Wine Cellar and Wine Room Installation in London: A Practical Guide

For serious collectors, the way wine is stored determines whether a bottle reaches its potential. Temperature fluctuation is the most damaging factor — not low temperatures, but variation. A consistent 12–14°C is ideal. Humidity matters too: too low (below 50%) and corks dry out, allowing oxidation; too high (above 80%) and labels degrade and mould develops. Light — particularly UV — degrades wine through photochemical reactions. Vibration, much discussed and often overstated, is a secondary concern.

A proper wine cellar addresses all of these. This guide covers the options, what the work involves, and realistic costs for London properties.

Types of wine storage installation

Passive cellar (basement or underground) A well-insulated underground space can maintain stable temperatures without active cooling if the thermal mass is sufficient and insulation is correct. In London, ground temperature at cellar depth is typically 10–12°C — cooler than ideal but acceptable for medium-term storage. A passive cellar works if the space is genuinely below-grade on all sides, properly insulated, and airtight enough to stabilise humidity.

Actively cooled wine room A dedicated room — basement, undercroft, or converted ground-floor space — with a wine cooling unit maintaining set temperature and humidity. This is the standard approach for a serious collection. Wine cooling units from Fondis, Transtherm, or EuroCave operate similarly to a refrigeration unit but are designed for the narrow temperature band and higher humidity requirements of cellaring.

Wine cabinet or climate-controlled rack system For collections of under 500 bottles, a purpose-built wine cabinet (EuroCave, Liebherr, or similar) is the most practical solution. These are self-contained, require no building work, and perform reliably. The limitation is capacity and the visual presence of a large appliance.

Cellar conversion In properties with existing basement space not currently used for cellar purposes, conversion involves: insulation, a concrete or tile floor, racking (custom or modular), cooling unit, drainage, and lighting. This is the most common approach in London townhouses.

The build: what is involved

Insulation The cellar must be thermally isolated from the rest of the building. This typically requires insulating all walls, ceiling, and floor with closed-cell spray foam or rigid insulation (PIR boards). The standard for a well-performing cellar is a minimum 100mm of PIR on walls and ceiling. Thermal bridging at the door frame and service penetrations must be addressed.

The door The cellar door is critical. A standard interior door is hopelessly leaky. A proper cellar door is heavily insulated (equivalent to an external door U-value), with compression seals around all four edges and a threshold drop. Many cellar specialists supply purpose-built cellar doors. Budget £800–£2,500 for a quality cellar door.

Cooling unit A through-wall split cooling unit (similar to a through-wall air conditioning unit) is the standard for most cellars. The unit sits at the top of the cellar wall with its condenser on the exterior (or in an adjacent space). Sizing is by heat load calculation: the unit must remove the heat gain through the insulated envelope plus any internal heat sources. Undersizing leads to the unit running continuously and wearing out prematurely.

For larger cellars or where exterior wall penetration is not possible, a ducted split system with remote condenser is the alternative.

Racking Racking is almost always custom-designed for the space. Materials: clear pine or redwood (traditional, low cost), dark-stained hardwood (premium appearance), steel and timber composite, or all-steel. A modular system allows reconfiguration as the collection changes. Built-in racking — floor-to-ceiling, designed for the dimensions of the room — is the most efficient use of space and the best aesthetic.

Lighting Wine cellars should use LED lighting only (no UV output). Ideally motion-activated, to minimise total light exposure. Recessed LED downlights with diffusers are standard.

Drainage A floor drain is worth including during construction — a cooling unit condensate line must go somewhere, and a drain allows for periodic cleaning.

Planning and permissions

A cellar conversion within the existing building envelope requires no planning permission. If the work involves a new basement or underpinning, that requires structural engineering and building control approval, and may trigger party wall obligations.

Realistic costs

ASAAN has incorporated wine cellar design and installation into basement and whole-property renovation programmes. If you are considering a wine cellar as part of a larger project, our team can coordinate the specialist trades involved.