Will I need building regulations approval for under-stairs cloakroom?

Yes — installation triggers Approved Document G (sanitation) and Approved Document F (ventilation). A building notice to local Building Control is typical (£250–£550 fee); Builderr handles the application. Required spec: mechanical extract fan (15 l/s minimum); 24-hour humidity sensor on the extract; tiled or impervious floor finish; minimum 1.8m head height at the door entry; access for maintenance to all soil connections.

Does under-stairs storage affect house value?

Yes — measurably. Bespoke under-stairs joinery adds £8,000–£18,000 to sale value of a London 3-bed terrace. A cloakroom WC adds £18,000–£35,000. Pull-out drawer storage and boot rooms add £6,500–£14,500. Estate agent feedback (Foxtons, Knight Frank prime London 2024–2026): bespoke joinery is one of the strongest 'lived-in detail' signals to viewers; freestanding furniture under stairs is a downgrade signal.

Can I add under-stairs storage in a leasehold flat?

Usually yes — under-stairs joinery is typically considered an internal alteration not affecting building structure; landlord consent generally not required, but check your lease. Cloakroom WC installation is more sensitive — new plumbing to the building's soil stack is a structural alteration; landlord consent typically required, possibly with consent fee £450–£1,500 and a deed of variation.

What about the gas meter or electrical consumer unit?

Many London terraces have the gas meter, electricity consumer unit and incoming services located under the staircase. Joinery design must respect access requirements: 1.0m clear access to gas meter (Gas Safe regulations); 600mm clear access to consumer unit; meter readers, fitters and emergency services must reach these without dismantling cabinetry. Builderr's design provides hinged or removable access panels — the joinery looks continuous when closed but allows full service access when needed.

Under-Stairs Storage Cost London 2026 | Builderr

How Much Does Bespoke Under-Stairs Storage Cost in London?

Bespoke under-stairs storage in a London renovation costs £1,800–£8,500. Pull-out drawer banks £1,800–£3,500; under-stairs cloakroom WC £4,500–£8,500; boot-room style coat-and-shoe storage £2,500–£5,500. Most cost-effective space recovery in any 2-storey London home — typically 1.5–2.5m² of usable storage reclaimed.

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Storage options that fit under London staircases

Most London terrace and townhouse staircases sit between living spaces with 1.5–2.5m² of underused volume below the rising stair. Five primary uses. Pull-out drawer bank (kitchen pantry overflow or hallway storage) £1,800–£3,500; vertical wine storage with wine-fridge integration £3,500–£8,500; cloakroom WC and basin £4,500–£8,500; boot room and coat storage with seating £2,500–£5,500; concealed dog-bed nook and feeding station £900–£2,400 (popular brief on 2024–2026 family renovations). Selection depends on adjacent space: hallway-with-kitchen-behind → pantry pull-outs; hallway-only → boot room or cloakroom; living-room-with-stair → wine or media storage. Builderr's joinery team designs all variants from a 3D laser scan of the stair underside (essential — angles vary across every London staircase) at week 4–6 of design package preparation.

Cloakroom WC under the stairs — design and cost

Cloakroom WC under a typical Victorian or Edwardian staircase is the highest-impact under-stairs use — adds a half-bathroom (resale value) and removes the need for guests to use the main bathroom. Minimum dimensions: 0.8m wide × 1.4m long × 1.8m head height at the door (sloping down to 1.4m at deepest point). Spec components: compact WC (Roca, Ideal Standard, Catalano) £180–£450; wall-mounted basin £180–£600; basin tap and trap £80–£250; LED lighting and extract fan £150–£400; tile and plaster finishes £1,200–£2,500; plumbing connection to existing soil stack £900–£2,200; door (often sliding pocket) £400–£1,200. Total £4,500–£8,500 supplied and installed. Resale: Knight Frank London 2025 — addition of a cloakroom WC typically adds £18,000–£35,000 to sale value of a 3-bed terrace; one of the highest-ROI renovation moves.

Pull-out and drawer storage — the workhorse option

Bespoke pull-out drawer banks under the stairs are the most flexible storage option. Typical configuration: 3–5 deep pull-out drawers ranging from 600–1100mm width (graduated to fit the sloping underside), 600mm depth, 300–500mm height. Drawer slides: Blum Tandembox or Hettich AvanTech — 60kg load rating, soft-close. Cabinet construction: 18mm birch ply or painted MDF carcass; oak veneer or painted MDF drawer fronts. Cost £1,800–£3,500 for 3–5 drawer bank installed. Pull-out is dramatically more usable than fixed under-stairs cupboards (which require kneeling and forward reach) — recovers near-100% of the volume as accessible storage. Mid-spec finish (painted MDF in Farrow & Ball, brass handles) £2,500–£3,200; premium finish (oak veneer, push-to-open handle-less, integrated LED) £4,500–£6,500. Frequently combined with a flush-fronted cupboard at the tallest end for vacuum cleaner / coats.

Specification details that matter

Three details to specify carefully. Detail 1: structural take-off of the stair — staircase strings, treads and risers are rarely square; a 3D laser scan (£300–£600) gives the joiner exact dimensions and avoids costly site-fit adjustments. Standard tape-measure surveys produce 5–10mm fit gaps. Detail 2: ventilation if used for shoes, sports kit or food storage — passive ventilation grille (50mm × 200mm) in the joinery face, or fan-assisted extraction for cloakroom/dog use; without ventilation, shoes and pet beds develop odours within months. Detail 3: lighting — integrated LED strip lighting on a motion sensor for drawer interiors; concealed LED for cloakroom; ceiling-recessed downlights for boot room. Lighting transforms usability; the cost (£150–£400) is small relative to the joinery investment. Builderr's design package specifies all three details at concept stage — avoids the most common owner complaints (gaps, smells, dark interiors) on completed under-stairs joinery.