New Build Planning Permission London & Hertfordshire 2026: Complete Guide

Planning permission is always required for new build houses in London and Hertfordshire. Unlike house extensions which can sometimes be built under permitted development, a new dwelling always requires a full planning application to the local planning authority. Understanding the planning process, the factors that affect approval and how to present a strong application is essential to the success of any new build project. LCCL Construction manages all planning applications for new build projects as part of our complete design and build service.

LCCL Construction handles all planning applications for new build projects across London, Hertfordshire and Bedfordshire

Do You Always Need Planning Permission for a New Build House?

Yes — all new build dwellings require full planning permission. There are no permitted development rights for new houses. Planning permission must be obtained from the local planning authority before any construction work begins. Building without planning permission is a serious offence and can result in an enforcement notice requiring demolition of the unauthorised structure.

How Long Does New Build Planning Permission Take in London?

A standard full planning application for a new build house in London or Hertfordshire typically takes 8 to 13 weeks from submission to decision. This is the statutory determination period for applications that are not major development. Complex applications — particularly in conservation areas, on Green Belt land, on contaminated sites or for larger schemes — can take significantly longer and may require pre-application consultation with the planning authority before submission. LCCL Construction recommends pre-application consultation for all new build projects to identify potential issues before formal submission.

What Does a New Build Planning Application Include?

A full planning application for a new build house includes: site location plan, block plan showing the site and proposed development, existing and proposed floor plans, existing and proposed elevations, existing and proposed sections, design and access statement, planning fee (£578 per new dwelling as of April 2025), and supporting documents such as ecological surveys, tree surveys, heritage assessments, drainage strategies and transport statements where required. LCCL Construction's architectural team prepares all application documents.

What Factors Affect New Build Planning Approval?

The key factors that planning officers consider when determining a new build application include: design quality and compatibility with the character of the surrounding area, impact on neighbouring properties including overlooking, loss of light and overbearing effect, impact on trees and landscape, highways considerations including access and parking, drainage and flood risk, ecological impact, energy efficiency and sustainability, and compliance with local and national planning policies. LCCL Construction's design team has extensive experience designing new build houses that meet planning requirements first time.

New Build Planning in Green Belt, Conservation Areas and Special Designations

Significant parts of Hertfordshire and outer North London fall within the Green Belt where new build development is strongly restricted. New dwellings in the Green Belt are only permitted in very limited circumstances — typically replacement dwellings that are not materially larger than the existing property. Conservation areas and Areas of Outstanding Natural Beauty apply additional design requirements. LCCL Construction advises on the planning constraints of any site as part of our initial feasibility assessment.

Frequently Asked Questions About New Build Planning Permission

How much does planning permission cost for a new build house?

The planning application fee is £578 per new dwelling in England as of April 2025. Professional fees for preparing and submitting the application are additional and depend on the complexity of the project.

Can I build a new house on Green Belt land?

New build houses in the Green Belt are only permitted in very limited circumstances. LCCL Construction assesses Green Belt constraints as part of our initial feasibility review.

How long does planning permission last for a new build?

Planning permission for a new build house is typically valid for 3 years from the date of grant. Construction must commence within this period.

To discuss your new build project and planning feasibility call LCCL Construction on 020 8037 7332 or get an instant quote online.