Side Return Extension Specialists in Bromley (BR1, BR2)
Professional side return extension specialists in Bromley, South East London.
Why Choose All Well for Side Return Extensions in Bromley?
Bromley's Victorian terraces have the classic narrow side passage that's perfect for a side return extension. Infilling this space adds 30-40% more width to your ground floor and creates the bright, open-plan kitchen-diner that makes these terraces work for modern families. We've done enough side returns in BR1 and BR2 to know the standard dimensions, steelwork requirements, and foundation depths — which means we can price accurately and build efficiently.
Every project comes with a fixed-price contract, single project manager, and full certification including Building Control sign-off.
Side Return Extensions for Bromley Properties
Bromley is known for its victorian terraces, edwardian semis, 1930s suburban. Our side return extensions services are tailored to these property types, ensuring results that complement the character of your home.
Postcodes we cover: BR1, BR2
Side Return Extensions Tip for Bromley Homeowners
Side return extensions in Bromley typically need a steel beam of 4-6 metres to open up the dividing wall between the kitchen and the new extension. The beam needs to be craned into position, so we confirm vehicle access for a small crane during the site visit. Bromley Council processes side return extensions under permitted development, and we apply for a Lawful Development Certificate as standard. The party wall between your side return and the neighbour's passage may need a party wall agreement — we assess this on site.
Three Bromley side return patterns
Three patterns cover most of what we build in BR1 and BR2. Standard side return infill on a Victorian terrace is the most common. The side passage (typically 0.9-1.2 metres wide and 4-6 metres deep) is infilled with a steel-framed structure, glazed roof (typically a flat skylight or roof lantern), and aluminium or Crittall-style glazing on the new external wall. Combined with knocking through the existing kitchen wall, the result is a wider open-plan kitchen-diner. Cost is £35,000-£55,000 including structural steelwork, foundations on Bromley clay (typically 1.2-1.5 metres), glazing, electrics, plumbing, and finishes. Build time 8-12 weeks. Side return plus rear extension (wraparound) is the second pattern, common on terraces with both a usable side return and deep rear gardens. Combined cost is £55,000-£90,000 depending on the rear extension depth. Build time 12-16 weeks. The wraparound creates a substantial open-plan kitchen-diner of 25-35 square metres. Side return with internal reconfiguration is the third pattern, where the new side return space is combined with knocking through to the existing dining room or living room. The extra step of removing internal walls between the new and existing spaces creates a much larger open-plan ground floor. Cost is £45,000-£70,000. Build time 10-14 weeks. This pattern requires more structural engineering for additional steel beams across former internal walls.
Bromley clay foundations and steelwork
Two structural considerations affect Bromley side returns specifically. Foundations on Bromley clay. The clay subsoil under most of BR1 and BR2 requires foundations of 1.2-1.5 metres for new extensions. Properties near mature trees (oaks around Sundridge Park, Bromley Common, and the larger suburban gardens around Bickley) need deeper foundations of 1.5-2.0 metres or piled foundations to avoid clay shrinkage from tree-root moisture extraction. Tree Preservation Orders are common on the larger Bromley properties and removing trees for an extension is rarely permitted. The structural engineer specifies foundation depth based on a trial hole and tree survey, and the cost is firm before the contract is signed. Steel beam access. Side return extensions need a structural steel beam (typically a 152x152 UC or 203x203 UC section, 4-6 metres long) to open up the dividing wall between the existing kitchen and the new side return space. The beam is heavy (typically 100-200kg) and needs to be craned into position rather than carried by hand. Vehicle access for a small crane is essential — we confirm this during the site visit. Some Bromley terraces have tight rear access via shared passages that don't accommodate crane vehicles, in which case we use a smaller beam in two sections (with a structural connection plate) or hand-carry shorter sections. Both alternatives cost slightly more but solve the access problem. Party walls. The new side return shares a boundary wall with the neighbouring property, which triggers Party Wall Act 1996 requirements. The structural steelwork connection to the party wall and the new wall foundations on the boundary line both fall under the Act. We serve Party Wall Notices on the adjoining owner at least two months before work starts. Surveyor fees are typically £750-£1,500 if the neighbour dissents.
Bromley Council process and standards
Bromley Council is generally efficient with permitted development applications. Side return extensions on terraces typically proceed under permitted development without a full planning application — the standard 3-metre rear projection limit applies, and the new side return doesn't extend any further back than the existing rear wall in most cases. We submit a Lawful Development Certificate (£103, 6-8 weeks at Bromley) for written confirmation, which protects the property at sale time. The Bickley and Shortlands conservation areas have additional design requirements for visible alterations. Side return extensions are usually rear-facing and not visible from the street, so they're typically approved with appropriate materials. Bromley's planning team is consistent in applying conservation area design rules, and we design to the published guidelines from the outset. Glazing is FENSA-registered with thermal performance to U-value 1.2-1.4 W/m²K. Roof glazing typically uses double-glazed flat skylights or roof lanterns from suppliers like Atlas, Lonsdale, or Vitral. Side wall glazing on the new external wall is usually steel-framed Crittall-style or thermally broken aluminium. Electrical work is signed off under BS 7671 by our NICEIC-registered electrician. Building Control inspections happen at foundation, drainage, structure, insulation, and completion stages. Bromley Building Control charges £400-£600 for a side return extension inspection. The completion certificate is delivered at handover. Fixed-price contracts cover labour, materials, structural engineer calculations, FENSA registration, planning fees, Building Control fees, party wall surveyor coordination, and any conservation area applications. The price doesn't change unless the specification does.
Side Return Extensions in Bromley: What's Included
Side Return Extensions Pricing in Bromley
£35,000 – £55,000
8–10 weeks | Fixed-price contracts | No hidden costs
What Our Customers Say
“All Well managed our project from start to finish. The fixed-price contract meant no surprises, and the result is stunning.”
Verified Customer
Bromley
“Professional team, clear communication throughout. They handled everything including Building Control sign-off.”
Verified Customer
Bromley
Frequently Asked Questions
- How much does a Bromley side return extension cost?
- Standard side return infill on a Victorian terrace runs £35,000-£55,000 including structural steelwork, foundations, glazing, electrics, plumbing, and finishes. Side return plus rear extension (wraparound) runs £55,000-£90,000. Side return with internal reconfiguration to combine the new space with the existing dining or living room runs £45,000-£70,000. Properties needing piled foundations near mature trees add £4,000-£10,000. Fixed-price contract after the survey. The price doesn't change unless the specification does.
- Will my Bromley side return need planning permission?
- Usually no, if it stays within permitted development limits. The standard 3-metre rear projection limit applies, and most side returns don't extend any further back than the existing rear wall. Front-facing changes need full planning regardless. The Bickley and Shortlands conservation areas have additional design requirements for visible alterations, but side returns are usually rear-facing and not visible from the street. We submit a Lawful Development Certificate (£103) at Bromley Council for written confirmation. For full planning applications, allow 8-10 weeks at Bromley.
- How does the Party Wall Act apply to my Bromley side return?
- It applies to virtually every side return because the new structure shares a boundary wall with the neighbouring property. The structural steelwork connection to the party wall and the new wall foundations on the boundary line both fall under the Act. Notice must be served on the adjoining owner at least two months before work starts. The neighbour can either consent (in writing, simple) or dissent and appoint a surveyor (more involved). Surveyor fees are typically £750-£1,500 if the neighbour dissents. We serve party wall notices early in every project so the schedule isn't delayed.
- Why hire All Well for a Bromley side return?
- Three reasons. First, accuracy: we know BR1 and BR2 — typical foundation depths on clay subsoil, tree-root proximity issues near Sundridge Park, the steel beam access constraints on tight rear access streets. Second, full accreditation: NICEIC electrical (BS 7671), FENSA glazing, structural engineer calculations, and Building Control sign-off included on every project. Third, fixed-price contracts: the quote doesn't change unless the specification does, including any underpinning required for party wall foundations or piled foundations near mature trees. 57 verified Google reviews averaging 4.5/5. Office on Limes Avenue, SE20.
Side Return Extensions Near Bromley
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