Premier House Extensions in Richmond, Ealing & Hammersmith

Transforming West London Homes with Expert Structural Craftsmanship and Modern Design.

Specialised Extension Services

To get the best results in West London, your extension needs to respect the local architecture. We specialize in:

  • Victorian Side Return Extensions: The gold standard for Richmond and Hammersmith terraces, maximizing unused alleyway space for a bright, open-plan kitchen.
  • Wraparound Kitchen Extensions: Perfect for Ealing homes, these extensions wrap around the rear and side of your property, creating a spacious kitchen-diner with seamless indoor-outdoor flow.
  • Double-Storey Extensions: Ideal for families needing extra bedrooms or living space, our double-storey extensions add significant square footage while maintaining your home's character.
  • Modern Glass Extensions: Seamlessly blending heritage brickwork with contemporary floor-to-ceiling glazing.
Loft conversion in London

2026 Extension Cost Guide

Extension Type Estimated Cost (Per sqm) Typical Duration
Basic Rear Extension £3,200 – £3,800 12–16 Weeks
Side Return (Victorian) £3,500 – £4,200 14–18 Weeks
Wraparound / Glass-Heavy £4,000 – £5,000+ 18–24 Weeks

Costs in 2026 reflect current material prices and the high-spec finishes required in conservation areas like Kew and Richmond.

Navigating Planning in West London

We handle the complexities of Permitted Development and Full Planning Permission across all local councils:

  • Richmond upon Thames: Expertise in Conservation Area requirements and Article 4 Directions.
  • Ealing & Hammersmith: Navigating building control for structural alterations and party wall agreements.
Staircase to new Loft Conversion

WHY CHOOSE INVENTIVE DESIGNS?

Versitile & Professional

We have a hand-picked friendly team of painters, decorators, carpenters, electricians, plumbers, tilers and brick layers.

12 Year Experience

With over 12 years of experience as building contractor we take great pride in ensuring our work meets your requirement.

No Obligation Consultation

Call, email or use our contact us form to arrange a free initial appointment and free building works quotation with no obligations.

Honest & Reliable

Enjoying a growning portfolio of returning clients, we pride ourselves on our consistant honest and friendly customer service.

Friendly, Helpful & Conscientious

We get excited with every building project large or small and very happy to be a part of your journey to make a dream home or business premises.

Double storey rear extension Ealing semi-detached house.

Our Process

  • Initial Consultation:
    We visit your property in Richmond, Ealing, or Kew to assess feasibility.
  • Structural Design:
    Coordinating with architects for "L-shaped dormers" or "structural alterations."
  • Build & Project Management:
    From foundations and brick restoration to plumbing and electrics.
  • Premium Finishes:
    Professional carpentry, wood flooring installation, and interior decoration.

Complete House Extension Building Solution

Many extension builders just build like a production line assuming all house extension builds are the same. At Inventive Designs we have over 10 years’ experience specialising in building house extensions in London and have accumulated a wealth of experience, skills and a professionally trained team who understand every new house extension comes with its own set of challenges which we are comfortable resolving. We understand the materials, the technologies, the planning authorities and the property markets. We help you through the whole journey to realise your perfect house extension in London from planning, consultation, budget and time frame with the least disruption to your home like during the process.

What does a house extension in London cost?

The cost of a new house extension in London varies on a few factors. The main considerations are reliant on the planning authority, your property, your tastes and the scale of the project you would like. We have found as a guide side return house extensions are generally cheaper than a single storey house extension. Also, both of these are less expensive than the larger wraparound and double-storey house extensions. We always look for the best value in both the materials and hours we work to maintain the managed budget of the project making sure there are no hidden costs or surprises. We have found this approach results in the best house extension for the client leaving them much more satisfied and willing to recommend our services.

I WANT A HOUSE EXTENSION IN LONDON