Buying guide

Curtain Linings Explained: Blackout vs Thermal vs Sateen

Q: What Is the Difference Between Blackout, Thermal, and Sateen Options?

The blackout option is for stronger light control, thermal for insulation and warmth, and sateen for a neat finish where specialist darkness or insulation is not the priority.

Q: Which Lining Works Best for Bedrooms, Cold Rooms, and Living Spaces?

Choose blackout for bedrooms, nurseries, and media rooms when light reduction is the main priority, because blackout construction is designed to reduce intrusive light more than a standard lining.

Q: Which Curtain Lining Should You Choose Before You Order?

The best fit depends on the main need: choose blackout for stronger light control, thermal for warmth or draught comfort, and sateen for a lighter standard finish when extra darkness or insulation is not needed.

Choose between blackout, thermal and sateen curtain linings with practical room-by-room guidance for made-to-measure curtains.

British Made Interiors21 July 2026

Choose blackout when light control matters most, especially for bedrooms or media rooms; choose thermal for cold, draughty or heat-loss rooms; choose sateen when a lighter standard lining and neat fabric finish are enough.

Key Takeaways: Blackout, Thermal, or Sateen Curtain Lining

Blackout lining is the best fit when reducing light is the main job, such as in a bedroom, nursery or media room.
Thermal lining is the better fit for rooms that feel cold, lose heat at the window or need more comfort in winter. Groundwork says a high-quality set of thermal curtains costs around £90-£100^[1], so the extra spend should solve a real room problem.
Sateen lining is the lighter standard choice when you want a neat backing and do not need extra darkness or insulation.
Decide the room need before choosing samples.

Situation	Best choice	Main trade-off	Next action
The room wakes you too early or needs screen darkness.	Blackout.	It improves light control through the fabric, but light can still show around edges and headings.	Check the heading, pole or track as well as the lining.
The room feels cold, draughty or exposed at the window.	Thermal.	It adds comfort and insulation, but it is only worth choosing when warmth is a real priority.	Compare the room’s heat-loss problem with the face fabric you want.
The room mainly needs a neat finish and everyday privacy.	Sateen.	It is lighter and cleaner in finish, but it is not the specialist choice for darkness or insulation.	Use sateen when the fabric look matters more than extra performance.
You like a designer fabric but are unsure how the finished curtains will hang.	Pair the fabric and lining decision.	A heavier or specialist lining can change weight, handle and drape.	Order a fabric sample and compare it with the room’s practical need.

What Does This Room Need Its Curtain Lining to Do?

Start by naming the room’s main job: reducing light, improving warmth, cutting draughts, supporting privacy, or giving the curtain fabric a neat backing. A bedroom with early morning sun has a different problem from a draughty bay window or an evening-only dining room.

In a made-to-measure consultation, the practical question is often not “which lining is best?” but “what would make this window feel wrong after fitting?” A south-facing nursery might feel wrong if morning light leaks through; a bay-front sitting room might feel wrong if the curtains look beautiful but still leave the seating area cold; an occasional dining room might simply need a tidy lined finish.

Is the problem light, warmth, privacy, fabric finish, or a mixture?
Will the room be used early in the morning, late at night, every day, or only occasionally?
Would a specialist lining solve the main problem, or would it add weight the fabric does not need?

Ian Mankin’s curtain lining advice frames lining choice around the most suitable lining for the room.^[2] British Made Interiors also explains that the choice of lining depends on the room being designed.^[3]

What Is the Difference Between Blackout, Thermal, and Sateen Lining?

Ian Mankin describes blackout curtain lining as thicker than standard lining and used to block dazzling sunlight from passing through curtains and blinds.^[4] One comparison guide says a foam-backed blackout option can block 90–95%^[5] of light and rates triple-weave construction at 98%+^[5]. Treat those figures as benchmarks, not a promise about every window.

A blackout option can greatly reduce light through the curtain fabric, but it is not a promise of complete darkness: light can still show around curtain tops, edges, tracks, poles, or window gaps. Homes & Gardens makes the same practical point about light entering at the top of curtains.^[6] If sleep is the main reason for choosing blackout, read our guide to whether blackout curtains help you sleep.

The thermal option is different. British Made Interiors explains that its thermal linings use a blend of polyester and cotton with a thin foam layer to give the fabric its thermal properties^[3]. Ideal Home describes thermal-lined curtains as a way to insulate windows and keep cold air from affecting the room as much.^[7] Groundwork also discusses thermal curtains as one route for reducing heat loss through windows.^[1]

The sateen option is the lighter standard choice. British Made Interiors states that sateen is 100% cotton^[3] and a lightweight single layer with a sheen finish that hangs well for curtains and Roman blinds^[3]. Choose it when the room needs a clean backing and good finish more than specialist light or heat control.

Criterion	British Made Interiors	Just Fabrics	The Sewing House
Lining option range	Frames made-to-measure curtains and blinds around sateen, blackout and thermal.	Covers blackout, thermal and standard cotton sateen linings.	Lists light-dimming standard, natural cotton, blackout, thermal and bonded interlining for Roman blinds.
Blackout function	Describes blackout as a three-layer bonded option for bedrooms and spaces needing less intrusive light.	Describes the blackout option for buyers who want to block sunlight.	Says blackout is for bedrooms and prevents light being visible through stitching.
Thermal function	Says the insulating lining uses a polyester/cotton blend with a thin foam layer.	Presents the thermal option as improving insulation.	Lists a thermal option for Roman blinds to help retain heat.
Standard sateen role	Describes sateen as lightweight 100% cotton with a sheen finish for curtains and Roman blinds.	Says plain cotton sateen backs the face fabric, helps drape and protects from sunlight.	Describes standard lining as glare-filtering and cotton lining as soft, natural and light-diffusing.

Which Lining Works Best for Bedrooms, Cold Rooms, and Living Spaces?

For a bedroom, ask whether the room will stay comfortable when you need it. British Made Interiors describes the blackout option as useful for bedrooms and spaces where less light is beneficial, with three bonded fabric layers, also known as triple-pass blackout^[8]. Ian Mankin also uses bedroom curtains and blinds as a common blackout example.^[2]

Choose thermal lining for cold, draughty, or heat-loss rooms because it is designed to add insulation and improve comfort at the window. Livingetc reports that a good insulating lining can reduce heat loss by up to 25%, although full test conditions are not given.^[9] Groundwork reports The Eco Experts’ claim that high-quality thermal curtains can cut the heating bill of an average three-bedroom home by £327 per year^[1]. Treat these as quoted examples, not guaranteed savings. The room, window, curtain size, hanging method and heating use all matter. For a thermal-only follow-up, see our advice on whether thermal curtains are effective.

Sateen is usually enough when the room does not need extra darkness or insulation and the priority is a lighter standard finish that backs the curtain neatly. That can suit living rooms, dining rooms and decorative schemes where the face fabric is doing most of the design work.

If a room needs both darkness and warmth, let the main problem lead: blackout is stronger for light control, while thermal is stronger for insulation. A child’s bedroom that wakes with the sunrise may need blackout first; a north-facing sitting room may need the warmer option first.

Room or need	Likely lining	Why it fits
Bedroom, nursery or media room	Blackout	Light control is the leading need.
Cold bay window or draughty sitting room	Thermal	Warmth and comfort matter more than darkness.
Dining room or occasional-use room	Sateen	A neat finish may be enough.
Street-facing living space	Sateen, blackout or thermal	Choose by the real priority: finish, light or warmth.

Will the Lining Suit Your Curtain Fabric and Finished Look?

Curtain lining can change weight, fullness, drape, hanging behaviour, and the finished appearance, so the lining should suit the face fabric as well as the room’s practical need.

This matters with made-to-measure curtains because you are choosing how a designer fabric will look and feel once it is made up. A light fabric, bold pattern, textured weave and soft plain can all respond differently when paired with a specialist lining. As a vendor benchmark, Curtarra lists one off-white polyester lining at 220GSM^[11], which shows why lining weight is worth checking.

Treat the face fabric and lining as a paired decision: start with the room and the fabric look, then choose a lining that supports the practical requirement. Ian Mankin gives examples including decorative linings, wool curtains that may not always need lining, and sheers intended to let light through.^[2]

For a blackout bedroom, you may accept a fuller, more structured finish because light control matters. For a softer living room curtain, sateen may keep the look lighter. For a cold room, the warmer lining may be worth the extra body because comfort is the main purpose.

With our made-to-measure curtains, you can choose the fabric and lining together. If you are unsure, order a fabric sample and judge it in the room.

Which Curtain Lining Should You Choose Before You Order?

Use our lining guide and made-to-measure curtain pages to compare the options before you order. On the curtain page, British Made Interiors describes the standard sateen choice as a single-layer standard lining available in white, ivory and cream^[8].

Yes, lining choice can affect the price or value of made-to-measure curtains enough to change the decision. A specialist lining can offer better value when it solves the room’s main problem, such as warmth or light control, while sateen may be the better-value choice when a standard finish is all that is needed. Groundwork’s thermal curtain cost and savings examples show why this should be judged as a room-specific value decision, not a blanket upgrade for every window.^[1] Ideal Home also quotes Blinds 2go’s claim that heavy curtains can have possible yearly savings of up to £344.50^[10], but that is a promotional, method-limited example rather than a result every home should expect.

Check before ordering	Why it matters
Room priority	It decides whether light, warmth, privacy or finish should lead.
Face fabric	The lining should support the fabric’s look, handle and drape.
Lining option	Blackout, thermal and sateen solve different problems.
Fabric sample	A sample helps you judge colour and texture in the real room light.

FAQs About Curtain Linings

Are blackout, thermal, and sateen linings suitable for Roman blinds as well as curtains?

Some lining information applies to both curtains and Roman blinds, and British Made Interiors describes its sateen option as hanging well for curtains and Roman blinds.^[3] Still, do not assume every lining option suits every fabric, blind style or room. Check the live product options before ordering.

How should lined made-to-measure curtains be cared for after installation?

For British Made Interiors curtains and Roman blinds, avoid washing them at home. Professional dry cleaning is the safer route, especially where linings, headings and designer fabrics are involved. Care depends on the full made-to-measure item, including lining and heading.