Buying guide

Curtain Linings Explained: Blackout vs Thermal vs Sateen

Curtain linings explained for made-to-measure curtains: compare blackout, thermal and sateen finishes by room use, light control, warmth, fabric and finish.

British Made Interiors21 July 2026

Choose blackout lining for stronger light control, thermal lining for better insulation and comfort, or sateen lining for a versatile everyday finish when fabric compatibility and drape matter more than darkening or warmth.

Key Takeaways

Choose the darker-room option when light is the main problem, especially in bedrooms, nurseries or screen-focused rooms.
Choose the insulation-led option when warmth and comfort matter more than maximum darkening.
Choose a neat everyday lined finish where fabric, drape and lining colour need to feel balanced.
Treat lining as a room-and-fabric decision, not a simple upgrade.

Should You Choose Blackout, Thermal, or Sateen Curtain Lining?

Choose blackout lining when stronger room darkening is the priority, especially for sleep or screen comfort. Choose the insulation-led option when room comfort matters more, and choose a sateen finish when you want a neat, versatile everyday lined result.

If you are furnishing a bedroom that catches early summer light, blackout is usually the first lining to check. British Made Interiors explains that this darker-room option uses a 3 Pass Blackout construction made from three separate layers of fabric^[5], and its made-to-measure curtain page describes blackout as useful for bedrooms and rooms where allowing less light in is beneficial^[6]. Light exposure can also affect sleep timing: one cited passage says it shortened melatonin duration by approximately 90 minutes^[20].

The warmer lining choice is the better fit for a cold room, a draught-prone window or a space that feels uncomfortable in winter. British Made Interiors notes that studies suggest up to 35%^[5] of a house’s heat can be lost through its windows, so lining can support comfort even though it is not a window replacement.

Sateen is the calmer everyday option. British Made Interiors states that Sateen lining is made from 100% cotton and is a lightweight single-layer fabric that hangs well as both curtains and Roman blinds^[5]. Choose it when the curtain needs a lined, finished look without a specialist blackout or thermal role.

Your need	Choose	Know this	Before ordering
Darker bedroom or screen room	Blackout lining	Window-edge light may remain.	Check fabric and fitting together.
Warmer, less draughty room	Thermal lining	Warmth comes before darkness.	Match it to fabric weight and room use.
Neat everyday finish	Sateen lining	Less darkness and insulation.	Match the lining colour to your fabric.
Unsure about drape	Check fabric compatibility	Heavier lining changes fullness.	Order samples before deciding.

Add-on liners exist; Livingetc cites a separate thermal insulated blackout liner at $17.89^[1]. That is not the same decision as choosing lining built into made-to-measure curtains from the start.

Which Curtain Lining Works Best for Your Room?

Bedrooms, nurseries and media rooms usually lean towards blackout because light control matters most. Living spaces, halls, draught-prone rooms, sunny rooms and overlooked rooms often need a balance of warmth, privacy, light control and appearance.

Bedrooms, Nurseries, and Media Rooms

For a bedroom, nursery or media room, ask: “Will light spoil how I use this room?” If yes, the darker-room option is normally the safer first choice. Ideal Home frames blackout curtains around better sleep^[2], British Made Interiors cites early morning light and children waking early^[3], and Livingetc describes sheer and blackout layers used together for privacy, light control and atmosphere^[4].

For a living room, the best lining is less automatic. You may want softer daylight, smart drape, warmth near a bay window or privacy from the street. Homes & Gardens focuses on matching curtain type to use and look^[10], with designers also pointing to layered treatments where one window dressing has several jobs^[11].

For an older or colder room, thermal lining may be more useful than blackout. House & Garden connects blackout to bedrooms and thermal curtains to older houses, single glazing and rentals without double glazing^[9]. Ian Mankin says makers ask whether sunlight, draughts or noise are an issue before recommending a lining^[12]. If warmth is your main issue, our separate note on how thermal curtains work can help.

How Do Blackout, Thermal, and Sateen Linings Compare for Light, Warmth, and Finish?

Linings Explained - Sateen, Blackout & Thermal — Blackout, thermal and sateen linings solve different curtain problems, so compare the room need before choosing the lining.

Blackout improves light control, but room darkness still depends on edge gaps and fitting. Thermal is insulation-led; sateen is the everyday finish when darkening or insulation is less important.

Blackout is strongest for light through the curtain fabric. One comparison lists blackout curtains as blocking 95–100%^[8] of light, while another gives 85–100% blocking^[14] depending on product and installation. Treat those figures as guides, not room promises.

The insulation-led option is different. British Made Interiors describes it as a polyester-and-cotton blend with a thin foam layer^[5], and its curtain page calls it a thicker choice for helping keep a room warmer in winter and cooler in summer^[6].

The everyday lined finish sits between function and appearance. It protects the curtain face fabric from the sun, gives a neat lined back and is available in white, ivory and cream^[6]. On its made-to-measure curtains page, British Made Interiors describes sateen as a standard single-layer lining where the weave can be seen^[6].

Light Control Is Not the Same as Total Darkness

The common mistake is to hear “blackout” and expect a sealed room. The lining helps with the fabric, but light can still appear at the top, sides or bottom. Livingetc advises running bedroom curtains at least 3 or 4 inches^[13] beyond the window. Another source says edge gaps can allow 10-50 lux^[15] into a bedroom, while a more complete blackout claim of less than 1 lux^[21] depends on product and installation. Ideal Home also cautions that blackout fabrics and linings do not always block sunlight completely on their own^[2].

How lining guidance compares across made-to-measure curtain specialists
Priority	Best starting point	What it does	Check before ordering
Main choice	Start with the room need	Choose light, warmth or finish.	Decide your top priority first.
Light control	Blackout lining	Blocks most light through the fabric.	Allow for light around the window.
Warmth	Thermal lining	Adds insulation for colder rooms.	Balance warmth with fabric weight.
Drape and finish	Sateen lining	Supports a smooth, lightweight drape.	Match lining colour to face fabric.

Will Your Chosen Fabric Hang Well With That Lining?

Fabric choice matters because heavier linings can change handle, drape and finished appearance. Use samples and our lining information to check whether blackout, thermal or sateen suits the chosen fabric and heading style before ordering.

Designer Fabrics Need the Right Support Behind Them

If you have chosen a delicate linen-look fabric, soft velvet, bold print or textured weave, the lining should support the fabric rather than fight it. British Made Interiors notes that sateen lining helps protect curtains from the sun^[6]. House & Garden also treats window dressing as a technical decision, not just a colour choice^[17].

Match the lining to the fabric as well as to the room. A heavier blackout or thermal option can add body, but it may change how a fine fabric falls. Ian Mankin gives examples where lining affects light blocking, insulation, drape and decorative compatibility^[18]. Readers also comparing blinds may find our note on bonded lining for Roman blinds useful.

Fabric samples help here. Look at the face fabric in daylight and at night, then check whether the lining colour and weight still give the finish you want. With designer fabrics such as Romo, Villa Nova, Clarke & Clarke, Ian Mankin, Abraham Moon, Sanderson, iLiv, William Morris, Harlequin, Prestigious Textiles, Designers Guild, Scion or Voyage, the lining should protect the look you chose.

What Should You Know Before Ordering Made-to-Measure Curtains?

Before ordering, be clear on the room priority, preferred lining, face fabric and finished look. If you are still between two options, our lining information and made-to-measure curtains are useful places to compare your options.

Use four checks before you commit. First, name the room’s main job: dark, warm, private, soft or formal. Second, choose the lining that fits that job. Third, check the fabric and heading style. Fourth, check size details in our curtain measuring guides. Homes & Gardens warns that bespoke curtains involve more measurement decisions than off-the-shelf curtains, and that pole or track choice affects style and measurements^[19]. For size details, use our curtain measuring guides rather than solving that inside the lining decision.

If you already know the lining role you need, browse our made-to-measure curtains with that preference in mind. If you still want to compare the lining types more closely, use our lining guide for sateen, blackout and thermal. You can also start from our curtains range and keep the room priority in mind as you compare fabrics.

FAQ

How should you care for lined made-to-measure curtains after purchase?

British Made Interiors’ lining guidance says its made-to-measure curtains and Roman blinds are not washable, and that professional dry cleaning is best^[5]. Treat lined curtains as specialist soft furnishings: keep day-to-day care gentle, and use a professional cleaner if they need a deeper clean.