Planning a larger renovation project? Talk to Hampstead RenovationsOffice 020 8054 8756Mobile 07459 345456
Street Service PageOnslow Square • SW7

House Extensions on Onslow Square

House extension pages need to explain how feasibility, structure, planning route, drainage, glazing, and internal fit-out all shape the scheme, not just how much floor area is added.

Proof
2 signals
Planning
6 notes
FAQ depth
6 answers
Call office 020 8054 8756View street hub
Office & showroom: 020 8054 8756Mobile / quick response: 07459 345456
Evidence stackDecision factorsFAQsSpeak to the team
Local context

House Extensions on Onslow Square

This page covers house extensions work on Onslow Square and in the wider South Kensington area — with local property context, planning considerations, and examples of the type of work we deliver nearby.

Proof
2 signals
Planning
6 notes
FAQ depth
6 answers
About this page

Local detail we can share

What we can tell you about house extensions work in this specific location — the property types we see nearby, typical constraints, and project examples.

  • •Real location coverage
  • •Named local landmarks
  • •Transport context
  • •Audience-specific concerns
  • •Historical property detail
Planning and compliance
  • •Permitted-development limits, lawful-development certificates, or a full planning application should be confirmed before design is fixed.
  • •Conservation-area, Article 4, and listed-building controls can change the roofline, materials, and extent of visible change.
  • •Structural engineering, drainage design, build-over agreements, and party-wall coordination often drive the build route.
  • •Building control covers structure, fire, insulation, ventilation, and drainage and should be planned from the start.
  • •Grade II listed stucco terraces
  • •Basement works require full structural assessment
Property fit and cost
  • •Strong fit for Victorian and Edwardian family homes with side-return, rear, or wraparound potential.
  • •Best where the existing house works well but the ground-floor footprint, daylight, or garden connection is too tight.
  • •Useful where a new kitchen-dining-living space is the real goal behind the extra square metres.
  • •Works best when feasibility, structure, planning, and fit-out are scoped together rather than split across separate parties.
  • •Regency Villa homes are common around Onslow Square.
  • •Extension type and size: rear, side-return, wraparound, or a larger two-storey scheme.
  • •Structural openings, foundations, steelwork, and how the new structure meets the existing house.
  • •Glazing packages, rooflights, drainage diversions, party-wall matters, and site-access logistics.
  • •Kitchen, dining, and living-space fit-out level, including services, lighting, and finishes.
  • •Local client concern affecting scope: Stucco restoration.
Evidence Stack

Proof supporting House Extensions on Onslow Square

Exact local project on Onslow Square

Garden square townhouse renovation

Full renovation of a 5-storey stucco townhouse including new kitchen, 4 bathrooms, basement improvements, and facade restoration.

Exact local project on Onslow Square

Lower-ground kitchen and garden room

New kitchen at lower-ground level with stone surfaces, integrated appliances, and glazed doors to a rear garden redesign.

Decision factors
  • •Whether rear, side-return, or wraparound gives the best layout gain for the budget.
  • •How much of the project value sits in the shell versus the interior fit-out and glazing.
  • •Whether the household can remain in occupation once structural openings and kitchen works begin.
  • •Whether the extension should be coordinated with a wider refurbishment of the existing house.
  • •Typical brief in Onslow Square: international families requirements.
  • •Typical brief in Onslow Square: french lycée parents requirements.
Support links
Customer Reviews

Published Reviews Relevant to Onslow Square

Published customer feedback selected using Onslow Square, South Kensington, SW7, and house extensions overlap.

Featured review
"Converted small bathroom to wet room for elderly parent. Thoughtful, practical design."
Bathroom RenovationMuswell Hill2024-08-22
D
David L.
Verified customer feedback
Emma W.
Crouch End • 2024-09-18
"Complete bathroom renovation finished exactly as promised. Stunning result!"
Bathroom Renovation
Anna K.
Hampstead, NW3 • 2024-09-18
"Excellent loft conversion with full mansard. The design maximised every inch of space and the finish is impeccable. Conservation area planning was handled smoothly too."
Loft Conversion
Read more reviews from our satisfied clients across LondonView all testimonials

Questions About House Extensions on Onslow Square

Street-specific answers for house extensions in South Kensington SW7.

Some do and some do not. Many rear and side-return extensions can use permitted development, but larger schemes, properties in conservation areas, flats, listed buildings, and homes affected by Article 4 directions usually need a full planning application. We confirm the right route for your Onslow Square address before design is committed.
It depends on the plot, the existing layout, daylight, drainage, budget, and the kind of space you want. We assess these together at feasibility stage and recommend the option that gives the best layout gain rather than just the largest footprint.
Yes. We coordinate structural design for foundations, steelwork, and openings into the existing house, and we manage party-wall notices and awards with neighbours where the work affects a shared or boundary wall.
Often, yes - especially for rear and side-return extensions where the existing house remains usable while the shell is built. Once structural openings, kitchen works, or services connections begin, some disruption is unavoidable, so we plan that phase carefully with you.
Most Onslow Square extensions run from around ten to twenty-four weeks on site depending on size, structural complexity, glazing lead times, and finish level - separate from the design and planning period beforehand.
Yes. In Onslow Square, Thurloe and Alexander Conservation Area can affect roofline, materials, glazing, and the extent of visible change. We check those constraints before the extension scheme is fixed.

Need House Extensions on Onslow Square?

We can scope the job with the right street-specific planning, logistics, and property-fit context before pricing and programme are fixed.

Office & showroom: 020 8054 8756Mobile / quick response: 07459 345456
Call office 020 8054 8756Mobile 07459 345456Request a Quote
WhatsApp