House Construction
Room extension for your home — more space without moving
Extend a bedroom, add a room on the ground floor or build out over open space, with proper foundations and a seamless finish.
A growing family, a parent moving in, or a home office can all mean you need one more room. Extending on your plot is often simpler than moving.
The difficulty is the join. New foundations settle differently from old ones, so a careless extension cracks along the junction within a year. RennovEN designs the connection so old and new behave as one.
Signs you need this
- You need one or two extra rooms
- You have open space at the side, back or front
- You want the extension to match the existing house
- Previous extensions in your area cracked at the joint
The RennovEN promise
- 10-year warranty on all works
- Itemised pricing, approved before work begins
- One accountable team across every trade
- Residential specialists — homes only
Diagnosis
Why it happens
Differential settlement
New footings next to old ones settle at a different rate. Without a designed joint, a crack forms at the junction.
Poor bonding
New brickwork placed against old walls without toothing or connectors separates over time.
Mismatched levels
Floor and roof levels that don’t align create leaks and trip hazards.
Our method
How RennovEN does it
- 1
Survey
Existing structure, levels and permissible extension area.
- 2
Design
Layout, foundation and junction detailing.
- 3
Build
Foundation, walls, roof and services connection.
- 4
Blend in
Matched finishes, waterproofed junctions and handover.
What’s included
- Foundation and structure for the new room
- Designed junction with the existing house
- Electrical and plumbing extension
- Roof waterproofing over the new room
- Matched plaster, paint and flooring
What affects the cost
- Size and number of rooms
- Ground conditions and foundation depth
- Roof type and waterproofing
- Services to be extended
- Finish matching required
Every home is different, so we don’t publish rate cards. After a free inspection you get an itemised estimate, and you approve every line before work begins.
Get my itemised estimate10-year warranty
The extension, including the junction with your existing house that we construct, is covered for 10 years against workmanship defects.
How our warranty worksFAQ
Room Extension: your questions
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