London House Extensions
Bespoke House Extensions in London
At Alpha Migss, we specialise in creating bespoke house extensions across London, transforming properties to meet the evolving needs of homeowners. Our experienced team delivers tailored solutions, ensuring each project enhances both the functionality and aesthetic appeal of your home. With extensive expertise in residential extensions and property expansion, we help London homeowners maximise their living space without the disruption and expense of relocating. Our architectural designers and skilled craftsmen work collaboratively to create seamless additions that respect the original character of your property while introducing contemporary elements that elevate your living experience. From initial concept to final execution, we maintain unwavering standards of quality and attention to detail.
Why Choose Us?
Pushing the limits of design
Customised Designs – We create extension plans specifically tailored to your lifestyle and preferences. Our architectural team considers your unique requirements, property characteristics, and neighbourhood context to develop solutions that maximise value and functionality while reflecting your personal aesthetic.
Premium Quality Materials – We source exceptional materials that ensure both durability and visual appeal. From structural elements to finishing touches, we select components that will stand the test of time while complementing your existing property and meeting the highest standards of quality.
Experienced Construction Team – Our skilled professionals bring decades of combined experience in London residential extensions. Each team member is fully qualified in their respective trade, adhering to the highest industry standards and committed to delivering exceptional craftsmanship on every project.
Comprehensive Project Management – From initial planning applications to final building control sign-off, our dedicated project managers oversee every aspect of your extension. We coordinate all contractors, manage deliveries, monitor timelines, and maintain transparent communication throughout the process.
Sustainable Practices – We embrace environmentally responsible construction methods, incorporating eco-friendly materials, energy-efficient systems, and sustainable design principles. Our approach minimises waste, reduces energy consumption, and creates healthier living environments while meeting modern building regulations.
What we do
Homes Designed Around you
Kitchens
Bathrooms
Living
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Extension SERVICES
Our House Extension Services
Rear Extensions
Our rear extension designs expand your living space seamlessly into gardens and outdoor areas. These popular additions typically create expanded kitchen-dining areas, family rooms, or multifunctional spaces that enhance modern living. We specialise in designing extensions that maximise natural light through strategic window placement, skylights, and glazed doors, creating bright, welcoming spaces with strong connections to garden areas. Our designs consider both aesthetic harmony with the existing structure and practical elements such as drainage, heating, and garden access.
Side Return Extensions
We transform underutilised side alleys into valuable interior space, significantly expanding ground floor rooms without reducing garden size. Particularly beneficial for London’s Victorian and Edwardian terraced houses, side return extensions typically create wider, more practical kitchen and dining spaces. Our designs often incorporate roof glazing to maintain light levels to adjoining rooms while creating dramatic architectural features. These extensions require careful planning and execution, especially regarding boundary walls and neighbouring properties—areas where our expertise ensures smooth project delivery.
Wrap-Around Extensions
For maximum space enhancement, our wrap-around extensions combine rear and side extensions to create L-shaped additions that dramatically transform ground floor living areas. These comprehensive extensions provide opportunity for complete spatial reconfiguration, often creating expansive open-plan living spaces that revolutionise family interaction and entertaining possibilities. Our designs carefully balance open areas with practical zones, ensuring the new space functions effectively while maintaining connection with the existing house. Thoughtful ceiling heights, structural solutions and glazing strategies ensure these larger extensions feel generous and light-filled.
Double-Storey Extensions
Our double-storey extensions provide substantial additional space, adding multiple rooms to your property. These significant additions typically accommodate additional bedrooms, bathrooms, or home offices above extended ground floor living areas. We meticulously plan these extensions to complement the existing building mass and roof lines, ensuring harmonious visual integration while maximising internal space. Our comprehensive approach addresses complex structural requirements, staircase configurations, and building regulation compliance, delivering extensions that significantly enhance your property’s functionality and value.
Kitchen Extensions
We create beautifully designed kitchen extensions that transform the heart of your home into spacious, functional, and stylish environments. Understanding that kitchen spaces must balance practical requirements with aesthetic aspirations, we develop designs that optimise workflow, storage, and social interaction. Our kitchen extensions incorporate thoughtful lighting schemes, appropriate ventilation, and quality fixtures while creating visual connections to garden spaces. We coordinate seamlessly with kitchen suppliers or can recommend trusted partners to ensure integrated delivery of your complete kitchen extension project.
FAQ
Frequently Asked Questions
Do I need planning permission for a house extension in London?
Many house extensions in London can be built under Permitted Development Rights, which allow certain types of development without requiring planning permission. However, these rights are restricted for properties in conservation areas, listed buildings, or those that have already been extended. Our team conducts a thorough assessment of your property’s planning status during initial consultations and manages all aspects of the planning process, whether submitting a full planning application or securing a Certificate of Lawful Development. We have extensive experience navigating London’s various borough planning departments and can advise on feasible options for your specific circumstances.
How much does a house extension cost in London?
House extension costs in London typically range from £2,000-£3,000 per square metre for standard quality finishes, with higher specification projects ranging from £3,000-£4,000+ per square metre. A typical single-storey rear extension might cost £50,000-£80,000, while double-storey extensions usually start from £90,000. Factors influencing cost include groundwork complications, structural requirements, glazing specifications, interior finishes, and kitchen/bathroom installations. During initial consultations, we provide transparent cost estimates based on your specific requirements and can suggest design approaches to work within different budget parameters while maintaining quality.
How long does the extension process take?
The timeline for a house extension project typically spans 4-8 months from initial consultation to completion. Design development and planning approval usually takes 2-3 months, depending on the complexity of the proposal and local authority processing times. Construction periods vary according to project scope: single-storey extensions typically require 3-4 months on site, while double-storey or complex extensions might take 4-6 months. We provide detailed programme schedules during the planning phase and keep you informed of progress throughout the project.
Can you match the extension to my home's existing style?
Yes, we excel at designing extensions that integrate harmoniously with existing properties. For period homes, we can incorporate matching brickwork, traditional detailing, and proportional elements that respect the original architecture. Alternatively, many clients prefer a contemporary contrast that clearly distinguishes new from old—using modern materials like glass, zinc, or render to create a striking juxtaposition. During the design process, we present various approaches and material options, helping you decide whether a seamless match or complementary contrast best suits your property and preferences.
What disruptions should I expect during construction?
House extension projects inevitably cause some disruption, but we implement strategies to minimise impact on your daily life. Dust and noise are the most noticeable factors, particularly during demolition and structural work in the early stages. Depending on the extension’s location and scope, you may lose access to certain rooms or facilities temporarily. Many clients continue living in their property during construction, with appropriate dust screening and security measures in place. For others, particularly during kitchen extensions, temporary relocation might be preferable during certain phases. Our project managers discuss these aspects in detail before construction begins, helping you plan accordingly and establishing considerate working hours and practices.
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THE PROCESS
Our Process – How We Work
Step 1: Initial Consultation & Site Survey
We begin with a thorough consultation at your property to understand your requirements, aspirations, and budget considerations. Our architectural team conducts a comprehensive site survey, assessing existing structures, measuring accurately, and evaluating technical considerations such as structural implications, services locations, and level changes. This detailed assessment forms the foundation for feasible design proposals that address both your vision and practical constraints.
Step 2: Design & Planning
Based on our consultation and survey, our architectural team develops detailed designs for your extension. We present concept drawings and 3D visualisations that help you envision the completed project, refining the designs based on your feedback. Our planning specialists manage the entire planning process, preparing and submitting applications for planning permission or certificates of lawful development as required. We handle all necessary documentation, liaison with local authorities, and building regulations compliance to ensure a smooth approval process.
Step 3: Construction & Project Management
Once approvals are secured, our construction team executes your extension with precision and care. Beginning with site preparation and foundation work, we progress methodically through the build, with structural elements, roofing, windows and doors, and internal finishes installed in carefully planned sequence. Throughout construction, our project manager provides regular updates, conducts quality checks, and addresses any questions or concerns, ensuring transparent communication and minimal disruption to your household.
Step 4: Completion & Handover
As construction nears completion, we conduct thorough snagging inspections to identify and address any outstanding items. We obtain final building control approval and ensure all work meets our exacting standards. The formal handover includes a comprehensive walkthrough of your new extension, with guidance on operation and maintenance of all systems and features. Our aftercare service provides ongoing support, ensuring complete satisfaction with your house extension long after project completion.