Medium Side Infill Flat Roof
Medium Side Infill Flat Roof House Extension: A Comprehensive Guide for London Homeowners
Introduction
If you live in London and are feeling the squeeze for more space, a medium side infill flat roof house extension might just be the solution you need. With property prices at a premium and moving costs skyrocketing, extending your home is often the smarter, more economical choice. Whether you’re looking to expand your kitchen, add a dining area, or create a sunlit family room, a side infill extension can unlock the potential of your property.
This guide will walk you through the ins and outs of medium side infill flat roof house extensions. We’ll cover the benefits, costs, popular areas in London, and the types of homes that are best suited for this extension style. I’ll also sprinkle in some personal insights from my years working in home renovation across the city.
What is a Medium Side Infill Flat Roof Extension?
A side infill extension is essentially about filling in the unused space to the side of a property, typically between the main house and the boundary wall of the neighboring property. In London, where many homes have long, narrow side returns (particularly Victorian and Edwardian terraces), this can be a game-changer.
By adding a flat roof over this side space, homeowners can extend their internal living area, making use of what was once a wasted strip of outdoor land. The beauty of a flat roof design is that it keeps things simple, affordable, and practical, while still allowing plenty of options for skylights and other creative touches.
Why Choose a Flat Roof for Your Side Infill Extension?
Simplicity and Cost-Effectiveness
A flat roof keeps construction costs down. Compared to pitched roofs, the materials and labor required are significantly less. This means you can allocate more of your budget to high-end finishes or bespoke design features.
Maximizing Natural Light
Flat roofs are perfect for incorporating skylights or roof lanterns. These features flood the new extension with natural light, preventing the space from feeling dark or enclosed. In my experience, clients are often surprised by how airy and bright their infill extensions feel once complete.
Modern Aesthetic
Flat roofs give off a sleek, contemporary vibe. For those looking to modernize their home, this can be a subtle yet effective way to blend traditional architecture with modern design elements.
Where Are Medium Side Infill Extensions Popular in London?
You’ll find these extensions cropping up in neighborhoods across London, but they’re particularly popular in:
East London
Areas like Hackney, Dalston, and Bethnal Green are brimming with Victorian terraces that are prime candidates for side infill extensions. Homeowners here appreciate the added living space without compromising the charming façade of their homes.
North London
In Islington, Camden, and Crouch End, where houses often have side returns and high property values, extending sideways maximizes space without needing to sacrifice garden area.
South London
Dulwich, Clapham, and Balham are full of period homes where side infill extensions blend seamlessly into the streetscape, giving families the room they need without relocating.
West London
Areas like Chiswick and Shepherd’s Bush see a lot of side infill projects because of their spacious Victorian homes. These properties lend themselves to this type of extension, often leading to stunning kitchen/dining transformations.
House Types Best Suited for Side Infill Extensions
If you own one of the following types of properties, a side infill extension could be right up your alley:
Victorian and Edwardian Terraces
These homes are the most common candidates. Their characteristic side returns are practically begging for an extension.
Semi-Detached Houses
Semi-detached homes often have space to the side that can be utilized for a larger kitchen or additional living room.
Period Properties
Whether it’s a Georgian townhouse or a 1930s semi, period homes can benefit from this extension style, provided the design remains sympathetic to the existing structure.
Key Design Considerations
Skylights and Roof Lanterns
One of the best ways to avoid a dark, narrow extension is to install skylights or roof lanterns. I’ve found that even a couple of strategically placed skylights can transform the entire atmosphere of the room.
Open-Plan Layouts
A side infill extension naturally lends itself to open-plan living. Knocking through walls to combine kitchen, dining, and living spaces creates a more functional, social area.
Blending Old with New
While the flat roof and modern glass elements might feel contemporary, it’s essential to respect the existing architecture. Use complementary materials or colors to ensure the extension feels like a natural addition rather than an afterthought.
Planning Permission and Regulations
Permitted Development Rights
Many side infill extensions fall under permitted development rights, meaning you might not need full planning permission. However, certain restrictions apply, particularly in conservation areas or with listed buildings.
Building Regulations
Even if planning permission isn’t required, building regulations must always be followed. This ensures the extension is safe, energy-efficient, and structurally sound.
Party Wall Agreements
If your project involves working close to a neighbor’s property, a party wall agreement is usually necessary. This can seem daunting but is a standard part of the process.
How Much Does a Medium Side Infill Flat Roof Extension Cost?
Here’s a breakdown of typical costs for a medium side infill extension in London:
- Basic Build: £2,200 – £3,300 per square meter
- High-End Finish: Up to £4,500 per square meter
- Architect and Consultant Fees: 15-20% of construction costs
- Planning Application: Around £200
- VAT: 20% on most projects
For a 20-square-meter side infill extension, expect to pay between £44,000 and £90,000, depending on the complexity of the design and materials used.
Real-Life Case Study
Last year, I worked on a side infill extension in Hackney for a young family who needed more kitchen and dining space. By adding skylights and bi-fold doors leading to the garden, we created a bright, spacious area perfect for entertaining. They were thrilled with the result, and the project came in just under £75,000.
FAQ (Frequently asked questions)
How long does a side infill extension take to build?
Typically, a medium-side infill extension takes around 3 to 5 months from breaking ground to completion, depending on the complexity and weather conditions.
Will I need to move out during the build?
Not necessarily. Many homeowners stay put during the construction, though some choose to temporarily relocate if the work is extensive.
Can I extend my extension further in the future?
Yes, but this would likely require additional planning permission and structural assessments.
How much value does a side infill extension add to my property?
On average, a well-designed side infill extension can add between 10-20% to the value of your property.
Final thoughts
A medium side infill flat roof extension is a fantastic way to add space, light, and value to your London home. Whether you’re living in a Victorian terrace in East London or a period home in South London, this type of extension can transform your living space without the hassle of moving. If you’re considering a project, my best advice is to consult with an experienced architect and builder to ensure everything runs smoothly from start to finish.
