Kitchen Extension Builders in Penge (SE20)
Professional kitchen extension builders in Penge, South East London.
Why Choose All Well for Kitchen Extensions in Penge?
Penge is right next door to our office, and we've built enough kitchen extensions on these Victorian terraces to know every variation by heart. The houses on Penge High Street, Maple Road, and Green Lane all have similar layouts — a narrow kitchen at the back with a separate dining room — and they all transform the same way: knock out the rear wall, extend 3-4 metres, put in bifold doors, and open up the internal wall to create one big room. Simple, effective, and it changes how you live in the house.
Every project comes with a fixed-price contract, single project manager, and full certification including Building Control sign-off.
Kitchen Extensions for Penge Properties
Penge is known for its victorian terraces, edwardian cottages, period properties. Our kitchen extensions services are tailored to these property types, ensuring results that complement the character of your home.
Postcodes we cover: SE20
Kitchen Extensions Tip for Penge Homeowners
Penge properties are under Bromley Council with no conservation restrictions, so permitted development is straightforward. The houses tend to sit on mixed clay and gravel, and foundations go to 1.0-1.3 metres. Being five minutes from our yard means materials can be on site the same morning they're needed, and we can pop over to check on things without it being a half-day trip. That proximity makes a real difference to how smoothly the project runs.
Three Penge kitchen extension patterns
Three patterns cover most of what we build in SE20. Single-storey rear extension on a Victorian terrace is the most common Penge project. The terraces along Penge High Street, Maple Road, Green Lane, and the streets running off Penge Lane have a small dark kitchen at the back of the original layout. We extend 3-4 metres into the rear garden, take out the load-bearing wall between the kitchen and dining room with a slimline steel beam (typically 152x89 UC for the standard 3.5-metre span), and finish with bifolds or a slider across the new rear elevation. Cost is £40,000-£65,000 including foundations, structural steel, glazing, electrics, plumbing, and finishes. Build time 10-14 weeks. Permitted development under Class A covers the standard 3-metre projection. Side return infill on a wider Edwardian cottage is the second pattern, common on the streets near Penge West station where some properties have side returns of 0.9-1.3 metres. The infill creates a wider open-plan kitchen-diner without giving up rear garden space. Cost is £28,000-£48,000 including the steel-framed roof structure, party wall foundations, glazing, and finishes. Build time 8-10 weeks. Party wall agreement with the neighbouring property is required because the side return sits on the shared boundary wall. Wraparound extension on an Edwardian semi is the third pattern, suitable on the larger plots near Cator Park. Combines a rear projection with a side return infill, creating 22-32 square metres of new open-plan space. Cost is £55,000-£85,000. Build time 12-16 weeks. The Edwardian properties typically have cavity walls, which makes new insulation tie-in straightforward — cavity fill achieves U-value 0.18-0.21 W/m²K without losing internal floor area.
Penge structural detail — groundwater, party walls, public sewers
Three Penge factors affect kitchen extension pricing and design. Groundwater on the lower-lying streets. Penge sits at the bottom of the Crystal Palace ridge, and the streets near Penge East and Penge West stations have higher persistent groundwater than properties higher up the slope. This affects foundation design — strip foundations on saturated London Clay need 1.2-1.5 metres minimum to reach stable bearing strata, and the trench may need pumping during pour if water seeps in faster than the concrete can be placed. Trial holes at the survey confirm the water table on each property and the structural engineer specifies the foundation accordingly. Adds £1,500-£3,000 to the foundation cost on the wettest sites compared with a dry equivalent. Party wall mechanics. Penge terraces share 9-inch solid brick party walls with neighbouring properties. Single-storey rear extensions trigger Party Wall Act 1996 requirements where excavation is within 3 metres of neighbour foundations, where new openings are cut for steel beams, or where the new extension ties into the shared wall. Notice must be served at least two months before work starts. We typically use the Agreed Surveyor route (£900-£1,500 single fee) where neighbours dissent rather than each side appointing separately. Thames Water Build Over Agreements. Many Penge terraces sit over public sewers running along the rear of the gardens, particularly the older streets near Penge High Street where the original Victorian sewers haven't been redirected. Where a new extension projects over a public sewer, Thames Water Build Over Agreement is required (£317 fee plus CCTV survey of the existing sewer). The structural design typically includes a reinforced concrete lintel over the sewer to spread loading. We carry out the CCTV survey at the quote stage and handle the application as part of the project.
Bromley Council process and project management
Penge falls under Bromley Council, which is one of the more efficient outer London authorities for extension applications. There is no conservation area covering Penge itself, so permitted development under Class A applies as standard. We submit a Lawful Development Certificate (£103, typically 6-8 weeks at Bromley) on every project for written confirmation of permitted development status — this protects the property at sale and avoids retrospective enforcement risk. Larger projects exceeding the 3-metre limit go through the Larger Home Extension prior approval process or full planning at £206. A Penge kitchen extension involves 12-15 trades over 10-16 weeks: demolition, foundations, drainage, structural steel, brick and block, roofing, glazing, plastering, electrics (NICEIC to BS 7671), plumbing, gas (Gas Safe), kitchen fitting, tiling, flooring, painting. We assign one project manager from survey through handover with photo updates throughout the build. Fixed-price contracts cover labour, materials, structural engineer calculations (£600-£1,200 for the steel and foundation design pack), Building Control fees (£400-£600 at Bromley), FENSA glazing registration, party wall surveyor coordination (Agreed Surveyor route where needed), trial hole investigation, Build Over Agreement where applicable, and the Lawful Development Certificate fee. Building Control inspections happen at foundation, DPC, drainage, structural steel, insulation (Part L: U-value 0.18 W/m²K for new walls and roof), and completion. Glazing is FENSA-registered with thermal performance to U-value 1.4 W/m²K for windows. Bifolds are typically Origin or Schüco aluminium frames; sliders are Sieger or IQ on premium projects. Roof construction is warm-roof with 150mm PIR insulation. Our office on Limes Avenue is 5 minutes from any Penge property — same-day surveys, 48-hour quote turnaround, immediate response if anything needs attention during the build.
Kitchen Extensions in Penge: What's Included
Kitchen Extensions Pricing in Penge
£45,000 – £90,000
10–14 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
Penge
“Professional team, clear communication throughout. They handled everything including Building Control sign-off.”
Verified Customer
Penge
Frequently Asked Questions
- How much does a Penge kitchen extension cost?
- Single-storey rear extensions of 3-4 metres on Victorian terraces (the most common Penge project) run £40,000-£65,000 including foundations, structural steelwork, glazing, electrics, plumbing, and finishes. Side return infill on Edwardian cottages runs £28,000-£48,000. Wraparound extensions on Edwardian semis run £55,000-£85,000. Build Over Agreement with Thames Water adds £317 plus CCTV survey where the extension passes over a public sewer (common on Penge terraces). Party wall surveyor (Agreed Surveyor route) is £900-£1,500 single fee. Foundation work on the wetter lower-lying streets adds £1,500-£3,000 over a dry-site equivalent. Fixed-price contract before any work starts.
- Why does groundwater matter on a Penge extension?
- Because the lower-lying streets sit at the bottom of the Crystal Palace ridge with higher persistent groundwater than the upper slopes. Strip foundations to Building Regulations Part A need to reach stable bearing strata below the active water table — typically 1.2-1.5 metres on saturated London Clay. Where the trial hole shows water seeping in faster than concrete can be placed, the trench needs pumping during pour or short bored piles instead of strip footings. The structural engineer specifies the foundation design from actual trial hole data rather than a generic estimate. Adds £1,500-£3,000 to the foundation cost on the wettest sites. We dig a trial hole at the survey on every Penge project.
- Do I need a Build Over Agreement for a Penge extension?
- Often yes. Many Penge terraces sit over public sewers running along the rear of the gardens, particularly the older streets near Penge High Street. Thames Water requires a Build Over Agreement before any new structure is built over or within 3 metres of a public sewer (£317 fee plus a CCTV survey of the existing sewer). The structural design typically includes a reinforced concrete lintel over the sewer to spread loading and a manhole access point if one isn't already present. We carry out the CCTV survey at the quote stage and handle the application as part of the project. The price is firm before the contract is signed.
- Why hire All Well for a Penge kitchen extension?
- Three reasons. First, location: our office is on Limes Avenue, SE20, 5 minutes from any Penge property. We know which streets have public sewers running along the rear gardens, where groundwater is highest, and which terraces share the same construction. Second, full accreditation: NICEIC for electrical (BS 7671), FENSA for glazing, Gas Safe registered for boiler relocation, structural engineer calculations included, and Building Control sign-off included on every project. Third, fixed-price contracts: the quote doesn't change unless the specification does, including Build Over Agreement, party wall surveyor fees, trial-hole foundation reassessment, and any Larger Home Extension prior approval. 57 verified Google reviews averaging 4.5/5. Office on Limes Avenue, SE20.
Kitchen Extensions Near Penge
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