Mansard Extension Investment Case Study 📈
This case study highlights how a well-executed mansard extension can significantly increase both rental income and capital value. By adding an additional floor and reconfiguring the layout, a one-bedroom apartment was successfully converted into a three-bedroom split-level luxury home.
The additional floor area and improved layout repositioned the apartment within the rental market, attracting higher-quality tenants and increasing long-term demand. The extension also delivered a strong uplift in overall valuation.
Rental Growth & Capital Appreciation 🏠
This project demonstrates the commercial impact of vertical extensions in urban residential markets, particularly where space creation and layout optimisation are combined with quality-led refurbishment.
Project Performance Summary 💷
Development Cost: £90,000 |
Previous Rent: £1,350 pcm |
New Rent: £2,550 pcm
Rental Uplift: £1,200 pcm (16% ROI)
Previous Valuation: £475,000 |
Current Valuation: £650,000










