Extensions, Lofts & Refurbishments — Done Properly

Rear Extensions

Open up your ground floor and add genuine living space. From single-storey kitchen extensions to large wrap-arounds — designed, planned and built by verified Dwellinger contractors.

Loft Conversions

Transform unused roof space into a bedroom, bathroom or home office. Dormer, hip-to-gable and mansard conversions across London.

Full Refurbishments

End-to-end renovation of your entire home. Your contractor strips back, replans, and rebuilds to a high spec — managing every trade from demolition to decoration.

Structural Alterations

Remove walls, open up floor plans, install steel beams. Structural engineering and build managed together under one roof.

Kitchen Extensions

The most popular project in London. We combine rear extension works with a bespoke kitchen fit-out for a seamless result.

Builder Score™

Every contractor we work with is scored on reviews, compliance, on-time delivery and responsiveness — so you only get the best.

AI-backed estimates

Our cost intelligence platform gives you a realistic ballpark before you commit to a single meeting — no more guessing.

A-to-Z delivery

Design, planning, structural, build, fit-out, snagging. One team. One contract. One point of accountability.

One accountable party

No blame-shifting between architect, builder and trades. Your verified principal contractor is solely accountable — the buck stops with them.

I just want to know how much it's actually going to cost

How do I know I can trust them?

Get a ballpark estimate

Use our cost intelligence tool to understand what your project might cost before committing to anything.

Book a site survey

We visit your property, assess the scope, and provide a detailed fixed quote.

We deliver

We manage the entire project to completion — one team, one contract, one point of contact.

SE22 East Dulwich

Dormer loft conversion creating master bedroom with en-suite. Completed on time and within budget.

BR3 Beckenham

Single-storey rear extension opening the ground floor into a kitchen-diner with bifold doors.

AL3 St Albans

Complete refurbishment of a 4-bed semi including loft, kitchen, bathrooms and full redecoration.

Do I need planning permission for a rear extension?

Most single-storey rear extensions within 3–6m fall under Permitted Development. We advise on your specific situation during the initial consultation.

How much does a rear extension cost in London?

Typical range is £45k–£150k+ depending on size, specification and location. Our AI cost intelligence tool gives you a realistic ballpark before any meetings.

How long does a loft conversion take?

8–14 weeks on average for a dormer conversion. More complex mansard or hip-to-gable projects may take 14–20 weeks.

What's included in your service?

Full A-to-Z delivery: design, planning, structural engineering, build, fit-out, snagging. Everything under one contract.

What is Builder Score™?

Our proprietary scoring system rating contractors on verified reviews, regulatory compliance, on-time delivery and client responsiveness. Every trade we use is scored.

How is Dwellinger different from Checkatrade?

Checkatrade lists individual tradespeople. A Dwellinger principal contractor manages the entire project and is solely accountable for the outcome — backed by a Builder Score™ that tracks their actual performance.