Interior Designer · NW11, N2
Interior design in Hampstead Garden Suburb & The Bishops Avenue
Katherine Varnava Interiors is a luxury interior designer for homes and commercial spaces in Hampstead Garden Suburb & The Bishops Avenue. A BIID Registered Interior Designer® studio based in Mayfair, London, it offers full interior design, technical design and bespoke joinery, FF&E procurement and a single design-and-build service, with Katherine personally involved in every project.
Homes in Hampstead Garden Suburb & The Bishops Avenue
Hampstead Garden Suburb is an early 20th-century planned suburb where changes to houses are controlled both by Barnet Council and by the Hampstead Garden Suburb Trust under its Scheme of Management. The Bishops Avenue, on the Suburb's eastern side in N2, lies within the same conservation area but mostly outside the Trust's Scheme. Interior work here often means respecting original plans and joinery while bringing kitchens, bathrooms and services up to date.
The conservation area character appraisal records the greatest concentration of statutory listed buildings in the borough: two Grade I, forty one Grade II* and seven hundred and forty Grade II. Character areas run from the Artisans' Quarter and Central Square to Meadway, Wildwood Road, Winnington Road and Spaniards End. Barnet's appraisal of The Bishops Avenue describes a road laid out around 1887 with building from 1894 and about 110 properties, originally mainly vernacular revival and Arts and Crafts, later joined by Neo-Georgian, Neo-Jacobean and 'Hollywood Tudor' houses and large rebuilds. Interior projects range from careful work in listed houses to full design and fit-out of very large new or rebuilt homes.
How the studio works
Every project, from a single room to a whole house or a commercial space, follows the same five-stage, RIBA-aligned journey: Define, Develop, Resolve, Deliver and Complete. The studio works alongside your architect and contractor, or delivers a single design-and-build service from concept to completion.
- Full interior design, from a single room to a whole house
- Interior architecture and spatial planning
- Technical design and bespoke joinery
- Lighting design
- FF&E design, procurement and installation
- Commercial interiors
- Design and build, or alongside your architect and contractor
The studio takes on projects across NW11, N2, including streets such as Hampstead Way, Meadway, Wildwood Road, Winnington Road and Ingram Avenue.
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Before you start in Hampstead Garden Suburb & The Bishops Avenue
The consents and local rules that most often shape an interior project here, each linked to its official source. The studio checks them for your property at the start, so they are planned into the design and the programme.
The joint Trust and Barnet Council design guidance states that leaseholders need Trust consent for external and internal alterations where these are controlled by clauses in the lease, and that internal works on other properties may be controlled under clauses in the lease or freehold transfer. Structural works inside buildings leased from the Trust also need Trust consent.Source: open.barnet.gov.uk
The same guidance states that listed building controls apply to all works, both external and internal, that would affect a building's special interest, and that interior plans and individual features of interest should be respected and left unaltered as far as possible. Listed Building Consent from Barnet Council is required before any internal alterations to a listed building.Source: open.barnet.gov.uk
The Trust's retrofit guidance (first published 2024, revised 2026) states that secondary glazing does not require Trust Consent and lists internal wall insulation among measures that do not need it. It notes that listed buildings may also require Listed Building Consent for internal and external work, and that leaseholders may require consent for internal retrofit alterations.Source: hgstrust.org
The Hampstead Garden Suburb character appraisal states that the Trust's Scheme of Management covers neither Golders Green Crematorium nor most of The Bishops Avenue, although both lie within the Hampstead Garden Suburb Conservation Area managed by Barnet Council. Barnet's planning and listed building controls still apply along the road.Source: hgstrust.org
Barnet's Construction Site Guidelines for Householders and Developers limit noisy work audible at the site boundary to 8am to 6pm Monday to Friday and 8am to 1pm on Saturday, with no work on Sundays or bank holidays. Work outside these hours needs prior approval, given only in exceptional circumstances.Source: hgsra.uk
The Hampstead Garden Suburb Trust requires its prior approval before the external appearance of a property is altered, and offers free pre-application advice by email to [email protected]. Applications use its Application for Trust Consent form, and the Trust may arrange a site visit.Source: hgstrust.org
Questions
Interior design in Hampstead Garden Suburb & The Bishops Avenue
Does the Hampstead Garden Suburb Trust need to approve internal alterations?
Sometimes. The joint Trust and Barnet design guidance says leaseholders need Trust consent for internal alterations where their lease controls them, and that internal works on other properties may be controlled by clauses in the lease or freehold transfer. Structural works inside buildings leased from the Trust also need consent. We check the title documents and lease at the start, so any Trust consent runs alongside the design rather than after it.Source: open.barnet.gov.uk
Is The Bishops Avenue covered by the Hampstead Garden Suburb Trust?
Mostly not. The Hampstead Garden Suburb character appraisal states that the Trust's Scheme of Management does not cover most of The Bishops Avenue, although the road lies within the Hampstead Garden Suburb Conservation Area, which Barnet Council manages. Barnet's planning and listed building controls therefore still apply. For any house on the road we confirm early whether Trust consent, planning permission or listed building consent is needed for the proposed works.Source: hgstrust.org
Can I add secondary glazing to my house in the Suburb?
In most cases, yes. The Trust's retrofit guidance, first published in 2024 and revised in 2026, says secondary glazing is cheaper than wholesale window replacement and does not require Trust Consent, and it lists internal wall insulation among measures that do not need it either. Listed houses may still need Listed Building Consent, and leaseholders may need consent for internal retrofit work. We design secondary glazing to sit discreetly within existing reveals.Source: hgstrust.org
Do you take on single rooms as well as whole houses in Hampstead Garden Suburb & The Bishops Avenue?
Yes. Projects range from a single room, which can also be designed remotely through the Virtual Studio, to whole-house refurbishments, new builds and commercial spaces. Every project follows the same five-stage, RIBA-aligned process: Define, Develop, Resolve, Deliver and Complete.
Can you manage the build as well as the design?
Yes. The studio can work alongside your architect and contractor, providing contractor coordination and design oversight on site, or deliver a single design-and-build service that takes the project from concept to completion.
Will Katherine be involved personally?
Yes. Katherine Varnava, a BIID Registered Interior Designer®, leads every project herself. The studio takes on a deliberately limited number of projects each year so that she stays involved in every detail, from concept to completion.
Updated 17 October 2026
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