Best for bedrooms or home offices.
- Removable during the day.
- Must be cut precisely to avoid gaps.
7. Replace with triple glazing
Triple glazing adds a third pane and two air gaps, reducing noise by 40–50% versus standard double glazing. Cost is £1,000–£2,500 per window (FENSA, 2026).
- Best for new builds or full window replacements.
- Also improves thermal insulation significantly.
- Heavier frames may be needed.
8. Fit external shutters
Solid external shutters block noise by 30–40% when closed. They also add security and insulation. Cost is £200–£600 per window (Energy Saving Trust, 2026).
- Must be fitted professionally for weather resistance.
- Can be painted to match your home.
- Not suitable for all window styles.
9. Install a secondary glazing film
Acoustic film sticks directly to the glass and creates a thin air layer. It reduces noise by 20–30% and costs £10–£40 per window (Energy Saving Trust, 2026).
- Cheapest secondary glazing option.
- Can be removed without damaging paint.
- Less effective than rigid secondary glazing.
10. Add a window seal replacement kit
Old rubber seals around opening windows let in sound. Replacing them with new seals reduces noise by 10–20% by stopping drafts. Cost is £20–£50 per window (TrustMark, 2026).
- Simple DIY job with basic tools.
- Also improves energy efficiency.
- Check seal type (brush, rubber, or foam).
For most UK homes, secondary glazing offers the best noise reduction for the cost, especially if you choose a magnetic seal system. If you are replacing windows anyway, acoustic laminated glass or triple glazing give long-term results. How to choose the right window installer Double glazing vs secondary glazing costs Soundproofing a rented home without permanent changes
Frequently Asked Questions
Secondary glazing is the most effective retrofit option, reducing noise by up to 80% without replacing your frames. The Energy Saving Trust (2026) confirms it is the best value for most UK homes.
Costs range from £10 for a DIY window plug to £2,500 for triple glazing per window. Secondary glazing typically costs £200–£500 per window, according to the Energy Saving Trust (2026).
Yes, secondary glazing reduces noise by up to 80% when fitted with a magnetic seal and laminated glass. The Energy Saving Trust (2026) states it is the most effective retrofit noise reduction solution.
Yes, you can add secondary glazing, heavy curtains, draught seals, or DIY window plugs without replacing your frames. Secondary glazing offers the best noise reduction at 70–80%.
DIY window plugs cost £10–£50 per window and reduce noise by 30–50%. Acoustic caulk is even cheaper at £5–£15 per tube but only cuts 10–20% of noise.
