Curtain Linings Explained: Blackout vs Thermal vs Sateen

The better curtain lining depends on the room’s main job: blackout for light control, thermal for insulation, and sateen for standard finish and drape. Choose blackout for bedrooms, nurseries or media rooms where intrusive light is the priority; thermal for colder rooms where insulation matters more; and sateen for everyday curtains where lighter drape and fabric compatibility matter most.

If you are close to ordering made-to-measure curtains, match the lining to the room first, then check it alongside your face fabric, heading and finished curtain choices in our made-to-measure curtains.

Key Takeaways

• Blackout, thermal and sateen are not a good-better-best ladder. They solve different room problems.
• Use blackout where less light entering the room is the main need.
• Use thermal where cold windows, heat loss or seasonal comfort are the main concern.
• Use sateen where you want a standard lightweight lining that works well with everyday curtain drape.
• If two needs compete, decide which problem would annoy you most after the curtains are made.

What blackout, thermal and sateen curtain linings actually do

Curtain linings explained simply: blackout controls light, thermal adds insulation, and sateen gives a standard lightweight finish for everyday made-to-measure curtains. The lining sits behind your designer fabric, so it affects both performance and drape.

Blackout is the most specialist light-control choice. British Made Interiors describes blackout as composed of 3 separate layers of fabric and termed “3 Pass Blackout”^[1]. On our curtain range, blackout is also described as three layers of fabric bonded together to block out intrusive light^[2].

The thermal option is for comfort at the window. It is described as made from a blend of Polyester and Cotton as well as a special thin foam layer^[1], and British Made Interiors says studies have suggested that up to 35%^[1] of a house’s heat is lost through its windows. Sateen is the everyday option: made from 100% cotton^[1] and hangs well for curtains and Roman blinds.

Blackout vs thermal vs sateen: the quick comparison

Blackout, thermal, and sateen linings are not interchangeable: blackout prioritises light reduction, thermal prioritises insulation, and sateen prioritises standard finish and drape.

For sateen, British Made Interiors also notes that it is a single layer of fabric and available in 3 colours; white, ivory & cream^[2]. That helps you pair the lining with the face fabric and room scheme. Sateen is 100% cotton^[1], but it does not perform like blackout or an insulation-led option.

How to choose by room use, light control and insulation

Use the room’s main problem as the filter: intrusive light points to blackout, cold or heat-loss concerns point to thermal, and everyday curtain finish, drape, and fabric compatibility point to sateen.

For a front bedroom that catches early morning sun, blackout is usually the first lining to check. OX Magazine describes blackout curtain lining as blocking up to 99%^[3] of incoming light, while DotcomBlinds says a 3-pass blackout process can block 100% of light^[4] from passing through the material itself. Edge gaps, heading style and fitting can still affect the finished room.

For a cold sitting room, bay window or draughty dining room, thermal is the better starting point. A third-party vendor claim reports energy bill reduction of over25%^[5], but it does not give the study method or British Made Interiors product conditions, so treat it as a caveated market claim rather than a promise for your home.

If your room is not especially bright or cold, sateen is often the calmer choice where fabric, heading and curtain fall are the main design concerns.

When blackout is the best fit

Choose the blackout option when reducing intrusive light is the main priority, especially for bedrooms, nurseries, media rooms, or other rooms where less light entering is beneficial. It is the right branch of the decision when the room problem is clear: you want the curtain to work harder against light.

Choose blackout for the room, not just for the fabric. A pale fabric in a sunny bedroom may still need blackout if sleep is the priority; a darker fabric in a shaded snug may not.

The trade-off is expectation. Blackout works at the fabric level, but the way a curtain meets the wall, pole, track or recess can still let light in. Other lining ranges also distinguish blackout from standard and interlined choices, reinforcing that lining type is only one part of the finished result^[6]. If sleep is the reason you are considering blackout, read our notes on blackout curtains for better sleep.

When thermal is the best fit

Choose the thermal option when insulation and room comfort are the priority, because it is a thicker lining designed to trap heat and help rooms feel warmer in winter and cooler in summer. British Made Interiors describes thermal as a thick lining, great for trapping heat and keeping a room warm in winter and cooler in summer^[2].

This makes thermal a strong fit for a sitting room with a large window, a bedroom over a bay, or a room that feels cooler once the heating goes off. Choose thermal because the window affects comfort, not because you want the strongest light control.

The risk is overclaiming savings. Outcomes vary by window, room, fabric, fitting and wider home insulation. For the narrower comfort question, read our advice on whether thermal curtains are effective, then return to your curtain specification.

When sateen is the best fit

Choose sateen for everyday curtains where a standard, lightweight lining and good drape matter more than specialist blackout or thermal performance.

British Made Interiors describes sateen as a lightweight material composed of one layer of fabric and so hangs well as both curtains and roman blinds^[1]. Use it where you want a neat curtain that works with the chosen fabric, rather than specialist performance.

The common mistake is to choose sateen for a bedroom simply because it is standard. It can suit a shaded guest room, but not a child’s room, shift-worker bedroom or media room where reduced light is the main reason for new curtains.

How lining choice affects fabric compatibility and ordering confidence

The best lining for made-to-measure curtains matches the room brief before ordering: blackout for light control, thermal for insulation, and sateen for standard drape and fabric pairing. Then check how it works with your fabric, heading and curtain type.

Start with choosing the right curtain fabric, then treat lining as part of the same specification. British Made Interiors’ Apex Ivory made-to-measure curtain page shows fabric, brand, single or pair option, heading, lining and measurements within one buying path^[7].

This is where ordering confidence comes from. Voyage Maison’s made-to-measure FAQs show the wider market difference between fixed ready-made sizes and made-to-measure choices, including more limited heading options^[8]. The practical point is to check lining inside the full made-to-measure curtain journey.

In a Trustpilot review, one Consumer described spending considerable time researching made-to-measure curtains online before using our website and service for curtains across the house. Treat that as one buyer’s experience, not proof of a typical result; the useful lesson is to compare clearly and confirm the curtain fabric, lining, heading and measurements before ordering.^[9]

If you are unsure, use our curtain range to see how lining sits within the order choices. If the uncertainty is about size, use our measuring support rather than this lining comparison.

FAQ

Is blackout lining better than thermal lining?

The blackout option is better if light control is the main problem. Thermal lining is better if insulation and seasonal comfort are the main problem. Neither is better for every room.

Does thermal curtain lining also block light?

A thermal lining may reduce some light because it adds body behind the fabric, but its supported purpose is insulation. Choose blackout if reduced light is the priority.

Is sateen suitable for bedrooms?

Sateen can suit a bedroom where you want a standard lined finish and light is not a concern. Choose blackout instead if morning light, street light or sleep quality is the main issue.

Should I choose the lining before or after choosing curtain fabric?

Choose the room need first, then check the lining with the fabric, heading and curtain order choices. Specialist fabric suppliers also frame lining choice as a room-led decision, not an isolated add-on^[10].

References

1. Linings Explained - Sateen, Blackout & Thermal, British Made Interiors
2. Made To Measure Curtains, British Made Interiors
3. Blackout Curtain Lining Vs. Thermal Lining: Which One Is Right For You?, OX Magazine
4. Lined vs Unlined Curtains: Which Should You Choose?, DotcomBlinds
5. How To Choose Curtain Lining and Interlining, Livingstone Textiles
6. A Guide to Different Types of Curtain Lining, Curtains Curtains Curtains
7. Apex Ivory Curtain by Clarke and Clarke, British Made Interiors
8. Made to Measure FAQs, Voyage Maison
9. Trustpilot review by Consumer
10. Everything There Is to Know About Curtain Lining Fabrics, Ian Mankin