, sizes, radiator, damp and safety checks before you build.){kind=link}
The best window seat ideas with storage use the space under the seat for a lift-up lid, drawers or open cubbies. A lift-up lid holds the most. Drawers are easier for everyday items. Open cubbies suit kids’ toys and books. In the UK, a ready-made storage bench starts at about £149, and a fitted bay window seat typically costs £600 to £3,200.
This guide gives you 18 ideas by room. It then covers costs, sizes, radiators, damp and the safety checks UK homes need. Prices and listings were checked on 13 October 2026.
How this guide was researched: it is based on published prices, product listings and official guidance. We have not built or tested any of the seats or products mentioned, and there are no affiliate links.
In this guide
- Storage styles at a glance
- Lid, drawers, doors or cubbies?
- 18 window seat ideas with storage
- How much does it cost?
- What size should it be?
- Radiators
- Condensation and damp
- Safety and building regulations
- Renters
- Cushions and fabrics
- Mistakes and checklist
- FAQs
Window seat storage styles at a glance
| Style | How the storage works | Cost cue | Best for |
|---|---|---|---|
| Lift-up lid | Hinged seat over one large space | Fitted seats with storage: £1,700 to £2,800+ | Blankets, bedding, seasonal items |
| Drawers | Pull-out boxes in the front | More complex to build, so they tend to cost more than a lid | Everyday items |
| Open cubbies or baskets | Open compartments under or beside the seat | Varies with the build | Toys, books, kids’ rooms |
| Ready-made storage bench | Freestanding bench with a lift-up top | From about £149 (B&Q example) | Renters, quick fixes |
| Flat-pack hack | Cabinets or units with a padded top | UK prices not confirmed | Confident DIY-ers |
Lid, drawers, doors or cubbies: which storage is best?
The most popular type is the ottoman style, with a lid hidden under the seat cushion. It gives you the most space. The downside is that you have to take the cushion off every time you open it, which gets annoying for things you use often.
If you have space in front of the seat, drawers are easier. Push-click drawers keep the clean look of a lidded seat but are quicker to open. Doors and open cubbies sit in between: easy to reach, and good with baskets.
Simple side views for illustration only. Not to scale.
What will you store?
| You want to store | Best choice |
|---|---|
| Blankets, bedding, spare towels | Lift-up lid |
| Things you use daily | Drawers |
| Kids’ toys and books | Open cubbies, baskets or drawers |
| Shoes, bags | Drawers or open shoe storage |
| Books and ornaments | Shelves beside the seat |
18 window seat ideas with storage
Window seats suit UK homes because space is tight. The average home in England has about 94 m² of usable floor space, and homes in London about 84 m² (English Housing Survey 2018 to 2019). A seat that doubles as storage uses space you already have.
Average usable floor area, England (m²)
Source: English Housing Survey 2018 to 2019, Size of English Homes fact sheet.
Living room and bay window ideas
1. Bay window seat with a lift-up lid
A built-in seat fills a bay from edge to edge, so there are no awkward gaps. A hinged lid under the cushion gives the biggest hidden space, which suits blankets, bedding and seasonal items. The catch is that you lift the cushion each time, so keep daily items elsewhere. MyBuilder puts fitted seats with storage at £1,700 to £2,800 or more.
Labels: Built-in, Bespoke or DIY
2. Bay window seat with deep drawers
Drawers make the contents easier to reach, because you do not have to lift a cushion. Push-click catches give a clean front with no handles. You need floor space in front for the drawers to open, and drawers are more complex to build than a lid, so they tend to cost more.
Labels: Built-in, Bespoke
3. Curved or bow window bench
A bench that follows the curve of a bow window looks as if it was always part of the house. MyBuilder says a basic curved seat can start around £350 for materials and labour, but custom work can pass £1,700. Its own figures overlap with its other tiers, so get at least two quotes.
Labels: Bespoke
4. Alcove seat between shelves or bookcases
In an alcove or deep window recess, build the seat between shelves or bookcases. You get storage under the seat and your books beside you. Our reading corner ideas show how to style the space. You need enough depth for a comfortable seat.
Labels: Built-in, DIY-friendly
5. Extra-deep seat that doubles as a day bed
If the recess or bay is deep, the seat can double as a day bed with drawers underneath. Measure carefully, because a deep seat can crowd a room. Our small living room ideas help you check the layout first.
Labels: Built-in, Bespoke
Bedroom ideas
6. Bedroom seat with blanket and linen storage
A bedroom seat gives you somewhere to sit and put on shoes, plus storage for linen, blankets and off-season clothes. On a first floor, check the escape window rules in the safety section before you fix anything in front of the window. For more ideas, see our small bedroom ideas and tiny bedroom storage ideas.
Labels: Built-in or Freestanding, Escape window check
Kids’ room ideas
7. Seat with toy cubbies
Open cubbies or baskets under the seat let children reach toys and books themselves, with no heavy lid. Add a soft cushion on top. For more ways to organise a child’s room, see our kids’ room storage ideas.
Labels: Built-in, DIY-friendly, Kids: lid safety
8. Reading zone with a slim shelf and deep drawers
A slim shelf beside the seat and deep drawers underneath make a reading zone with room for toys. Ideal Home shows a seat deep enough to take a child’s mattress for sleepovers. Check your depth before you plan this.
Labels: Built-in, Bespoke
Kitchen and dining ideas
9. Kitchen banquette window seat
A straight or L-shaped seat by the window seats more people than chairs, and you can still pull up an extra chair. The space below can hold cookbooks and lesser-used kitchen items. Choose a wipeable fabric for spills. Our breakfast nook ideas for small kitchens help with layout.
Labels: Built-in
10. Seat between kitchen-style base units
Fit base units either side of the window and place the seat between them. You get cupboard storage beside you as well as under the seat. Ask your fitter whether standard units can be used and how the plinth and trim will be finished.
Labels: Built-in, Flat-pack hack possible
Hallway, landing and bathroom ideas
11. Hallway seat with shoe storage
A hallway seat with deep drawers or open shoe storage keeps coats, bags and shoes tidy where you need them. It works under a hall window. See our hallway decorating ideas for styling, and our landing decor ideas if the window is upstairs. On an upstairs landing, read the falls guidance below first.
Labels: Built-in or Freestanding
12. Bathroom seat with a hinged lid for towels
In a bathroom alcove, a seat with a hinged top gives you somewhere to sit and room for towels. Use moisture-resistant materials and a paint made for bathrooms. More ideas are in our bathroom storage ideas.
Labels: Built-in
Loft and conservatory ideas
13. Dormer or attic seat using eaves space
The low space under a sloping ceiling is hard to use for anything else. A long seat with drawers or doors fills it and can hold bedding or luggage. Low windows in loft rooms need extra care, so read the falls section below. Our loft conversion ideas show more ways to use the space.
Labels: Built-in, Bespoke
14. Conservatory seat with storage
A storage seat works well in a conservatory, but strong sun can overheat the space. Homebuilding advises avoiding south-facing spots where you can, and using solar control glass on large glazed areas. Pair the seat with other conservatory furniture ideas.
Labels: Freestanding or Built-in
Budget and renter-friendly ideas
15. Ready-made storage ottoman under the window
A storage ottoman or blanket box under the window is the quickest option, and the easiest for renters. One B&Q example costs £149, measures 1210 × 455 × 670 mm and holds 72.27 litres. It is sold online only, so check stock and price. Our rental home decor ideas cover more renter-friendly changes.
Labels: Freestanding, Budget
16. Simple bench with baskets underneath
A plain bench with baskets underneath is slim, so it suits small rooms. You get less storage than a box seat, but it is light and easy to move. Our space-saving furniture ideas have similar options.
Labels: Freestanding, Budget
17. Flat-pack hack with an upholstered top
Some DIY builders make seats from kitchen or storage units with a padded top. We could not confirm UK prices or current ranges, so check the units you plan to use and how the plinth and trim will look. Our budget home decor ideas show other low-cost changes.
Labels: Flat-pack hack, DIY-friendly
Seat around a radiator
18. Window seat around a radiator
Many UK windows have a radiator beneath them. You can build a seat around it, but covering a radiator cuts how well it heats the room. Read the radiator section below before you commit.
Labels: Built-in, Radiator check
How much does a window seat with storage cost in the UK?
A fitted bay window seat typically costs £600 to £3,200 in the UK, according to MyBuilder’s price guide (updated 21 August 2026). Basic builds start at £600, mid-range ones run from £1,700 to £2,800, and high-end work can go past £3,200.
Bay window seat cost by tier (£)
Bars run on a scale of £0 to £3,500. Source: MyBuilder, updated 21 August 2026.
The style of seat changes the price. Storage and cantilevered seats cost the most, because they take more work or need extra support.
Cost by style (£)
Bars run on a scale of £0 to £3,500. Source: MyBuilder, updated 21 August 2026. Its curved and basic figures overlap, so treat them as a guide and get quotes.
DIY, flat-pack, ready-made or fitted: costs compared
| Route | Cost | Notes |
|---|---|---|
| DIY | Total not confirmed | Use the materials prices below to work out your own build |
| Flat-pack hack | UK prices not confirmed | Check unit prices, plinth and trim costs |
| Ready-made bench | About £149 (B&Q example) | Online only; check stock and price |
| Fitted by a carpenter | £600 to £3,200+ | Depends on design, size and finish |
Materials and labour
| Item | Typical cost |
|---|---|
| MDF board | £25 to £40 per sheet |
| Hardwood (such as oak or ash) | £40 to £100 per board |
| Upholstery fabric | £15 to £50 per metre |
| Foam cushioning | £10 to £30 per piece |
| Carpenter or joiner | £25 to £40 per hour, or £150 to £300 per day |
| Total labour for a bay seat | £500 to £1,200 |
Extras that catch people out
- Moving a radiator: £200 to £300, and more if the job is complex
- A new power socket: £100 to £200 each
- Custom upholstery: £200 to £600 on top
To keep costs down, choose a simpler design, use MDF instead of hardwood, paint it yourself, or consider a prefabricated seat. For more ways to save, see our budget home decor ideas.
What size should a window seat with storage be?
We could not find an official UK standard for seat height or depth, so the safest rule is to measure your own window. The figures below are real examples to give you a starting point, not rules.
| Example | Size | Source |
|---|---|---|
| Ready-made storage bench (B&Q) | 1210 mm wide × 455 mm deep × 670 mm high, including arms | B&Q listing |
| Ready-made window seat (GFW Verona) | Seat height 40 cm, depth 41 cm, width 107 cm | Retailer listing |
| Antique UK window seats | Seat heights of about 42 to 51 cm | UK dealer listings |
| Cushion thickness, slim dormer seat | 50 mm | eFoam |
| Cushion thickness, hard base | 75 to 100 mm | eFoam |
Simple side view for illustration only. Not to scale.
How to measure
- Measure from the floor to the sill. The seat and cushion must sit below it.
- Measure the depth of the recess or bay at its narrowest point.
- Decide the cushion thickness first, then subtract it from the height.
- In a bay, measure each panel separately, because few UK bays are perfectly even.
- Leave enough room for drawers to open fully, and for the window handles to work.
Ideal Home advises being meticulous with measurements, because the seat cushion should slot in neatly under the window ledge.
Storage capacity of ready-made window seats (litres)
Bars run on a scale of 0 to 100 litres. Capacities as listed by retailers on 13 October 2026. Check each listing for current stock and specifications.
Can you put a window seat over a radiator?
Yes, but covering a radiator reduces how well it heats the room. Homebuilding warns that heavy, floor-length curtains block the heat from entering the room, and furniture does the same. A UK boiler advice site, Heatable, also says obstructing a radiator limits its capacity to heat and suggests asking a qualified heating engineer if you are unsure.
We could not find a reliable percentage for heat lost, so we have not included one. Ask your engineer these questions before you build:
- Can the radiator be moved? MyBuilder puts this at £200 to £300.
- Will a vented front or gaps at the top and bottom be enough?
- Are the pipes and valves still easy to reach for servicing?
- Is any wiring close to the radiator?
More on this topic: Homebuilding’s guide to radiators under windows.
Will a window seat cause damp or condensation?
Not on its own. But condensation forms where warm, moist air meets a cold surface and there is little airflow, and the space inside a closed seat against an external wall can fit that description. MyBuilder also notes that without insulation, the seat area can be draughty.
UK council damp advice suggests cutting ventilation slots in the backs of shelves or using slatted shelves, and keeping furniture about 50 mm away from external walls where you can. The same ideas apply to a window seat. Do not seal the room tight if you already have condensation.
- Add ventilation slots or slatted panels to the back of the storage space.
- Leave a small gap between the seat and an external wall where you can.
- Do not store damp items, such as wet towels, inside.
- Keep the room ventilated and wipe condensation from the window.
If you already see mould, find the cause before you build. Our guide on how to stop mould in a bedroom explains the first steps.
Are window seats safe? Falls, escape windows and children
These checks are for England. Rules differ in Scotland and Wales, so check your own building standards there.
Falls from upstairs windows
The government’s Approved Document K covers protection from falling. A 2024 Ministry of Housing response said window limiters should be considered where someone could fall from a window above ground level. A seat raises where a child can sit or climb, so fit window restrictors on upstairs windows, and ask Building Control if you are unsure. This is our caution, not a rule that says a seat must have one.
Bedroom escape windows
First-floor bedrooms need an escape window in case of fire. Council building control guidance sets these sizes:
| Requirement | Size |
|---|---|
| Unobstructed openable area | At least 0.33 m² |
| Minimum height and width | 450 mm each (a 450 mm wide opening needs to be at least 733 mm high) |
| Bottom of the opening | No more than 1100 mm above the floor (some councils also give a minimum of 800 mm) |
We could not confirm how a fixed seat or lid in front of an escape window is treated. Check with Building Control before fixing a seat in front of a bedroom escape window.
Children and heavy lids
We found no UK rule for lift-up seats, so this is general advice from child-safety bodies in Australia and the US, not UK law. They advise lid supports that stop a lid dropping, no latches, and ventilation or a gap so a trapped child can breathe. For young children, drawers or open cubbies avoid the problem completely.
Weight
Test the seat with an adult’s weight before you sit comfortably, as Ideal Home advises. One ready-made seat we checked lists a load capacity of 110 kg, so check the figure for any seat you buy.
Can renters have a window seat with storage?
Yes, with a freestanding storage bench or blanket box that does not fix to the walls or window. For anything fixed, such as shelves or a built-in seat, get your landlord’s permission in writing first. Hackney Council advises written permission before permanent changes. We could not confirm whether freestanding and fixed items are treated differently, so ask your landlord. See our rental home decor ideas for more.
How to choose a window seat cushion
For everyday sitting, use a firm, high-density foam. UK foam supplier eFoam recommends high-firm foam where the seat doubles as family seating, and a medium grade for back cushions or lighter use. A memory foam topper is optional for a reading nook.
- Thickness: about 50 mm on a slim seat, and 75 to 100 mm on a hard base.
- Shape: bay windows need cushions cut to each panel’s angle.
- Fabric: choose wipeable or washable covers if you have kids or pets. Our pet-friendly furniture ideas give more advice.
- Fire safety: eFoam states its upholstery foams meet the Furniture and Furnishings (Fire) (Safety) Regulations 1988.
Common mistakes and a quick checklist
Mistakes to avoid
- Building over a radiator without checking heat output.
- Sealing the storage space with no ventilation.
- Fitting a heavy lid with no support in a child’s room.
- Blocking a first-floor bedroom escape window.
- Choosing soft foam for a seat you will use every day.
- Measuring only once, or only one point of a bay.
Checklist before you build or buy
| Check | Question to answer |
|---|---|
| Measure | Floor to sill, recess depth, each bay panel |
| Storage use | What will go inside, and how often will you reach for it? |
| Radiator | Is one under the window? Move it, or keep it clear? |
| Budget route | DIY, flat-pack, ready-made or fitted? |
| Safety | Restrictors upstairs, escape window clear, lid supports for kids |
| Ventilation | Slots or slats in the storage space |
| Cushion | Foam grade, thickness and a wipeable cover |
If you also need more storage elsewhere, our living room storage ideas are a good next step.
Window seat with storage FAQs
How much does a window seat with storage cost in the UK?
A fitted bay window seat typically costs £600 to £3,200, based on MyBuilder’s guide updated 21 August 2026. Seats with built-in storage run from about £1,700 to £2,800 or more. A ready-made storage bench can cost about £149. DIY costs depend on materials, and MDF is about £25 to £40 per sheet.
How deep should a window seat be?
We could not confirm a UK standard. The ready-made seats we checked are about 41 to 46 cm deep. For a built-in seat, the depth is set by your recess or bay, with the cushion sitting below the sill, so measure your own space first.
How high should a window seat be?
No UK standard was confirmed. One ready-made seat lists a seat height of 40 cm, and the antique UK window seats we checked have seat heights of about 42 to 51 cm. Measure from the floor to the sill, allow for the cushion, and make sure the window handles still work.
What can you store in a window seat?
Blankets, bedding, towels, off-season clothes, toys, books and shoes, depending on the storage type. Lift-up lids suit bulky soft items. Drawers suit everyday things. Open cubbies and baskets suit toys and books. Avoid putting items you need daily under a lid with a cushion on top.
Is a lift-up lid or drawers better?
A lift-up lid gives the most hidden space and is the most popular style, but you must lift the cushion to reach your things. Drawers are easier for everyday items and can use push-click opening. They need space in front and are more complex to build, so they tend to cost more.
Can you put a window seat over a radiator?
Yes, but covering a radiator reduces how well it heats the room. Heavy curtains and furniture block heat the same way. Ask a heating engineer about moving the radiator, which MyBuilder puts at £200 to £300, or about a vented design. Keep wiring away from the radiator.
Do window seats cause damp?
Not on their own, but a closed, cold space against an external wall can trap moisture and attract condensation. Add ventilation slots or slatted panels, leave a gap from external walls where you can, and keep the room ventilated. If you see mould, find the cause first.
Do you need building regulations approval for a window seat?
We could not confirm planning or building regulation rules for window seats from official sources. Check with Building Control if you alter the structure, block a first-floor bedroom escape window, or change guarding at a low window. Rules differ in Scotland and Wales.
Can I build a window seat myself?
Yes, if you are comfortable with basic carpentry. A simple box with a hinged lid, or a bench over ready-made units, is the easiest route. Use proper lid supports, test the seat with adult weight, and add ventilation. Pull-out drawers are more complex. A ready-made bench needs no building.
Can renters have a window seat with storage?
Yes, with a freestanding storage bench or blanket box that does not fix to walls or windows. For anything fixed, such as shelves or a built-in seat, get your landlord’s permission in writing first. Hackney Council advises written permission before making permanent changes.
Which window seat with storage should you choose?
If you rent, buy a freestanding storage bench. If you have a period bay, a fitted seat with a lid or drawers uses the space best. If you have young children, choose drawers or open cubbies over a heavy lid. Whatever you choose, measure your window, check the radiator, add ventilation and keep any bedroom escape window clear.
Sources
- MyBuilder: How Much Does a Bay Window Seat Cost? (updated 21 August 2026)
- B&Q: GFW Pettine Ottoman Storage Bench (checked 13 October 2026)
- Ideal Home: Window seat ideas
- Homebuilding: Window seat ideas
- Homebuilding: Radiators under windows
- Heatable: Radiator under a window
- GOV.UK: Approved Document K
- Ministry of Housing response on protection from falling (2024)
- Richmond Council: window replacement and means of escape
- CNC Building Control: Escape windows guide
- Hackney Council: private tenant help
- eFoam: Window seat cushions
- English Housing Survey 2018 to 2019: Size of English Homes