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Planning applications, conservation guidance and architectural services across London Borough of Barnet
Horizon Architecture provides planning, extension, loft conversion and technical drawing services across Barnet, with active council monitoring and coordination from survey to decision.
Article reviewed 1 August 2026
LOCAL PLANNING / Barnet
Barnet’s Article 4 guidance makes a useful distinction between controls on changing a building’s use and controls protecting conservation areas. The borough-wide direction for conversion from a dwellinghouse to a small HMO does not, by itself, answer whether a rear extension or roof alteration is permitted development. Match the proposed operation to the actual direction and check any conditions attached to previous permissions.
The council’s conservation-area guidance identifies areas with additional Article 4 controls and provides the route into local heritage information. For an extension, start with the precise boundary and the relevant area’s character guidance. Avoid assuming that every house sharing a neighbourhood name has the same restrictions, or that a property outside a conservation area is free of other planning constraints.
Before settling a loft layout, record the existing roof silhouette, chimneys, ridge and eaves, and photograph the house with its immediate neighbours. For a side extension, a measured street elevation can show whether the proposal would erode the space between houses. These are useful preparation steps for explaining the design; they are not a substitute for checking the applicable policy or a promise that a particular width will be accepted.
If the brief includes both extending and changing how the house is occupied, assess those elements together but identify their separate planning routes. Keep evidence of the lawful existing use, proposed room arrangements and external alterations in one coordinated set. Where trees contribute to a conservation setting, identify them early so that a footprint is not fixed before their implications are understood.
Householder decisions: eight-week national target after validation, with longer times possible.
Explore our North London home refurbishment and North London extension and loft design. These are design references from the wider region, rather than confirmed projects in this borough. Each new proposal needs its own site assessment and consent route.
Barnet: Article 4 Directions · Barnet: conservation areas · GOV.UK: determining a planning application
Fees are starting prices and depend on property size, complexity, location and scope. Statutory application charges, Planning Portal charges, Building Control fees, specialist consultants and VAT where applicable are additional.
These are authority-wide figures for the year ending 31 March 2026. Applications received and decisions issued are separate flows: a decision in the period may relate to an application received earlier. The official return combines several planning application routes and does not provide a reliable borough total limited only to full applications.
The borough ranges from dense town centres to low-density garden suburbs and Green Belt-edge neighbourhoods. Scale, separation, roofscape and landscaping often carry substantial weight. The planning authority received 2,596 applications in the latest annual reporting period and issued 2,541 decisions. Of those decisions, 1,916 were granted and 625 were refused, equivalent to an authority-wide refusal rate of 24.6%. These totals provide useful context but do not predict the outcome of a specific property or proposal.
Approval depends on the site, planning history, Local Plan policies, the London Plan, permitted-development position, design quality, neighbour effects, heritage and environmental constraints. We review those matters before fixing the application strategy.
We aim to make the process effortless for the client. After submission we check whether the application has been validated, monitor the council register and key dates, and remain available to provide information that is reasonably required. Where the case officer identifies a specific concern and is willing to consider an amendment, we assess it quickly and coordinate an appropriate response rather than allowing avoidable delay.
London Borough of Barnet contains conservation areas including Hampstead Garden Suburb, Mill Hill, Totteridge, Monken Hadley, Wood Street, Finchley Church End and Golders Green. A conservation area does not prevent thoughtful change, but the council must give special attention to preserving or enhancing its character and appearance. This commonly affects roof alterations, dormers, front elevations, windows and doors, boundary walls, hardstanding, demolition, plant, materials, trees and development visible from public viewpoints.
A number of Barnet conservation areas are affected by Article 4 Directions. Hampstead Garden Suburb also has detailed design controls and estate requirements, so permitted development assumptions should not be made without checking the address.
For a property in or near a conservation area we review the relevant appraisal and management guidance, identify features that contribute to significance and explain how the proposed design responds. A heritage statement, schedule of materials, detailed joinery information, streetscape drawings or verified views may be needed depending on the project.
The borough includes suburban family houses, garden-suburb estates, Victorian and Edwardian terraces, detached villas and town-centre mixed-use buildings. Recurring planning considerations include side gaps, roof form, garden character, trees, locally distinctive materials and the effect of extensions on spacious suburban plots. The correct solution is therefore site-specific: a form of development that is acceptable on one street may be unsuitable on another because of plot pattern, designation, visibility, neighbour relationships or planning history.
We coordinate the architectural work with other disciplines where the planning authority or project requires them. This avoids fragmented information and gives the client one coordinated route through the process.
The principal statutory planning application fees are set nationally rather than by each London borough. From 1 April 2026, a typical householder application to alter or extend one house costs £548. Other development types use different calculations. Planning Portal service charges, council pre-application advice, Building Control, specialist reports and professional fees are separate.
Horizon Architecture charges £100 for planning application submission, with planning drawings starting from £1,400. We confirm the architectural scope, likely statutory fee and foreseeable specialist inputs before appointment.
Read the detailed neighbourhood planning guide.
View area guide →Read the detailed neighbourhood planning guide.
View area guide →No architect can guarantee a council decision. We improve the prospects through planning-history checks, policy analysis, proportionate design, complete documentation and active management after submission.
Yes. We monitor validation and determination, check the public record, remain available to the case officer, supply reasonable clarifications and respond quickly where a focused amendment could assist the application.
No. The official authority-wide applications-received series combines several planning routes. It does not publish a reliable annual borough total limited only to full applications, so we state the limitation rather than inventing a number.
From 1 April 2026, the nationally set statutory fee for alteration or extension of one house is £548. Planning Portal charges, council pre-application services and professional fees are separate.
Yes, subject to the agreed scope. We can coordinate structural engineering, heritage, acoustic, arboricultural, drainage, flood-risk, transport, daylight, fire, energy and building-services information.
Not automatically. The design must preserve or enhance the area’s character and respond to the appraisal, visibility, roof form, materials, historic fabric, trees and any Article 4 Direction.
Send us the property address, photographs and a short description of the proposed work. We will outline the likely planning route, key constraints, required drawings and an appropriate quotation.
Get a free quoteSelect another borough below. Every guide uses the same official reporting period and explains conservation controls, current statutory fees and Horizon Architecture’s active application-management service.
All London borough planning guides · Neighbourhood planning guides · Planning applications · Building Regulations drawings · Conservation area architect · Planning refusal help
Article updated 1 August 2026. Planning figures: MHCLG accredited official statistics. Conservation information: London Borough of Barnet guidance. Borough coverage: London Councils. Statutory fees: Planning Portal fee guidance. The exact address, designation, Article 4 status, validation requirements and current fee should always be checked before submission.
