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House extensions are the most popular way London homeowners add space. You’re extending back, to the side, or upward. You’re solving space problems without moving. Understanding what house extensions cost, or learning which types work best, helps you plan realistically. House extensions transform how families live. They solve genuine space problems. They add property value. They enable staying in neighborhoods families love. Experienced in designing and building house extensions that enhance properties and deliver excellent results.
Types of House Extensions Popular in London
Single storey rear extensions are most common. They add kitchen or living space. They’re more affordable than double storey. They often qualify for Permitted Development. Families gain proper kitchen size or comfortable living areas. Connection to gardens improves.
Double storey extensions add multiple rooms. They add bedrooms and bathrooms. They transform properties significantly. They require Planning Permission. They’re more expensive but add substantial value.
Kitchen extensions specifically are extremely popular. London kitchens are often tiny. Extensions provide proper cooking and dining space. Families gain functionality and enjoyment.
Living room extensions add comfortable entertaining space. They create flow from existing living areas. They provide room for families to spread out. They enhance daily life.
Side extensions use garden space productively. Particularly popular on terraced properties with narrow side access. They create additional rooms without expanding backward.
Wrap-around extensions expand back and along side. They create L-shaped additions. They maximize space on properties with available side garden. Dramatic transformations occur.
Loft conversions add upstairs space without using garden area. Popular in London where outdoor space is precious. They create additional bedrooms or offices. They’re often simpler to get approved.
Basement extensions create underground space. More expensive and complex. But provide dramatic additional space on compact properties.
Good extension design respects existing building character. Materials should match. Proportions should work. Extensions should look intentional. Architects understand what works in London neighborhoods.
Planning Permission and Permitted Development Rules
Many house extensions in London qualify for Permitted Development. This avoids Planning Permission entirely.
Single storey rear extensions must be maximum four meters deep. Terraced properties have three meter limits. Extensions can’t exceed fifty percent of original garden area. Height must not exceed existing house eaves height.
If your extension meets these conditions, you don’t need Planning Permission. Building Regulations approval is still required. But Planning Permission isn’t necessary.
If your extension exceeds any limits, Planning Permission is needed. This takes eight to twelve weeks typically. You submit plans to the council. They review and approve or refuse.
Double storey extensions almost always need Planning Permission. Visual impact is too significant. Design must be carefully considered.
In London, Conservation Areas affect these rules. Many neighborhoods have Conservation Area designation. External appearance matters. Materials must match. Proportions must work. Design must respect area character.
Listed buildings almost always need Planning Permission and Listed Building Consent. Changes require approval. Consent is difficult to obtain but sometimes possible.
Getting professional assessment determines whether your extension qualifies for Permitted Development. This clarity prevents costly mistakes and unnecessary delays.
House Extension Costs in London: A Practical Guide
Costs vary by extension type and location but follow patterns.
Single storey extensions in London typically cost 1800 to 2500 per square meter. For a 30 square meter extension, construction might run 54000 to 75000. Add professional fees at 10 to 15 percent. Add contingency at 10 percent. Total project cost probably runs 70000 to 95000.
Double storey extensions cost significantly more. Typically 2800 to 4500 per square meter. For a 40 square meter extension, total project cost runs 130000 to 200000 including all fees.
In central London, costs are higher. Outer London costs are lower. Building condition affects costs. Ground conditions affect costs. Design complexity affects costs.
What affects cost? Ground conditions matter. Good ground costs less. Poor ground requiring special foundations costs more.
Building condition affects cost. Properties in good condition cost less. Buildings with complications cost more.
Design complexity affects pricing. Simple rectangular extensions cost less. Complex shapes cost more.
Material choices matter. Budget materials cost less. Premium materials cost more.
Finish quality affects cost. Budget finishes cost less. Mid-range finishes are typical. Premium finishes add 20 to 30 percent.
Design Strategies to Add Space and Value
Good design maximizes light. Large windows bring daylight in. Rooflights bring additional light. Positioning matters. Reflective surfaces help light travel.
Flow between spaces is crucial. Bifold doors create seamless transitions. Kitchens connect naturally to dining. Living areas connect intuitively. Circulation works efficiently.
Space is maximized efficiently. Islands provide prep surfaces. Storage keeps clutter managed. Work surfaces are adequate. Seating is comfortable.
Connection to gardens is intentional. Views are framed. Outdoor space becomes extension of indoor space. Year-round enjoyment happens.
Materials complement existing building. Modern finishes work with period exteriors. Brick matches existing. Roof integrates naturally. Extension feels intentional.
Ventilation prevents stuffiness. Extraction hoods work efficiently. Windows provide fresh air. Proper ventilation is essential.
Why Homeowners Choose Extension Architecture for House Extensions
Extension Architecture specializes in London house extensions. They understand London neighborhoods thoroughly. They know Planning Committees. They navigate conservation rules expertly.
They assess which extension type suits your property. They recommend the best approach. They explain pros and cons. They help you decide.
They provide transparent design process. You understand decisions. You’re involved throughout. There are no surprises.
They deliver quality outcomes. Extensions look right on properties. They function beautifully. They add value. They get approved efficiently.
They manage projects professionally. Regular site visits ensure quality. Communication is clear. Problems are solved collaboratively. You know what’s happening.
They deliver what they promise. On budget. On time. Quality completed.
For your London house extension, Extension Architecture provides the expertise you need. They understand your neighborhood. They design solutions that work. They manage the entire process professionally from concept through completion.