Adding Blackout Lining to Existing Curtains: A Complete Guide for Kenyan Homes

If you like the colour and pattern of your curtains but want stronger light control, adding blackout lining may be worth considering. It can allow you to retain the decorative fabric while changing the layer behind it. However, the result depends on the condition, construction and fit of the existing curtains as well as the lining itself.

This guide explains how to assess that option before buying material or arranging alterations. It does not assume that every curtain can be converted. Start by identifying what you want to improve, then compare an alteration with suitable options in the blackout curtain collection. A maker needs to confirm whether the proposed construction will work for your particular curtains.

Separate light through the fabric from light around it

Close the existing curtains when the window is bright and look carefully at the source of the light. A broad glow through the material suggests that the fabric is transmitting light. A narrow bright line beside the wall, above the heading or between the panels points to an uncovered area.

Blackout lining addresses the material through which light passes, but it does not automatically extend the curtain width or change the mounting position. A lining can therefore improve one part of the problem while a side gap remains. Take photographs of the whole window and of any obvious gaps so the maker can understand both issues.

Use the blackout curtain light-gap guide before deciding that new lining is the complete solution. If you are unsure about the existing material, our blackout versus room-darkening comparison explains why those descriptions should not be treated as interchangeable.

Decide what you want to keep

Identify why the existing curtain is worth retaining. You may like the fabric, need it to match other furnishings or prefer its established heading and proportions. Those reasons help the maker choose between a limited alteration and a more extensive remake.

Also identify what you are willing to change. Adding a lining may affect how the curtain hangs, how bulky the folds become and how much space it occupies when open. If preserving a very light, flowing appearance is essential, discuss that before selecting a lining rather than expecting the finished curtain to behave exactly as before.

Photograph the curtain open and closed, and keep its original fabric reference if available. For a room where colour is the main concern, the light-coloured blackout curtain guide explains why you do not necessarily need to replace a pale face fabric with a dark one to pursue better light control.

Inspect the existing fabric and construction

Check the face fabric, seams, hem and heading for visible wear or damage. Note areas that are faded, distorted, torn or fragile. A curtain may look acceptable from across the room while the top edge or stitching needs attention before it can support a revised construction.

Do not assume that a new lining will hide or repair every weakness. Ask the maker whether the fabric can tolerate the planned work and whether existing seams must be opened. If the curtain has already been altered, mention that and provide any information about earlier repairs.

The assessment should include the existing lining if there is one. The proposal might involve replacing it, retaining it with another layer or choosing a different approach. Each option affects bulk and labour. Ask what will remain in the finished curtain so the quote and care instructions describe the same assembly.

Understand the available lining arrangements

A maker may propose an attached lining as part of the curtain construction. Alternatively, a compatible detachable lining system may be available for a particular heading. A separately operated blackout treatment behind the curtain is another option, but it is a different arrangement with its own hardware and coverage requirements.

Ask how the proposed lining connects at the top, sides and hem, and whether it is intended to be removed independently. Do not choose based only on a photograph of the lining material. The connection to the curtain determines how it moves and how it can be handled for cleaning.

For example, Dunelm’s curtain lining size guide describes dimensions specific to its lining kits. That illustrates why a kit must be matched to its instructions; its allowances should not be copied as a universal rule for a custom curtain made in a different way.

Match the lining to the existing heading

The heading is more than a decorative finish. It governs how the curtain is supported and how the top folds when drawn. An eyelet curtain and a pleated curtain do not necessarily accept the same lining attachment, and an existing tape may have limits that are not visible from the front.

Ask the maker to identify the heading and explain whether it can be retained. If hooks, rings or other accessories need changing, include them in the specification. A lining that hangs from the wrong point can sit visibly below the top or create awkward tension in the main curtain.

Our eyelet versus pinch pleat guide provides a useful introduction to heading differences. If the proposed change involves a new heading entirely, compare that extra work with the custom blackout curtain route before approving the alteration.

Measure the curtain and the window separately

Record the existing finished curtain dimensions, the usable rod or track width and the window opening. These are different measurements. Also record how far the curtain reaches beyond the glass and where the hem sits when the curtain is actually hanging.

Do not order lining simply by repeating the window dimensions or the size printed on an old curtain packet. The chosen attachment method, heading and hem treatment determine the lining dimensions. The maker or lining supplier should confirm those requirements before material is cut.

Use the blackout curtain measuring guide to organise your notes, then identify which numbers describe the existing curtain rather than a proposed replacement. If the two panels differ in size or hang unevenly, record each separately instead of assuming that one measurement applies to both.

Check weight, support and travel

The finished curtain includes the face fabric, lining, heading and accessories. Adding material changes what the rod or track must support. Have the hardware assessed for the revised arrangement, especially across a long span or where the existing fitting already sags or moves.

Operation matters as well as weight. The curtain should travel along the intended path without catching at a support or joint. Added bulk may make a previously convenient stack difficult to accommodate beside a window or behind furniture.

Read the rails and rods guide when discussing the hardware. For broad openings, our wide-window blackout guide explains why panel movement and gathering space should be planned together. Do not assume that keeping the original fabric means the rest of the installation can remain unchanged.

Consider fullness and appearance after alteration

A lining sits within a curtain arrangement that already has a particular width and fullness. It cannot create extra face fabric where the existing curtain is stretched tightly across the opening. If the panels barely meet now, the maker should assess coverage before treating lining as the only change.

Ask how the lining will follow the folds and whether it could show at the sides or hem. Patterned fabrics may also need careful handling if seams or headings are being remade. A sample of the proposed construction, where available, can help explain the intended result.

Our curtain fabric quantity guide distinguishes fabric consumption from finished coverage. That distinction is useful when a quote includes extra work to increase coverage or reshape a curtain, rather than simply attaching a new layer behind the existing panels.

Agree care instructions before combining materials

Find the care information for the face fabric and ask for the proposed lining instructions. If they differ, the maker needs to explain how the finished curtain should be cleaned. Two individually washable materials do not automatically make every combined construction suitable for the same treatment.

Confirm whether the lining is removable, whether any accessories must come off before cleaning and which washing, drying or finishing methods are permitted. Do not assume that dry cleaning, steaming or a gentle machine cycle is appropriate without the relevant instructions.

The blackout curtain cleaning guide explains a label-first approach. Keep the final care advice with the alteration record. If the new assembly will be too large or heavy for your usual cleaning arrangements, include that practical cost in the decision before the work starts.

Compare three routes using complete quotations

Ask for a clear quote for the alteration, including lining material, labour, repairs, accessories and any fitting changes. Confirm whether the curtains need to be taken down and rehung, and who is responsible for those steps. A low price for lining fabric alone does not describe the finished project.

Compare that with a new custom curtain and, where appropriate, a separate blackout treatment behind the existing fabric. The separate treatment may preserve the decorative curtain, but it introduces another set of dimensions and hardware. Our blinds versus curtains guide can help frame that alternative.

If you compare ready-made replacements, check panel count, dimensions and heading rather than matching only a headline price. The ready-made blackout price guide discusses that route. Custom alteration costs depend on the actual fabric, length, construction and work required, so request a specific quotation.

Match the decision to the room’s use

In a bedroom, examine coverage at the times light normally enters and include the edges in the assessment. Our bedroom blackout guide connects that requirement to the wider room layout. The aim is to improve the actual problem, not simply add a layer that sounds more substantial.

For a home office, consider whether you need stronger exclusion all day or only during particular working hours. The home-office blackout guide explains how screen position and other light sources affect the choice.

In a living room, retaining a sheer behind an opaque curtain may provide useful flexibility. If you are considering changes to that arrangement at the same time, use the sheer and blackout layering guide to make sure all layers and hardware are specified together.

An example of when assessment changes the plan

Imagine a pair of patterned curtains that still looks good but glows in bright daylight. The owner would like to retain the design. An initial fabric assessment suggests that a lining may be possible, but the curtain currently hangs from a lightweight rod and barely meets at the centre.

The decision now involves more than buying lining. The maker needs to assess the heading and coverage, while the fitter checks the rod. If substantial remaking and new hardware are required, the alteration quote may approach a replacement option. If the construction is suitable and the coverage already works, the alteration may remain attractive.

This is an illustrative example rather than a Curtains Kenya project. It shows why a recommendation should follow inspection. The same lining material can lead to very different proposals depending on the existing curtain and installation.

Prepare a written alteration brief

Before approving the work, bring the decisions into one brief. Identify the curtains by room, state the number of panels and record the fabric reference where known. Describe whether the existing lining will stay or be removed, which heading will be retained and what accessories are included.

Ask for the agreed finished dimensions and a description of any visible changes. Confirm the expected completion date, collection or delivery arrangements and the proposed cleaning method. If repairs are needed, distinguish them from the lining work so their scope is clear.

This record helps both sides check the same result at handover. It also avoids a later misunderstanding about whether the quote covered material only, a complete alteration or removal and rehanging.

Confirm the finished result at handover

Check that the approved face fabric has been retained as agreed and that the lining sits neatly without showing where it should be concealed. Open and close both panels, inspect the hem position and confirm that the revised curtain gathers in the available space.

Assess light control when the window is bright, remembering that fabric transmission and edge gaps are separate issues. If you notice an unexpected bright strip, identify its location before assuming the new lining is defective. Ask for an explanation of any fitting limitation that remains.

Keep the written specification and care instructions. If the property is rented, refer to the rental-home curtain guide before changes to fittings. To start an assessment, contact Curtains Kenya about adding blackout lining with photos of the front, back, heading and existing hardware, together with the current measurements.