Planning an Eaves Cupboard: Making the Most of Low Sloped Ceiling Storage

May 18, 2026

Due to the sloped ceiling, an eaves cupboard requires angled concealed hinges with specific opening angles such as 30° or 45°, as well as precisely planned drawer runner systems.

Constructing a cupboard under sloping eaves presents fitters and joiners with particular geometric challenges. The knee wall or eaves wall – the vertical wall below the roof slope – typically limits the height to between 800 mm and 1200 mm. At the same time, the usable depth of the carcase varies significantly. To build into this asymmetrical space professionally, standard furniture fittings are not enough. Like the gears in a machine, hinges, runners, and connectors must be matched precisely to the angles and dimensions of the carcase to guarantee smooth operation.

This guide defines the technical criteria for selecting the appropriate hardware when planning and assembling an eaves cupboard.

Key Purchasing Criteria for Sloped Ceiling Fittings

When planning a cupboard for a sloped ceiling, the roof pitch and the knee wall height determine the selection of mechanical components. Pay attention to the following specifications.

Hinges and Opening Angles

Standard cupboards have right-angled carcases that utilise standard hinges designed for 90-degree angles. However, if the cupboard door meets a bevelled or angled carcase side, the mounting angle changes. This is where specialised angled hinges are required. The standard cup drilling diameter remains 35 mm. The choice of hinge depends strictly on the degree of the slope. Common special angles are 30°, 45°, or negative angles for steep slopes. The mounting application (usually full overlay or inset) must be taken into account when calculating door reveal gaps.

Drawer Runner Systems and Carcase Depth

In the lower section, the eaves often provide ample depth, making deep drawers a practical choice. For instance, if you plan a unit with a bottom depth of 500 mm, you will need suitably long drawer runners. A full-extension runner allows the drawer to extend 100% out of the carcase, which massively improves access to the back of deep units. A single-extension runner only exposes around 75% of the drawer. The nominal length of the runners typically ranges between 250 mm - 800 mm. For a 500 mm deep carcase, choose runners with a length of 450 mm or 500 mm, depending on the back panel thickness.

Load Capacity and Runner Type

Drawers under sloping roofs are often used for heavy items or laundry storage. The dynamic load capacity of the runners is critical. Standard drawer runners carry around 30 kg, whilst heavy-duty runners are rated for 45 kg or more. Technically, a distinction is made between traditional ball-bearing runners (side-mounted) and concealed undermount runners (mounted beneath the drawer base), which provide a cleaner look and often feature superior damping characteristics.

Carcase Joining and Levelling

Attic floors are frequently uneven. Adjustable furniture legs with an M8 or M10 thread are essential for levelling the carcase. Only an accurately levelled cupboard allows for uniform door reveals. For joining asymmetrical carcase components, cam and dowel connectors are ideal for 90-degree joints, whilst angled cuts are often secured using specialised mitre connectors or classic wood screws (with a TX drive for optimal torque transmission).

Types and Options at a Glance

A broad range of technical components is available for conversions under sloping ceilings:

Angled Concealed Hinges: Available for positive and negative angles. They compensate for deviations from the 90-degree standard.
Damping Systems: An integrated soft-close mechanism in the hinge or drawer runner gently cushions movement. Alternatively, add-on door dampers (clip-on or drilled-in) can be retrofitted.
Locking Hardware: If the eaves cupboard will store sensitive documents or tools, a furniture lock can be integrated. The backset (the distance from the door edge to the centre of the keyhole) must match the width of the door frame or stile.
Opening Mechanisms: Push-to-open (or tip-on) enables handleless fronts. A light press on the door or drawer activates a spring mechanism. Note: This mechanism operates in the opposite direction to damping and cannot be combined mechanically within the same component.

Which Fitting for Which Application? (Decision Guide)

The geometry of your room dictates your choice of materials. Use the following guidelines to determine the correct hardware:

If the roof slope is exactly 45 degrees and the door is hinged along this slope, then use a 45-degree angled hinge.
If you use the unit as deep storage for bedding (e.g. carcase depth of 600 mm), then install a full-extension runner with a nominal length of 550 mm and a load capacity of at least 40 kg.
If the room is tight and handleless fronts are required (e.g. in a narrow hallway), then choose push-to-open fittings instead of protruding handles.
If the floor has significant unevenness, then fit height-adjustable plinth feet capable of compensating for at least 15 mm - 20 mm of height variance.

Installation Advice: Fitting Under a Slope

Assembling an eaves cupboard requires precision, particularly when drilling hinge cup holes and line boring.

Required Tools:

Cordless drill/driver
Forstner bit (Ø 35 mm for the concealed hinge cup)
Wood drill bit (Ø 3 mm or 5 mm for pilot holes and System 32)
Pozi screwdriver (PZ) or Torx (TX)
Spirit level and tape measure

Step-by-Step Hinge Installation:

Measure and Mark: Determine the distance for the hinge cup hole. For standard hinges, the cup drilling distance (from the door edge to the edge of the hole) is usually between 3 mm and 6 mm.
Drill the Cup Hole: Using the 35 mm Forstner bit, drill the blind hole for the hinge cup into the door. The drilling depth is generally 11.5 mm to 13 mm. Take care not to drill through the front face.
Mount the Base Plate: Fix the cruciform mounting plate to the carcase. Use System 32 spacing (32 mm hole spacing, 37 mm setback from the front edge) if your carcase has pre-drilled holes.
Hang and Adjust the Door: Clip the hinge onto the mounting plate (for clip-on systems) or fasten it with screws. Adjust the door via the 3D adjustment screws (height, lateral, depth) on the hinge arm until the gaps are parallel.

FAQ – Frequently Asked Questions About Planning Eaves Cupboards

Which hinge do I need for a 45-degree sloped ceiling? You need a dedicated 45-degree angled hinge. This compensates for the non-standard carcase angle, ensuring the door closes flush with the slope and opens without collision.

What is the maximum recommended depth for an eaves cupboard? This depends on the room's geometry. In the lower section, depths of 500 mm to 600 mm are common to maximise usable space. Full-extension runners should always be used at these depths to keep the rear space accessible.

Can I use standard concealed hinges under a slope? No, not if the carcase panel where the hinge is mounted is not at a 90-degree angle to the door front. A standard hinge would bind or prevent the door from closing properly.

Which drawer runners are best suited for deep eaves units? Full-extension runners with a nominal length of 450 mm or more. If storing heavy items, ensure a high dynamic load capacity (35 kg or above) and a sturdy ball-bearing runner design.

How do I level out an uneven attic floor? Use height-adjustable plinth feet. These screw under the base panel and allow millimetre-precise height adjustment via a threaded bolt before the plinth fascia is clipped on.

Matching Products & Categories

For the professional assembly of your eaves cupboard, find the correct mechanical components in our dedicated categories. Plan your fittings precisely according to the measured angles and depths.