Buying guide

Curtain Linings Explained: Blackout vs Thermal vs Sateen

Q: Is blackout lining always better than thermal lining?

No. The blackout option is better when stronger light control is the main need.

Compare blackout, thermal and sateen curtain linings for made-to-measure curtains, with room-by-room advice on light control, insulation, drape and ordering confidence.

British Made Interiors18 July 2026

No single lining is best for every room. Choose blackout when stronger light control is the priority, thermal when insulation and draught comfort matter most, and sateen when you want an everyday curtain lining that hangs neatly and works with the chosen face fabric. Before you order made-to-measure curtains, check the room’s job, the face fabric, the lining colour and any detail that can affect performance at the window.

For most buyers, start with the room’s main job: blackout for bedrooms, children’s rooms or media spaces; thermal for colder rooms, older windows and draught comfort; sateen for everyday curtains where finish and drape matter more than specialist performance.

Key Takeaways

These three linings solve different problems, so the best choice depends on the room.
Blackout is the light-control option, but it should not be treated as a promise of complete room darkness.
The thermal option is the insulation-led choice, especially where windows feel cold or draughty.
Sateen works as the neat everyday finish when you want lighter handling and good curtain hang.
Before ordering, match the lining to the fabric, lining colour and finished look you want.

Blackout vs Thermal vs Sateen: The Quick Comparison

Blackout, thermal and sateen linings serve different needs. Blackout is made for stronger light control. Thermal is made for insulation and draught comfort. Sateen is the everyday finish and drape option.

In British Made Interiors’ (BMI’s) lining range, blackout is the heaviest choice: blackout is composed of 3 separate layers of fabric and termed “3 Pass Blackout”^[1]. The thermal option is different: these linings are made from a blend of Polyester and Cotton as well as a special thin foam layer^[1]. Sateen is lighter: Sateen lining is made from 100% cotton^[1].

That difference matters because windows can be a major comfort point in colder months. British Made Interiors cites studies suggesting that up to 35%^[1] of a house’s heat is lost through windows, though the source does not name the studies or give property-type detail. Treat that as a useful reason to think about lining, not as a savings promise.

Blackout vs Thermal vs Sateen: Quick Decision Table

Situation	Best choice	Main trade-off	Construction / numeric cue	Next action
Main room goal is sleeping, nursery use, or reducing bright light.	Blackout	Do not overpromise total darkness or ignore edge light and fabrication effects.	3-pass construction with 3 separate fabric layers^[1].	Compare our lining guide, then choose blackout within your curtain specification.
Room feels cold, draughty, or is used most in colder months.	Thermal	Avoid exact heating-bill promises or universal results.	Includes a thin foam layer with polyester and cotton^[1].	Use thermal as the insulation-led option and continue to our made-to-measure curtains.
You want a neat everyday finish and good curtain hang rather than specialist performance.	Sateen	A lighter everyday lining is not the best fit if blackout or insulation is the main need.	100% cotton in BMI’s lining range^[1].	Check face fabric and lining colour compatibility before ordering.
You are unsure whether performance or fabric finish matters more.	Start with the room’s primary job, then test the choice against fabric and finish.	It is easy to focus on the lining name and miss the finished curtain behaviour.	Blackout, thermal and sateen compared before you choose fabric, heading and finish.	Shortlist the lining, then view our curtains for fabric and style context.

Linings Explained - Sateen, Blackout & Thermal — Use the three lining choices as a decision tool: blackout for light control, thermal for comfort, and sateen for an everyday neat finish.

Choose by the Room’s Main Job

Compare blackout, thermal and sateen by the room’s main job first, then check light control, insulation, fabric compatibility, finish and ordering confidence before choosing your made-to-measure curtain specification.

For a bedroom, nursery or media room, blackout is usually the first option to consider. One vendor room-use guide recommends 100% blackout^[2] for bedrooms, but that is vendor guidance rather than an independent test. The practical rule is simpler: if sleep, screen glare or early morning light is your pain point, start with blackout and then check how the curtain will sit at the window. For more bedroom styling context, you may also find our advice on blackout curtains and interlining for a hotel-style bedroom useful.

For a sitting room, bay window or older home that feels cold, the thermal option is the stronger match. Fabrics Galore London points to older houses with single glazing, ill-fitting windows and doors as common thermal-lining scenarios^[3]. For an everyday living room where you care most about the look, the face fabric and a neat fall, sateen is often the safer default.

Light Control and Insulation: What Each Lining Can and Cannot Promise

Choose blackout when stronger light control is the main need, but do not expect the lining alone to make every room completely dark. The blackout material can reduce light through the fabric, yet light can still show at the sides, top, bottom or through small stitching points depending on the window, heading and making method. Drapery Design notes that 3 pass blackout can be stiff and heavy, and that needle holes may create pinholes of light^[6]. HomeDecGal also treats blackout as the stronger option when complete light blocking is the aim, while still showing that lining choice changes by fabric and making detail^[7].

The thermal option is the better choice when insulation and draught comfort matter most, especially in colder or draught-prone rooms. It should not be sold as a guaranteed heating-bill solution for every home. One supplier source says the heat-loss reduction figure increases to 25%^[3] with that curtain treatment, but it frames the figure as something “thought” to be true and does not identify the underlying study. James Dunlop Textiles cites New Zealand’s Energy Efficiency and Conservation Authority estimate that professionally fitted, lined drapery can reduce window heat loss by 40-60%^[4] when closed, but that estimate is for professionally fitted lined drapery, not one named lining product.

The safe buyer rule is to match performance to the problem you can see and feel. If the room is bright, look at blackout and read more about whether blackout curtains help you sleep. If the room loses warmth or feels draughty, look at thermal and learn more about how thermal curtains work.

Fabric, Drape and Finish Compatibility

Choose sateen when the priority is everyday drape, lighter fabric handling and a neat sheen finish rather than specialist blackout or insulation performance. BMI describes sateen as a lightweight, one-layer material that hangs well as curtains and Roman blinds^[1]. HomeDecGal also describes sateen as a basic go-to lining for window treatments^[7].

Fabric compatibility should be checked before ordering, not treated as an afterthought. A fine pale fabric, a bold patterned designer fabric and a heavier woven fabric can all behave differently once lined. The lining colour can also matter behind lighter fabrics, because the lining can affect the finished look from the room side and the window side^[1]. Wider market guides also frame linings as a way to balance privacy, insulation, light control and style rather than a one-name-fits-all choice^[10]^[11].

As a caution rather than a general rule, in a Trustpilot review, Abigail described a blind order where the lining felt thin to her and affected the fullness and hang she expected. That one blind experience does not prove a typical outcome, but it does show why lining thickness, fabric choice and finished drape are worth checking before you commit.^[8]

If you are choosing a fabric sample, judge the lining decision beside the fabric, not in isolation. If the main worry is light or warmth, do not choose sateen just because it hangs neatly. If the main worry is a soft, clean everyday finish, do not choose a heavier performance lining without thinking about handling and drape.

How to Order With Confidence

Ordering confidence comes from a simple sequence. First, name the room priority: sleep, warmth, privacy, everyday finish or a mix. Next, choose the lining that best fits that priority. Then check the face fabric, lining colour and heading so the finished curtain behaves as you expect.

Use our lining guide to compare the three choices, then choose your made-to-measure curtains, where fabric, heading and lining come together. For example, if you are comparing a patterned designer fabric with a plain woven fabric, the lining decision is part of the full specification, not a separate afterthought. Curtains Curtains Curtains also shows how UK made-to-measure retailers present lining as one part of a wider curtain choice, with standard, blackout and interlined options changing the finish and performance^[5].

In a Trustpilot review, one customer described spending time researching made-to-measure curtains online and valued British Made Interiors’s website for the breadth of fabric choice, the measure and order flow, heading choice and accurate finished measurements. Treat this as one person’s ordering experience, not a guarantee; use it as a reminder to check every specification before you place an order.^[9]

If measuring is your remaining concern, use our curtain measuring guides rather than trying to solve that inside the lining decision. The lining choice should help you order with more confidence, not pull you away from the room, fabric and finish you actually want.

FAQ

Is blackout lining always better than thermal lining?

No. Blackout is better when stronger light control is the main need. Thermal is better when insulation and draught comfort matter more.

Will thermal lining reduce my heating bills?

This option can support insulation and comfort, but it should not be treated as a guaranteed heating-bill saving for every home. Window fit, room use and how the curtains are closed all matter.

Is sateen lining suitable for bedrooms?

Sateen can suit a bedroom where you mainly want a neat everyday finish. If the bedroom needs stronger light control, blackout is usually the better starting point.

Can I choose the same lining for every room?

You can, but it is often better to choose room by room. A nursery, a draughty bay window and a formal living room may each need a different lining.