New Build Residential Development in London: Planning, Process, and Costs 2025

A new build residential project in London requires full planning permission — not a householder application, but a full application for development on the land. The planning assessment is more complex than for a householder extension because the LPA must assess: new residential units against the Development Plan (London Plan GLA policies, Borough Local Plan housing policies, and any relevant Neighbourhood Plan); design quality (the proposed scheme must comply with the LPA's design guidance, the London Plan's design policies, and the National Design Guide); the impact on neighbours and the character of the area; transport, parking, and cycle storage; drainage and flood risk; ecology and biodiversity; heritage impact (if the site is adjacent to a listed building or within a conservation area). Key planning policy context for new residential in London: the National Planning Policy Framework (NPPF, 2023) sets out the presumption in favour of sustainable development — new housing in a sustainable location with no unacceptable impacts should be approved; the London Plan (2021) sets out the GLA's strategic housing and design policies, including: minimum unit sizes (GIA by bedroom count: studio ≥ 37 sq m, 1-bed ≥ 50 sq m, 2-bed ≥ 61 sq m, 3-bed ≥ 86 sq m); accessibility standards (Building Regulations Category 2 or 3 for new residential units in London); outdoor amenity space (private amenity space or access to communal amenity space); cycle storage; refuse storage; the Borough Local Plan: each London borough's Local Plan sets out specific housing policies for the borough, including housing allocation sites, infill and backland development policies, affordable housing requirements (for schemes above a threshold, typically 10+ units, affordable housing contributions are required), and density guidance. Typical planning timeline for a small new build residential scheme in London (1-4 units): pre-application advice: 4-8 weeks from request to meeting; design development: 6-12 weeks; full planning application preparation and submission: 2-4 weeks; statutory determination period: 8 weeks for small schemes, but 13 weeks for "major development" (10+ units); in practice, many London Boroughs take 16-24+ weeks to determine a full planning application for a new residential scheme.

All new residential buildings in England must comply with the full suite of Building Regulations — all applicable Parts, including: Part A (Structure): all structural elements designed by a structural engineer to current standards (Eurocodes); Part B (Fire Safety): fire detection, alarm, means of escape, fire separation between units, and sprinklers (for buildings above 11m or 7 storeys); Part C (Site Preparation and Resistance to Contaminants): site investigation, radon protection, contamination remediation; Part D (Toxic Substances): not typically a major issue for standard residential; Part E (Resistance to Sound): enhanced acoustic performance between units — wall and floor between dwellings must achieve Dw ≥ 45 dB airborne sound insulation and L'nT,w ≤ 45 dB impact sound insulation; Part F (Ventilation): dwelling ventilation to BS 5250 — typically whole-house MVHR (Mechanical Ventilation with Heat Recovery) for an airtight new build in London; Part G (Sanitation, Hot Water Safety, and Water Efficiency): water efficiency target 110 litres per person per day for new residential in London (stricter than the 125 litres national target — the London Plan sets a tighter water efficiency target); Part H (Drainage and Waste Disposal): drainage design to BS EN 12056; Part J (Combustion Appliances and Fuel Storage): gas boiler installation, flue installation; Part K (Protection from Falling, Collision, and Impact): staircase, balcony, and window requirements; Part L (Conservation of Fuel and Power): 2021 edition, thermal performance of new dwellings — U-values, airtightness (target 5 m³/h·m² at 50 Pa), FEES (Fabric Energy Efficiency Standard), and TER/DER (Target and Dwelling Carbon Dioxide Emission Rate) calculated using SAP (Standard Assessment Procedure) for each dwelling; Part M (Access to and Use of Buildings): Category 2 wheelchair adaptable standard required for all new build residential in London under the London Plan; Part O (Overheating Mitigation): new requirement (2022) — new dwellings must demonstrate adequate mitigation of overheating risk using CIBSE TM59 or simplified assessment; Part Q (Security): doors and windows to PAS 24 security standard; Part S (Infrastructure for Charging Electric Vehicles): EV charging point infrastructure for each dwelling with associated parking; Part T (Toilet Provision in Non-Domestic Buildings): not applicable to residential. The current Building Regulations (the Future Homes Standard transitional arrangement): new homes in England built under building regulations notices submitted from June 2023 apply the 2021 Part L and Part F regulations, which are a stepping stone to the Future Homes Standard (expected full implementation in 2025-2026) requiring homes to produce 75-80% less carbon than homes built to 2013 regulations.

VAT on new residential construction: the construction of a new dwelling in England is zero-rated for VAT purposes (under Group 5, Schedule 8 of the VAT Act 1994). This means: the contractor builds the new dwelling and charges zero VAT on the contract (0% VAT on labour and most materials incorporated in the building); the client pays 0% VAT on the construction contract; and the materials purchased by the contractor for incorporation in the building are also zero-rated. However: professional fees (architect, structural engineer, planning consultant) charged to the client are standard-rated (20% VAT); building materials purchased directly by the client (where the client is not VAT-registered) are typically standard-rated — the zero-rating applies to the supply of construction services and materials by a VAT-registered contractor, not to the client's own material purchases. Self-build VAT reclaim: where a self-builder (an individual building their own home for personal occupation) directly purchases building materials that should be zero-rated but has been charged VAT, they can reclaim the VAT paid using the Self-Build VAT Reclaim Scheme (HMRC VAT431NB form). The scheme allows a one-off reclaim of VAT paid on building materials incorporated in the new dwelling, submitted within 3 months of the date of the Completion Certificate. Typical VAT reclaim on a London self-build: £5,000-£25,000 depending on the material content of the self-build contract. Developer considerations: for a developer building a small residential scheme (2-5 units), the commercial and tax considerations are different from a self-builder. The development is likely to be treated as a trading activity (not a capital gain), and the developer should take specialist tax advice before starting the project. The zero-rating for new residential construction applies regardless of whether the units are for sale, for rent, or for the developer's own use.

The cost of a new build residential project in London in 2025 is significantly higher than for a domestic extension — the full compliance burden of a new building (all Parts of Building Regulations, London Plan standards, section 278 highway agreements, CIL, and utility connection costs) adds substantial cost above the basic construction. Typical construction costs for a new build residential project in London: new build house (single dwelling, 100-150 sq m GIA, traditional masonry construction, mid-range specification): £2,500-£4,000/sq m GIA (construction only, excluding site, land, professional fees, and planning). For a 120 sq m new build house in inner London at £3,200/sq m: approximately £384,000 construction cost. New build apartments (residential apartments in a multi-storey scheme, 50-80 sq m per unit): £3,000-£5,000+/sq m GIA (construction cost per sq m tends to be higher for apartments than for houses because of shared circulation, fire safety requirements, and structural complexity). Total development costs (construction + land + professional fees + planning + CIL + utilities): In London, the total development cost of a new build residential scheme typically includes: land cost (dominant in inner London — a single building plot in inner London can cost £500,000-£2,000,000+); construction cost (as above); professional fees (architect + structural + M&E + planning consultant + QS: 12-18% of construction cost); planning costs (application fees, pre-application advice, EIA if required, CIL — Community Infrastructure Levy, which in some London boroughs is £200-£500/sq m of new residential GIA or more); utility connections (new gas, electricity, water, and drainage connections for a new build: £10,000-£50,000+ depending on distance from mains services); building warranties (NHBC Buildmark, Premier Guarantee, or similar: typically 1.0-1.5% of construction cost); and VAT (0% on construction, 20% on professional fees). Contractor procurement for a new build in London: the main contractor for a London residential new build project should be procured differently from a domestic extension contractor. They should demonstrate: experience in NHBC or equivalent warranty-compliant construction; ability to meet the London Plan's Part L 2021 SAP and airtightness requirements; knowledge of Section 278 highway obligations and utility connections; and the financial capacity to carry the project over a 12-24 month construction programme.