★★★★★5.0 on Google from fewer than 10 reviews
Engineering Design BY — builders in London
Engineering Design BY is an architectural designer and engineer based in Southeast London, providing architectural and engineering design services across South London. The work covers plans and technical drawings, structural design and calculations, planning advice, party wall matters, and design for domestic extensions, loft conversions, flats and maisonettes, change of use and building control.
What Engineering Design BY does — and what it typically costs in London
Every job below can be priced from this page. The ranges are what London homes typically pay, from Locufy's price guides. Engineering Design BY confirms the exact figure in a written quote — asking is free, with no obligation.
Building & extensions
Kitchens, bathrooms & interiors
Roofs, walls & windows
Typical prices from Locufy's UK 2026 price guides — each guide explains what the job involves and what moves the price. Rendering and insulation installer are also offered, priced on survey.
About Engineering Design BY
Engineering Design BY is an architectural designer and engineer based in Southeast London, providing architectural and engineering design services across South London. The work covers plans and technical drawings, structural design and calculations, planning advice, party wall matters, and design for domestic extensions, loft conversions, flats and maisonettes, change of use and building control.
You can ask for a written price on any building job from this page — an extension, a kitchen refit, a roof that leaks — and compare it with other London builders if you want to.
At a glance
- Trade
- Building and construction
- Based
- Thornton Heath
- Covers
- London and 15 km around
- 5.0 · fewer than 10 reviews
- Hours
- Mon–Fri 8:00–19:00, Sat 10:00–16:00
- Quotes
- Written, free, no obligation
- Phone
- Call +44 7886 701813
A written price, with no obligation
Describe the job
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Engineering Design BY prices it
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How Engineering Design BY is rated
As published on Google, refreshed on each visit.
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Have a question before you book?
Do they handle planning? Are they on the voluntary construction register? Ask here — Locufy passes it to them and emails you their answer.
London and the towns around it
Based in London, Engineering Design BY works across the city and about 15 km around it.
- London
- Islington
- City of Westminster
- Sutton
- Croydon
- Fulham
- Purley
- Mitcham
- Beckenham
- Streatham
Before you book
What design services does Engineering Design BY offer?
It offers architectural and engineering design work in South London, including plans and technical drawings, structural design and calculations, planning advice and party wall matters.
Do you work on loft conversions and extensions?
Yes, domestic extensions and loft conversions are covered, as is design work for flats and maisonettes.
How much does a single storey extension cost?
The price guide starts from £350.00 for a single storey extension.
How much does a double storey extension cost?
The price guide starts from £550.00 for a double storey extension.
Do you provide structural calculations?
Yes, structural design and calculations are among the services offered.
Can you advise on planning matters?
Yes, planning advice is offered, based on the company's experience and design knowledge.
Do you handle change of use and building control work?
Yes, both change of use and building control are listed among the services offered.
Get a written price from Engineering Design BY
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