Need more space without the cost, stress, and upheaval of moving home? A well-designed house extension is one of the most effective ways to add genuine living space and long-term value to your property, whether that means a larger kitchen, an additional bedroom, or a brighter, more open living area.
Core Rock Ltd designs and builds house extensions across all 10 boroughs of Greater Manchester, managing every stage of the project from initial design and planning through to groundwork, structural work, and final finishing. We do not subcontract. The same directly employed team that visits for your initial consultation is the team that completes the build.
Greater Manchester’s mix of Victorian terraces, 1930s semis, and post-war detached homes each present different opportunities and constraints for extending. Our team understands the structural considerations, party wall requirements, and planning expectations that come with each property type, helping you get the design right before a single brick is laid.
The most popular type of extension, typically used to extend a kitchen or create a larger open-plan living and dining space at the back of the property.
Adding space on both the ground and first floor, ideal for homeowners needing an additional bedroom or bathroom alongside extra living space downstairs.
Common on Victorian and Edwardian terraces, this extension fills in the side alley space to widen the kitchen or living area, often combined with a rear extension for maximum impact.
Combining a side return and rear extension into a single L-shaped build, creating substantial additional space and a more dramatic transformation of the ground floor.
Converting an existing garage into living space, or extending above or alongside it, making use of structure that's already in place to reduce build time and cost.
Take the first step today and reach out for a free consultation. Let’s bring your vision to life together, with care, clarity, and confidence.
Costs depend on the size and type of extension. A single-storey rear extension typically ranges from £25,000 to £45,000, a side return extension from £20,000 to £35,000, and a double-storey extension from £50,000 upwards. We provide a detailed, itemised quote following a free consultation.
Many single-storey rear extensions fall under Permitted Development Rights and don’t require full planning permission, provided they meet size and height limits. Double-storey extensions and properties in conservation areas typically need a full planning application. We advise on this as part of every free consultation.
Most single-storey extensions take between eight and twelve weeks from groundwork to completion, while double-storey extensions can take twelve to sixteen weeks depending on complexity. We provide a clear timeframe as part of your written quote.
In most cases, no. Extensions are typically built onto the outside of the property, meaning you can usually continue living in your home throughout the project, although there will be some disruption, particularly during groundwork and when connecting the new space to the existing house.
Yes. All house extensions require building regulations approval, regardless of whether planning permission is needed. We manage this process as part of our service and ensure the completed work is signed off correctly.
Yes. We take care to match brickwork, rooflines, and external finishes to your existing property wherever possible, so the extension looks like a natural part of the house rather than an obvious addition.
Yes. We offer a completely free, no-obligation consultation and written quote for all extension projects across Greater Manchester. Fill in the form above or call 07777 522999 to arrange a convenient time.
