Listed Buildings in London: Works, Consent and Renovation Guide

A Listed Building is a building included on the National Heritage List for England (NHLE), maintained by Historic England. Listed Buildings are protected because of their special architectural or historic interest. There are three grades:

• •**Grade I:** Buildings of exceptional interest — approximately 2.5% of all listed buildings nationally. In London: major historic structures (Royal Palaces, major churches, iconic Georgian and Victorian public buildings)
• •**Grade II* (pronounced 'Grade Two Star'):** Particularly important buildings of more than special interest — approximately 5.5% of all listed buildings. In London: many significant residential and institutional buildings
• •**Grade II:** Buildings of special interest that justify preservation — approximately 92% of all listed buildings. The vast majority of Listed Buildings that homeowners own in London are Grade II.

• **What is protected?**
• The listing protects the building in its entirety — not just the exterior or the principal rooms. This includes:
• •The exterior and interior
• •Any outbuildings, structures, and garden walls within the curtilage of the listed building that were there when the building was listed
• •Fixtures and fittings that are part of the building (fireplaces, panelling, historic tiles, original staircases)

**Grade II listing does NOT mean the building cannot be altered.** It means that any works that would affect its special historic or architectural character require Listed Building Consent. Many changes that are permitted development for unlisted properties (and do not even require planning permission) require LBC for a Listed Building.

Listed Building Consent (LBC) is required for any works to a Listed Building that would affect its character as a building of special architectural or historic interest. This is a wide test — it covers both exterior and interior works.

**Works that typically require LBC for a Grade II listed dwelling in London:**

• **Exterior:**
• •Replacing windows — even replacing like-for-like in the same materials. Replacing original sash windows in a listed property requires LBC (and planning permission where the property is also in a Conservation Area)
• •External painting (changing the colour of stucco or rendering on a listed building requires LBC in many cases)
• •Re-roofing where it changes the character of the roof
• •Adding a satellite dish, solar panels, or air source heat pump to the exterior
• •Removing or altering historic chimney stacks
• •External extensions or additions

• **Interior:**
• •Removing or altering internal walls where they are original and of historic significance
• •Altering original fireplaces, surrounds, or hearths
• •Removing original joinery (doors, panelling, skirtings, architraves)
• •Removing or altering historic floor surfaces (original tiles, stone, wide-board timber)
• •Removing or altering a historic staircase
• •Altering the plaster ceiling (especially ornate historic plasterwork)
• •Installing new structural openings or removing historic structural fabric

• **Works that generally do NOT require LBC:**
• •Internal decoration (painting, wallpaper) where no historic fabric is damaged
• •Like-for-like maintenance repairs using matching materials (repointing in matching lime mortar, slating, replacing like-for-like)
• •Installing fitted furniture that does not damage historic fabric
• •General cleaning

**Important:** The test is whether the works 'affect the character.' This is subjective and context-dependent. If in doubt, contact the local planning authority's conservation officer for informal guidance before committing to any works.

• **Applying for Listed Building Consent:**
• LBC is a separate consent from planning permission, though the two are often applied for simultaneously where both are required. The application is made to the Local Planning Authority. LBC applications require:
• •A description of the proposed works
• •Plans and elevations showing the existing and proposed states
• •A Heritage Statement (also called a Design and Access Statement or Heritage Impact Assessment) explaining why the works are justified and how they respect the special interest of the building
• •Photographs of the existing fabric

The LBC application fee is currently £206 (there is no application fee for LBC in England — it is free to apply, as of 2026, though this may change).

The determination period is 8 weeks (as with a householder planning application). Historic England is a statutory consultee for Grade I and Grade II* applications; for Grade II, the local conservation officer typically leads the assessment.

**Conditions:** LBC is often issued with conditions that control the materials to be used (e.g., lime mortar, specific timber species for window frames), require samples to be approved before works start, and require the conservation officer to inspect at key stages.

**Using a conservation specialist:** For Listed Building projects, using an architect with conservation experience (ideally AABC registered — Architects Accredited in Building Conservation) is strongly recommended. Conservation specialists understand what the local planning authority is likely to require and can design solutions that are both practically effective and acceptable in heritage terms.

• **Cost premium for Listed Buildings:**
• Listed Building renovation typically costs significantly more than equivalent works on an unlisted property:
• •Lime mortar repointing (instead of cement): 30–50% more expensive but required for most Grade II listed masonry
• •Timber window restoration (instead of replacement): £500–£1,500 per window for restoration + secondary glazing vs. £400–£800 for standard double-glazed unit replacement
• •Heritage insulation solutions (insulating without condensation risk or damage to historic fabric): significantly more expensive than standard insulation
• •Conservation officer fees, heritage statements, and specialist surveys: additional procurement and consent costs

• **Energy efficiency in Listed Buildings:**
• Installing energy efficiency measures in Listed Buildings requires careful design to avoid condensation damage to historic fabric. Many conventional insulation approaches (internal wall insulation, external wall insulation, standard double glazing) are not appropriate for listed buildings. Solutions include:
• •Secondary glazing (a separate glazed panel inside the existing window) to improve thermal performance without altering the original window
• •Blown fibre insulation to accessible roof voids using minimal-impact installation methods
• •Draught-proofing of existing sash windows (a very cost-effective measure that does not require LBC where it does not damage existing fabric)
• •Air source heat pumps located where not visible from the public realm