Builders in Richmond | Renovations, Extensions & Conversions TW9

Rear extensions — the most common approach, particularly on the Victorian terraces off Sheen Road and Queens Road, extending the kitchen or living space into the rear garden with glazed doors opening onto the garden.

Side return extensions — infilling the narrow alley alongside Victorian terrace kitchens, typically to widen a kitchen-diner. Common on the tighter plots closer to Richmond town centre.

Wraparound extensions — combining rear and side return into a single ground-floor scheme, suited to corner plots or wider-fronted properties near Petersham and along the Richmond Hill slopes.

Double-storey extensions — adding space at both ground and first floor. These attract closer scrutiny from the council given the roofline impact, especially on properties visible from Richmond Park or the river.

Several factors shape the final cost of a house extension in Richmond:

• Size, layout, and structural complexity
• Extension type — rear, side return, wraparound, or double-storey
• Materials and finishes — brick matching, glazing specification, roofing
• Planning permission requirements (full application is standard across Richmond's conservation areas)
• Listed building consent, where applicable
• Flood risk assessment, where the property falls within a Thames flood zone
• Site access — several Richmond streets have restricted parking and narrow approaches

Rear extensions in Richmond typically run £90,000 to £225,000; side return conversions from £55,000 to £110,000; wraparound extensions £140,000 to £310,000; double-storey extensions £195,000 to £400,000.

Richmond's Victorian and Edwardian rooflines often hold more usable space than homeowners expect. Because the borough's conservation area coverage is extensive, roofline changes almost always require full planning permission, and on listed properties — of which Richmond has over 800 — Listed Building Consent as well. The council assesses roof alterations carefully where the property sits on or near Richmond Hill or the river, given the sensitivity of views across Richmond Park and along the Thames.

Mansard conversion — well-suited to the grander properties around Richmond Green and The Vineyard, particularly where a rear mansard avoids disrupting the street-facing roofline.

Dormer conversion — the standard choice for Victorian terraces further from the most sensitive viewpoints, adding headroom and usable floor area.

L-shaped dormer — combining a rear dormer with a side element over the back addition, typically the option that adds the most usable space within the existing footprint.

Roof light (Velux) conversion — the least disruptive approach, suited where the existing pitch already provides adequate headroom.

Costs reflect the planning and design work required for conservation area applications, the specification expected across TW9 and TW10, and the access constraints common on Richmond's narrower residential streets.

The London Borough of Richmond upon Thames has 85 conservation areas — the highest count of any London borough — and approximately 805 listed buildings across all three grades. Richmond Hill, Richmond Green, Richmond Riverside, Petersham, Central Richmond, and the streets bordering Richmond Park all sit within named conservation designations.

• Full planning permission is required for external alterations, extensions, roofline changes, and basement work throughout the borough
• Listed Building Consent is required in addition where the property is listed — often covering internal alterations as well as external changes
• A borough-wide Article 4 direction removes permitted development rights for basement and subterranean work
• Flood zone restrictions apply to properties near the Thames, affecting basement design and drainage
• Pre-application advice costs £190 for householder applications on non-listed dwellings, and £660 where the property is listed (which includes a conservation officer site visit)

We handle planning liaison as standard, working with the project architect where one is appointed — establishing what is realistic before a design is drawn, not after a refusal.

We regularly serve as main contractor within architect-led residential projects across Richmond. For architects, that means a construction partner that interprets detailed drawings accurately, coordinates specialist trades, and raises buildability questions early rather than on site. For property investors, the priority is programme discipline, cost control, and protecting the value of the finished property — particularly on the Georgian and Victorian houses around Richmond Green and The Vineyard, where quality of finish directly affects resale.

Larger projects are run under JCT contracts, providing a recognised framework for scope, payment, variations, and programme management.

Dominant Construction LTD 185 Fulham Palace Road, Fulham, London W6 8QX 020 7118 6155 | info@dominantconstruction.co.uk FMB Registered | 15+ years' experience | JCT Contract Experience