Extension Builders in Lewisham

Lewisham's Victorian and Edwardian terraces, inter-war semis, and post-war estates are ideal for thoughtful extensions that add genuine living space and property value. If you're planning a rear extension in Blackheath, a kitchen diner in Catford, or a loft conversion near the Lewisham Centre, you need an extension builder who understands the local conservation area rules, the typical property layouts across SE13 and SE6, and how to navigate Lewisham Council's planning requirements. Finding the right builder means getting someone who's worked on similar homes in your area—someone who knows the difference between the original stock in Lee and Forest Hill, and has experience with the listed buildings scattered throughout the borough. We connect homeowners with local extension builders ready to transform your property, and help builders in Lewisham manage their growing projects with specialist tools built for the construction industry.

Extension Builder Services in Lewisham — What BizHub365 Helps You Manage

Single and double storey extensions

Rear and side extensions with planning

Kitchen diner extensions and conversions

Structural design and building control approval

Loft conversion planning and installation

Period property extensions for Victorian homes

Running a Extension Builder Business in Lewisham

Lewisham's mixed housing stock—Victorian terraces in Catford, inter-war semis around Blackheath, post-war estates near Deptford—creates steady demand for extension builders. Many properties lack space, pushing families toward rear extensions rather than moving. Neighbouring Brockley, Sydenham, and Penge all feed work into the area. The conservation-conscious Blackheath boundary means planners scrutinise period-appropriate designs, raising project complexity and value.

Frequently Asked Questions

How much does a single-storey extension cost in Lewisham?

A rear extension on a Lewisham terraced house typically costs £25,000–£45,000 depending on size, materials, and whether you need Party Wall Act agreements. Blackheath conservation rules may add surveyor fees.

How long does an extension take to build in Lewisham?

Single-storey extensions usually take 12–20 weeks from Planning approval to completion. Lewisham's Building Control are fairly responsive, but conservation area applications add 2–4 weeks to the planning phase.

Is an extension builder in Lewisham VAT registered?

Most extension builders registering above the VAT threshold are registered. Always ask—it affects your quote. Many sole traders in Lewisham sit just below the limit and charge gross prices.

Do I need Building Regulations approval for a Lewisham extension?

Yes. Any extension needs Building Regulations sign-off. Conservation area status (around Blackheath, Catford, and parts of Sydenham) also triggers separate planning consent. A qualified builder knows the local process.

Not ready to sign up? Get free tips for running your extension builder business

We'll send you useful insights for extension builder businesses — invoicing, HMRC tips, and tools to help you grow.

Manage Lewisham projects from your phone

BizHub365 keeps your quotes, job costings, and invoices synced across the Lewisham patch. Track materials, capture receipts on-site, and stay Building Regulations-ready. Start your free trial today.

Are you a Extension Builder?

Run your extension builder business on BizHub365

Invoicing, expenses, HMRC compliance, quoting and more — everything a extension builder business needs, in one platform.

Start Free Trial

No card required to start

Why Extension Builders Choose BizHub365

Running your extension building business in Lewisham means juggling quotes across south London, managing labour costs on Victorian terraces and new-build estates, and staying on top of Building Regulations approvals. BizHub365 handles your invoicing with automatic VAT and CIS deductions, tracks materials against job costings, and keeps your expenses HMRC-compliant through the tax year. When self-assessment arrives, you've got quarterly profit-and-loss data ready. More time on site, less time chasing paperwork.

Platform Features

Create & send professional invoices
Track expenses and receipts
HMRC MTD VAT compliance
Manage quotes and jobs
Customer CRM and bookings
Payroll and employee management
AI-powered business assistant
From £29/month — no setup fee

How Much Does a Extension Builder Cost?

See typical price ranges for extension builder services in Lewisham, including what affects the final cost.

View Lewisham Pricing Guide

Extension Builders in Other Areas

View All Locations