Golders Green & Child's Hill Architect Guide: Extensions and Renovation in NW11/NW2

Introduction

Golders Green and Child's Hill sit in the northern arc of the borough boundary between Camden (to the south and west) and Barnet (to the north and east). The NW11 and NW2 postcodes are dominated by 1930s semi-detached houses and inter-war detached properties — a very different built environment from the Victorian terraces of neighbouring NW3 and NW5. Extensions and loft conversions in this area are common and generally achievable, but the planning context varies depending on which borough your property sits in and whether it falls within Hampstead Garden Suburb's tightly controlled conservation zone. This guide explains what homeowners need to know before appointing an architect in Golders Green or Child's Hill.

Planning Context: Camden vs Barnet

The borough boundary runs roughly through the middle of this area, so the first step for any homeowner is to confirm which authority governs their property. Camden and Barnet have different Local Plans, different fees for pre-application advice, and different interpretations of acceptable design in residential extensions.

Camden Properties in NW2/NW11

Properties in Child's Hill that fall within Camden are governed by Camden's SPD on Design (CPG1). Camden tends to be more prescriptive about materials and massing, requires Design and Access Statements for most planning applications, and offers a pre-application advice service at £100–£400. Camden-side properties in NW2 are generally outside conservation areas, which means permitted development rights apply more broadly.

Barnet Properties in NW11

The majority of Golders Green falls within Barnet. Barnet's Residential Design Guidance SPD is less prescriptive than Camden's but still sets out clear expectations for extension massing, roof form and materials. Barnet's pre-application advice costs £300–£600 for residential extensions. For properties close to the Hampstead Garden Suburb boundary, Barnet planning officers pay particular attention to proposals that might affect the visual character of the suburb from surrounding streets.

Hampstead Garden Suburb

Properties within the Hampstead Garden Suburb itself are subject to an additional layer of control administered by the Hampstead Garden Suburb Trust. The Trust maintains a separate consents process alongside the standard Barnet planning application, and has very specific requirements for roof form, materials, boundary treatments and extensions. Any changes to a Suburb property — including rear extensions not visible from the street — require Trust consent. See our dedicated guide on Hampstead Garden Suburb architecture and planning for full details.

Common Projects in Golders Green and Child's Hill

Extending 1930s Semi-Detached Houses

The characteristic property type in NW11 and NW2 is the 1930s semi-detached house — typically three or four bedrooms, with a side garage or alley and a generous rear garden. Common extension strategies include:

• Rear wrap-around extension: Removing the garage and extending across the rear at single-storey level creates a wide, open-plan kitchen and dining area. Costs typically run from £70,000–£120,000.
• Two-storey side and rear extension: Adding a two-storey extension to the side of the house — where the garage stood — adds a bedroom above and a family room or utility below. These are larger projects costing £110,000–£180,000 and require full planning permission.
• Single-storey rear extension only: A more modest scheme extending the rear of the house by 3–5m, typically containing an open-plan kitchen and dining room. Costs from £50,000–£85,000.

Read our dedicated guide to extending 1930s semi-detached houses for a full breakdown of planning requirements and design options.

Loft Conversions

The 1930s semi-detached house typically has a hip-and-gable roof that does not lend itself naturally to a simple rear dormer. A hip-to-gable conversion — flattening one side of the hip to create a vertical gable wall — is often the first step, followed by a rear dormer for bedroom space. Combined, this scheme adds two bedrooms and a bathroom at loft level. Costs run from £55,000–£90,000. Planning permission is usually required for the hip-to-gable conversion even where a rear dormer might fall within permitted development.

Basement Extensions

Child's Hill properties on the Camden side can pursue basement extensions under Camden's CPG6 basement policy. Golders Green properties in Barnet face different but generally less restrictive policies. Basement costs in this area run from £110,000–£260,000 depending on size and ground conditions. The relatively larger plots and garden sizes in NW11 make basements more viable here than in inner-city streets.

Choosing an Architect for NW11/NW2

• Borough experience: Confirm whether your property is in Camden or Barnet and select an architect with a track record in the relevant authority.
• 1930s property knowledge: Inter-war houses have different structural characteristics from Victorian terraces — cavity walls rather than solid brick, different floor joist arrangements, steel lintels rather than timber. Your architect should understand these details.
• Hampstead Garden Suburb Trust: If your property is within the Suburb boundary, only appoint an architect who has submitted and received approval from the Trust before — the consent process has specific requirements that are not widely understood.
• Fees: Architect fees for NW11 projects typically run 10–14% of construction costs for a full service. See our guide to architect fee models.

Cost and Planning Summary

Cost guidance for north London renovations is available at hampsteadrenovationcosts.co.uk.

Conclusion

Golders Green and Child's Hill offer excellent scope for home improvement, with generous plot sizes and property types that respond well to extensions and loft conversions. The borough boundary adds a layer of complexity, and the proximity to Hampstead Garden Suburb means some properties face additional consent requirements. Working with an architect who knows both Camden and Barnet planning systems and has experience with 1930s semi-detached houses will make your project significantly more straightforward. Use our free matching service to find an experienced Golders Green architect matched to your specific project type and budget.