Built-In Wardrobes & Storage: Frame Construction, Sliding Doors & Maximising Space

Summary

Built-in storage is one of the highest-value carpentry jobs in terms of customer satisfaction. Done well, it transforms a bedroom or hallway, makes a property feel custom and premium, and maximises otherwise dead space in alcoves, under stairs, and sloping ceilings. Done badly — with frames that rack, shelves that sag, or sliding doors that bind and jump their tracks — it generates disproportionate callbacks and unhappy customers.

The core skill is joinery sequencing: measuring precisely, scribing to irregular walls, building the carcass square independent of the walls, and then fitting panels to the reveals. Many tradespeople make the mistake of trying to make the carcass fit the wall rather than building the carcass square and scribing panels to the wall. The latter produces better results because walls are rarely plumb, level, or flat.

Sliding door systems have become the dominant choice in UK bedrooms over the past decade. The principal trade names — Hettich, Hafele, Spacepro, Wardrobes Direct — all use broadly similar track systems but with specific installation tolerances. The floor-to-ceiling sliding door look that customers show in Pinterest inspiration images requires very precise plumb installation, ceiling-height clearance (or dropped soffit), and a track system rated for the door weight.

Key Facts

• Standard wardrobe depth: 600mm internal for hanging clothes (to accommodate standard hangers); 500mm for folded clothes only
• Hanging rail height: 1,800–2,000mm from floor for full-length dresses/coats; 900–1,000mm for double-hung (2 rails for shorter garments)
• Shelf span (18mm MDF): Maximum 900mm unsupported for standard loads (folded clothes, shoes); 600mm maximum for books or heavy items
• Shelf span (18mm plywood): Maximum 1,000mm for light loads — plywood is stiffer than MDF for the same thickness
• Shelf nosing: Edge-banding or hardwood lipping prevents chipping and improves appearance; MDF raw edge is unsuitable for front edges
• Carcass material: 18mm MDF most common for painted finish; 18mm birch plywood for painted or veneered; CLS timber frame for large spans
• Back panel: 6mm MDF or 3mm hardboard — provides racking resistance; fix with PVA and pins at maximum 150mm centres
• Fixing to masonry: Use plugs and screws for structural fixings; chemical anchors for fixings bearing significant load (hanging rails)
• Fixing to stud walls: Locate studs before fixing — never rely on plasterboard alone for structural loads; rail brackets must hit studs
• Scribing: Use a pencil compass or scribing block to transfer wall profile to panel — never cut panels before scribing
• Sliding door top track: Must be dead level — even 2mm off level will cause doors to drift to one side
• Sliding door weight capacity: Typical residential systems rated at 25–50kg per door panel; heavy glass doors may need reinforced top track
• Bypass doors (2 panels, each covering half): Cheapest sliding solution; limited access — only half the opening accessible at once
• Full-access sliding systems: 3+ panels on separate tracks — more expensive but full opening possible
• Soft-close mechanisms: Available on most quality sliding systems; prevents slamming and extends track life

Quick Reference Table

Detailed Guidance

Planning and Measuring

The most important phase of any built-in project is the initial survey. Measure the width, height, and depth of the opening at multiple points — top, middle, and bottom for width; left, right, and centre for height. Record the worst-case dimension for each. Walls in UK houses are rarely perfectly parallel or plumb; alcoves from Victorian chimney breast removal often have a plaster reveal that is 10–15mm out of square.

Check the floor for level using a spirit level and identify the high point. If the floor drops more than 5mm, you may need to use a trim strip or packer at the low side to keep the base panel level. Check the ceiling for level in the same way.

Photograph the space with measurements clearly visible, or use a sketch with dimensions. This forms your record of site conditions and protects you if the customer queries the final dimensions during snagging.

Carcass Construction

Build the carcass flat on the floor before standing it up. This is far easier than trying to fix pieces in position in sequence. Use a pocket hole jig (Kreg or similar) for strong, hidden fixings, or confirm-and-cam (euro screws) for a factory furniture appearance.

Sequence: fix bottom panel to side panels first, then top panel. Fit the back panel last — use the back panel to square the carcass by measuring diagonal dimensions and adjusting until equal before pinning the back.

For tall wardrobes (full ceiling height), the carcass is typically made slightly shorter than the floor-to-ceiling height to allow it to be tilted upright. A scribing moulding or cornice at the top covers the gap between the top of the carcass and the ceiling.

Internal dividers (for separate hanging/shelving bays) are typically dadoed or housed into the top and bottom panels using a 18mm-wide housing joint (router or table saw). This prevents the dividers from racking under load.

Scribing to Irregular Walls

If the wardrobe is in an alcove with masonry walls, the side panels will need to be scribed to the wall profile. Set the panel in position with a 10–15mm gap to the wall. Set a compass to the maximum gap dimension and draw a pencil line along the panel face, tracking the wall profile. Cut along this line with a jigsaw (gentle curve) and the panel will fit snugly against the wall.

For straight walls that are simply out of plumb, a scribing strip of solid wood (25mm wide) is glued to the back edge of the panel and planed to the wall angle. This avoids cutting the main panel and is quicker.

Caulking and silicone: always finish the scribed joint with decorator's caulk (paintable) before painting. A scribed joint that is not caulked will develop a visible gap as the house moves through seasons.

Sliding Door Installation

Top-hung sliding systems (most common in domestic applications) use a top track fixed to the ceiling or to a head rail. The doors hang from roller carriages that run inside the track. The floor guide is a simple channel or pin that keeps the bottom of the door from swinging.

Step 1: Fix the top track dead level. Use a long level or laser level — even 1–2mm over 3m will cause noticeable drift. Fix through the track at maximum 200mm centres using plugs and screws into solid material (ceiling joist, timber head, or masonry soffit).

Step 2: Hang the doors and adjust the roller height to ensure the door is perfectly vertical. Virtually all systems have screw-adjusted rollers — turn to raise or lower each corner of the door independently. Check with a level or plumb bob.

Step 3: Fit the floor guide. This is usually adjustable in the panel thickness direction only. Set so it guides the door without binding.

Step 4: Adjust the soft-close mechanism (if fitted). Typically a nylon buffer at each end of the track that engages the roller carriage for the last 30–50mm of travel.

Maximising Space — Design Tips

Under-stairs storage: the most underused space in UK homes. Measure the headroom at each point along the stair string. Design pull-out drawers for low areas (under 600mm), fixed shelves for mid-height areas, and a tall door unit for the highest area. Bespoke carpentry is required for stepped profiles but the result is transformative.

Sloping ceilings: use low-level drawers and shoe rails at the shallow end, full-height hanging at the tall end. A horizontal beam spanning the space at hanging height creates the hanging rail without needing it to go all the way to the ceiling at the sloped section.

Bedroom alcoves: fit full-height MDF panels to close off alcoves flush with the chimney breast face, creating a unified wardrobe run. Internal shelf and drawer fitments can be standard flat-pack components dressed with the external MDF frame.

Corner wardrobes: carousels or lazy susans for true corner access, or accept a dead zone in the extreme corner behind full-height doors. Walk-in L-shaped configurations require a minimum room depth of 900mm per arm plus the door swing width.

Painting and Finishing

Spray painting MDF wardrobes gives the flattest, most professional finish but requires a spray booth or well-sealed workspace. Water-based satin or eggshell is most commonly specified.

For site painting: sand all faces to 120 grit, apply MDF sealer or watered-down eggshell as a primer coat, sand to 240 grit, then apply two topcoats. Internal faces are typically painted the same colour as the external finish or left white. Do not omit priming MDF edges — unprimed MDF edges absorb paint aggressively and remain rough.

Door faces: for large painted slab doors, use moisture-resistant MDF (green MR MDF) to minimise expansion. Moisture-resistant MDF is essential for any room with elevated humidity. Standard MDF doors in a bedroom are acceptable.

Frequently Asked Questions

Do I need Building Regulations approval for a built-in wardrobe?

In most cases, no. Fitted furniture in an existing room does not require Building Regulations approval. The exception is if you are making alterations to the structure — for example, removing a partition wall to create alcove space, or cutting through a structural wall. Any structural alteration requires Building Control notification.

How do I prevent shelves from sagging?

Use the correct span-to-thickness ratio. For 18mm MDF, maximum 900mm unsupported span for clothes and 600mm for books. For spans over 900mm, add a central support bracket or upright divider, or use 25mm MDF or 18mm plywood which is stiffer. Beware: even a correctly sized shelf will sag if overloaded — a shelf of folded clothes at 15kg can deflect 5mm over 900mm in MDF within a year.

How do I stop sliding doors from jumping the track?

Three common causes: (1) floor guide missing or too loose — the door is twisting and lifting the rollers; fit the floor guide and adjust. (2) Rollers are worn or dirty — clean and lubricate the track with a dry lubricant (silicone spray, not WD-40 which attracts dust). (3) Top track is not level — readjust with shims.

What is the minimum depth for a functional wardrobe?

600mm internal depth for full clothes hanging (400mm minimum hanger width plus clearance for door opening and air circulation). 500mm is marginal — hangers project slightly beyond the opening. 450mm is usable for folded items and shoes only. Always confirm the customer's intended use before fixing depth.

Regulations & Standards

• BS 8000 Part 5 (Code of practice for joinery) — workmanship standards for site joinery

• BS EN 14749 (Domestic storage furniture — storage units and bookcases) — safety requirements for household storage furniture

• Approved Document A — structural requirements if wall alterations are made

• FGA (Furniture Industry Research Association) — technical guidance on shelf loading and carcass construction [verify]

• Hettich Technical Documentation — sliding door system installation guides and weight ratings

• Hafele Sliding Door Systems — technical installation and design guidance

• AWMAC Architectural Woodwork Standards — carcass construction and material specifications

• Travis Perkins MDF Guide — MDF grades and applications

• Screwfix Trade Tips — practical installation guidance

• stud walls — partition wall construction if creating alcove spaces

• door frames — fitting door frames for built-in cupboard openings

• flooring types — flooring considerations around fitted furniture installation