From Concept to Planning Approval: A Complete Guide for UK Homeowners

You've decided you want to extend your home, build a new house, or undertake a significant renovation. You know you need an architect and you suspect you'll need planning permission — but beyond that, the process feels opaque. What actually happens, in what order, and how long does it take?

This guide sets out the full journey: from the moment you first speak to an architect through to the moment your planning permission is granted and you're ready to build. It's written for homeowners who want to understand the process clearly, without jargon — so that they can engage with it confidently and make better decisions at every stage.

What Is a Planning Application?

Before anything else, it's worth being precise about what a planning application actually is. A planning application is a formal request submitted to your local planning authority (LPA) — typically your district or borough council — asking for consent to carry out development. It is accompanied by a set of planning documents: drawings, a design and access statement, and various supporting reports depending on the nature and location of the project.

The LPA assesses your application against national planning policy (the National Planning Policy Framework, or NPPF) and its own local plan. It considers factors including design quality, impact on neighbours, scale, visual character, ecological impact, and highway access. The outcome — permission granted or refused — is a matter of planning judgement, not simply a technical pass or fail.

Understanding what a planning application is — and what it is not — helps set realistic expectations. It is not a guaranteed process with a predetermined outcome. It is a conversation, mediated by policy, between your proposal and the local planning authority's view of what is appropriate for your area.

Do You Need Planning Permission?

Not every building project requires a formal planning application. Many common domestic projects — certain rear extensions, loft conversions, outbuildings, rooflights — may fall within Permitted Development (PD) rights. Planning permitted development is a form of automatic consent that applies to residential properties in England, subject to specific limits on size, height, siting, and materials.

However, PD rights are subject to numerous restrictions and exceptions. Properties in Conservation Areas, Areas of Outstanding Natural Beauty, National Parks, or World Heritage Sites have significantly reduced PD rights. Listed buildings have none. And some new-build developments are sold subject to Article 4 Directions, which remove PD rights entirely.

One of the first things a good architect will do is assess what your property can do under Permitted Development before recommending whether a full planning application is required. This assessment can save significant time and cost — or it can identify that the project is more constrained than you expected, which is equally important to know early.

Even where PD applies, larger single-storey rear extensions under the Householder Prior Approval route still require a formal notification to the LPA, and neighbours must be consulted. This is not a planning application, but it is a process — and it requires proper preparation.

The Architectural Design Process: An Overview

Whether or not planning permission is needed, every successful building project begins with a rigorous architectural design process. The architectural stages of design follow a broadly consistent sequence, and understanding them helps you know what to expect — and what decisions you'll be asked to make — at each point.

The RIBA Plan of Work (published by the Royal Institute of British Architects) defines eight stages of the architectural process, from initial briefing through to post-occupancy review. For most residential projects, the stages that matter most are:

Stage 1: Preparation and Briefing — defining what you want, understanding the site, and establishing the project budget and programme
Stage 2: Concept Design — developing the initial design ideas and testing them against the brief
Stage 3: Spatial Coordination — developing the design in detail, coordinating structure and services, and preparing the planning drawings
Stage 4: Technical Design — producing the full technical specification and construction drawings for building regulations and tender
Stages 5 & 6: Manufacturing and Construction — the build itself, managed with architect oversight

For the purposes of obtaining planning permission, Stages 1 through 3 are the most relevant. Here's how each one works in practice.

Stage 1: Preparation and Briefing

The architectural design process begins not with drawings but with listening. A thorough briefing process is the foundation on which everything else is built — and it is where the best architects invest the most time.

During this stage, your architect will explore how you live, what you need from the project, what budget you're working to, and what timescales you're hoping to achieve. They will visit the site, carry out measured surveys (or commission them from a specialist surveyor), and assess the planning context thoroughly.

This is also the stage at which important scoping decisions are made. Is the project likely to require planning permission, or can it proceed under Permitted Development? Is it in a sensitive planning area — a Conservation Area, for example — that will require additional care and consultation? Are there likely to be heritage, ecological, or highway constraints that will need specialist input?

Getting these questions answered early prevents expensive surprises later. The time spent in briefing is never wasted.

Stage 2: Concept Design

With the brief established and the site thoroughly understood, the architect moves into concept design: the stage at which the big ideas for the project are developed and tested.

This is the most creatively intensive part of the architectural stages of design. The architect explores different approaches to the project — how the building sits on the site, how spaces are arranged, how the building relates to its neighbours and landscape, what it looks and feels like. Ideas are developed through sketches, diagrams, and physical or digital models, then tested against the brief and refined in response to your feedback.

Good concept design is not about producing one idea and refining it. It is about genuinely exploring the design space — considering multiple options, understanding their relative merits, and arriving at a clear preferred approach that can be confidently developed further.

At the end of Stage 2, you should have a clear design concept that you're genuinely enthusiastic about — one that meets your brief, responds to the site, and has a strong planning rationale.

Stage 3: Spatial Coordination and Planning Preparation

Stage 3 is where the concept is developed into a planning proposal. This is the core of the architectural planning work — translating design ideas into the precise, formally presented drawings and documents required for a planning application submission.

Architect Planning Drawings

The planning drawings package typically includes:

Location plan — showing the site in context, usually at 1:1250 or 1:2500 scale
Site plan — showing the site boundaries, the existing building, and the proposed development, usually at 1:500
Existing floor plans and elevations — accurately measured drawings of the building as it exists
Proposed floor plans — showing the new or altered layout at 1:100 or 1:50
Proposed elevations — showing all faces of the building, including materials notation
Proposed sections — cutting through the building to show internal heights and relationships
3D visualisations — increasingly required by LPAs and invaluable for communicating the design to planning officers and committees

These architect planning drawings are not simply technical documents — they are also a form of communication. They must convey the quality and character of the proposal clearly enough that a planning officer who has never visited the site can assess it accurately.

Planning Documents

In addition to drawings, most planning applications require a suite of supporting planning documents. The most important of these is the Design and Access Statement — a written document that explains the design rationale, demonstrates how the proposal responds to its context, and addresses any specific planning policy requirements.

Depending on the project and location, additional reports may be required: a heritage statement for listed buildings or Conservation Area sites, an arboricultural report where trees are affected, an ecological survey where protected species may be present, a flood risk assessment for sites in flood zones, or a transport statement for larger developments.

Assembling the full planning documents package is a significant piece of work, and it's one that distinguishes a well-prepared application from a poorly prepared one. Applications that arrive at the LPA incomplete or with inadequate supporting information are frequently delayed or refused on procedural grounds before the planning merits are even considered.

Pre-Application Engagement

Before submitting a planning application, it is almost always worth engaging with the local planning authority in a pre-application discussion. Most LPAs offer a formal pre-application advice service (for a fee), through which you can present your emerging proposal to a planning officer and receive feedback before the formal application is made.

This pre-application stage is not a guarantee of success — the officer's advice is informal and does not bind the authority's eventual decision. But it is enormously valuable. It allows you to understand the authority's likely concerns, adjust the design in response to those concerns, and arrive at the formal submission with greater confidence that the proposal is acceptable in principle.

We engage in pre-application discussions on virtually all of our planning projects. The time and cost involved is always repaid — either by identifying a straightforward path to approval or by surfacing issues early that would otherwise have caused problems mid-application.

The Planning Application Process

Once the design is finalised, the drawings and supporting documents are complete, and any pre-application feedback has been incorporated, the application is ready for formal submission.

Planning Application Submission

Planning applications in England are submitted through the Planning Portal (planningportal.co.uk), the national online gateway for planning applications. The application form requires detailed information about the proposed development, the applicant, the site, and various technical matters. It must be accompanied by the full drawings package, supporting documents, and the relevant application fee.

The LPA has a statutory period in which to determine the application: 8 weeks for householder applications (extensions, alterations to existing dwellings), 13 weeks for larger or more complex applications. These timescales are frequently extended by agreement where additional information is required or where the application is particularly complex.

What Happens During the Planning Application Process?

Once validated (i.e., confirmed as complete by the LPA), the application is registered and a case officer is assigned. The case officer manages the application through to decision.

During the determination period, several things happen in parallel:

Consultation: The LPA notifies neighbouring properties, statutory consultees (highways, ecology, heritage, etc.), and — for larger applications — the wider public. Neighbours have a right to submit comments; these are considered but are not determinative in isolation.

Assessment: The case officer assesses the proposal against relevant planning policies, consulting internal specialists (design officers, arboricultural officers, etc.) as required. They may request additional information or minor amendments during this period.

Committee or delegated decision: Most householder applications are determined under delegated powers — decided by the planning officer without reference to committee. Larger or more contentious applications may be referred to the planning committee, which is a panel of elected councillors who vote on the decision.

Decision notice: The outcome is issued as a formal decision notice — either granting planning permission (with or without conditions) or refusing it (with reasons).

Planning and Building Control

It's important to note that planning permission and building control are entirely separate consents. Planning permission says you can build; building regulations (administered by building control) say how you must build. Both are required for most significant building projects, and neither substitutes for the other.

Building control is not part of the planning application process, but it runs in parallel with the technical design stage and the build itself. Your architect will prepare a full building regulations package — structural drawings, thermal calculations, fire strategy, drainage design — and submit this to a building control body (either the local authority or an approved private inspector) before work begins on site.

Obtaining Planning Permission: Timescales

One of the questions we're most frequently asked is: how long does it take to get planning permission? The honest answer is that it varies — but here are typical timescales for residential projects:

Brief and concept design: 4–8 weeks
Developed design and planning drawings: 4–8 weeks
Pre-application discussions (if pursued): 4–8 weeks (depending on LPA)
Planning application submission to decision: 8–13 weeks (statutory) — but often 12–16 weeks in practice
Discharge of pre-commencement conditions (if required): 2–4 weeks

In total, from initial appointment to planning permission granted, a straightforward householder application typically takes 4–6 months. A more complex application for a new build house — particularly one in a sensitive planning area — can take 9–15 months or more.

This timeline underscores the importance of starting the architectural design process early. If you're hoping to be on site by a particular date, work backwards from that date to understand when you need to appoint an architect and begin the process.

A Note on Planning in London

The planning application process in London follows the same national framework as the rest of England but operates within an additional layer of strategic policy. The Mayor of London's London Plan sits above individual borough local plans and sets strategic policies on housing, density, design quality, sustainability, and heritage. For larger developments — typically ten or more units, or exceeding certain height thresholds — the Greater London Authority (GLA) is a statutory consultee and may become directly involved in the determination process.

For most residential projects — extensions, alterations, single new-build houses — a planning application London follows the same process as elsewhere: submitted to the relevant London borough, assessed under local and national policy. Borough-level policies in London tend to be particularly stringent on design quality, and the density of the urban environment means that neighbour impact and daylight/sunlight assessments are more frequently required than in rural settings.

Getting Planning Permission: The Keys to Success

After many years of preparing and submitting planning applications for residential projects across Hampshire, Surrey, and beyond, we've identified the factors that most consistently distinguish successful applications from unsuccessful ones.

Quality of design. Planning officers are trained to assess design quality, and well-designed proposals are materially more likely to be approved. Good architecture is not just aesthetically valuable — it is strategically important.

Thorough contextual analysis. A proposal that demonstrably understands and responds to its context — in terms of scale, materials, massing, and relationship to neighbours — is far easier to argue for than one that appears to have been designed without reference to its surroundings.

Complete and well-prepared planning documents. An application that arrives with all required documents in place, clearly presented, and accompanied by a well-argued Design and Access Statement puts the case officer in a position to approve rather than defer.

Early engagement with the LPA. Pre-application discussions rarely harm an application and frequently improve the outcome significantly.

Responsive management during the process. Case officers often request minor amendments or additional information during the determination period. Responding quickly and constructively keeps the application moving and builds goodwill with the case officer.

From Planning Approval to Construction: What Comes Next

Planning permission is granted, conditions discharged, and you're ready to build. What are the house construction steps that follow?

The next phase of the architectural design process — Stage 4: Technical Design — involves the preparation of a full set of construction drawings and specifications. These are far more detailed than the planning drawings: they show every junction, every material interface, every structural connection, every service route. They are what your contractor prices from and builds to.

Once technical design is complete, the project goes out to tender — typically to three or four carefully selected contractors from our network. We evaluate the tender returns, interview the preferred contractors, and recommend appointment. Contract administration during the build involves regular site visits, certification of payments, management of any design changes, and ultimate sign-off at practical completion.

The home construction steps from planning approval to practical completion typically take 10–18 months for a substantial extension or renovation, and 18–30 months for a new build house.

Working with an Architect: Bespoke Residential Design

The process described in this guide is, in essence, the process of bespoke residential design — a sequence of carefully considered stages that takes a project from an initial idea to a beautifully realised building. It requires expertise, patience, and a genuine collaborative relationship between client and architect.

The reward — a home that has been designed specifically for you, your site, and the way you live — is something that no off-the-shelf solution can replicate. A home that has been through this process is not just better to look at. It is better to live in: more light-filled, more spatially generous, more connected to its landscape, more responsive to your needs.

If you're considering a project and would like to understand more about the planning application process or the architectural stages of design, we'd be delighted to have an initial conversation. Get in touch to arrange a consultation — there's no obligation, and it's always the most useful first step.