The London Boroughs of Harrow and Hillingdon cover the West London corridor from Harrow-on-the-Hill (HA1) through North Harrow (HA2), Ruislip (HA4), Northwood (HA6), Uxbridge (UB8), Hayes (UB3), and Southall (UB1/UB2). The housing stock across both boroughs is dominated by interwar and Edwardian semis and detacheds on relatively generous plots.
Extension Potential in Harrow and Hillingdon
The larger plots typical of Harrow and Hillingdon represent some of the best extension value in Greater London — the combination of affordable entry pricing and significant extension potential is not achievable closer to central London.
Key extension opportunities:
- Ground floor rear extensions at 4–6m on interwar semis (HA1, HA2, HA4, UB8)
- Side extensions viable on detached properties with adequate plot width
- Prior approval route extends PD to 6m on semis, 8m on detacheds — relevant for many properties in both boroughs
- Double-storey rear extensions achievable on larger plots with adequate setback from rear boundary
Loft Conversions in Harrow and Hillingdon
The interwar semi-detached stock across both boroughs is a strong candidate for hip-to-gable conversions. Harrow's hilly terrain means some properties have unusual roof configurations — a site-specific assessment is more important here than in flat inner London areas.
Harrow-on-the-Hill conservation area (the old village around St Mary's church on the hill) has strict controls on external alterations including roof works.
Planning in Harrow and Hillingdon
Both boroughs have relatively pragmatic planning approaches to householder applications in residential areas. Conservation areas are limited to specific town centres and old village nuclei.
rcbGroup
rcbGroup delivers extensions, loft conversions, and refurbishments across Harrow and Hillingdon — HA1–HA6 and UB1–UB10.