More room, without moving home.

Home Extensions

A well-designed extension does more than add floor area, it rethinks how the whole house works, brings in light, and opens the ground floor to the garden. We design it, get it through planning, and detail it for the build.

Why extend

The space you need is often already within reach.

Moving is expensive and disruptive, and the right house in the right street is hard to find. For most of our clients, extending the home they already love is the better answer, more space, designed exactly around how they live.A good extension isn't just a bigger box on the back. It's a chance to fix the things that never worked: a dark kitchen, a poky hallway, no connection to the garden. That's where design makes the difference.

Done well, it's not just knocking through. It's about light, sightlines and zones that feel distinct without walls, and that's where good design earns its keep.

More usable space

Room for a bigger kitchen, a utility, a downstairs WC or an extra bedroom above.

Light & garden link

Roof lanterns and full-width glazing that connect the house to the outside.

Adds real value

A well-designed extension is one of the strongest investments you can make in a home.

Designed to fit

Proportions, materials and rooflines that sit naturally with the original house.

What we design for

The decisions that shape it.

Every extension is a series of choices. We work through them with you early, so the design, the planning route and the budget all line up before you commit.

Single or double-storey

How much space you need, and whether to add upstairs as well as down, changes everything from cost to planning. We help you weigh it up.

Rear, side or wrap-around

Where the extension goes shapes the whole layout. A wrap-around can transform a cramped ground floor; a side return can unlock a galley kitchen.

Roof form & glazing

Flat, pitched or vaulted; lanterns, rooflights or a glazed gable. The roof is where an extension goes from functional to genuinely lovely.

Planning or permitted development

Many extensions can be built under permitted development; others need full planning. We identify the right route and prepare the application.

Structural Design and Building Regulations

We coordinate steelwork with structural engineers and produce a detailed Building Regs package, so your builder prices and builds from clear information.

Reviews & trust

Homeowners who chose us
and were glad they did.

Most of our work comes through recommendations and reviews. Here's what clients across Essex say about working with NSP Architectural.

Google Review

I hired NSP Architectural to produce drawings and put in planning permission for an upcoming rear extension and they have been nothing short of superb. I was impressed from Nathan's first visit as he was so professional and sought to gain a thorough understanding of the job and gave great advice on how to approach the planning application to achieve what we wanted. The drawings were done in a timely manner and Nathan was more than happy to discuss my queries with a follow up video call. The planning permission went through smoothly and Nathan recommended builders and dealt with the structural engineer to make sure everything was aligned with our plans.

Ashley Simmons
22 days ago
Google Review

We found NSP Architectural after searching for an architect in Essex to help with our home extension, and we are so pleased that we chose them. The NSP Architectural team were friendly and easy to deal with from the start. They really listened to what we wanted, but also came up with ideas for the layout that we had never even thought of ourselves. Now that our extension is complete, we can honestly say it has completely transformed our home and the way we use the space.

Elyssia Yardley
last month
Google Review

I have used Nathan now for a few projects and his service is exceptional. He is very helpful and has always been contactable throughout the whole process, made amendments along the way without any hesitation. Can't recommend him enough, brilliant service.

Ryan Rydquist
last month
Google Review

Absolutely brilliant service from start to finish. The team were professional, creative, and really listened to what we wanted. Their attention to detail and communication throughout the project was excellent, and the final designs exceeded our expectations. Everything was delivered on time and to a very high standard.

Kaden Threadgold
last month
Google Review

High quality experience from quality people! Rare for me to leave reviews but the experience NSP Architectural provided me and my family was second to none. Straightforward and extremely transparent with their works from planning through to providing. They have now made our house feel like home. Credit to the team over there, thank you once again!

Cameron Gibbins
last month
Google Review

I honestly couldn't recommend NSP Architectural more. He handled all the planning work for our house extension from start to finish and made the whole process so much easier than we expected. Everything was done professionally, efficiently, and with great attention to detail. Communication was excellent throughout, and he was always happy to answer questions and offer advice.

Aaron Davis
last month
Google Review

Extremely pleased with how everything turned out. Nathan was professional, friendly, and easy to work with from start to finish. He had great ideas and really knew how to make the most of the space. The design feels practical but still really well thought out, and the whole process felt straightforward and stress-free.

Connor North
last month
Google Review

Really happy with NSP Architectural. Nathan understood exactly what we wanted and came up with a design that's completely transformed the space. Everything was easy, communication was good, and any changes were sorted quickly. They handled the planning too which made it stress-free.

Shay Kiernan
2 months ago
Google Review

Nathan and the team at NSP Architectural were great to work with. They designed our rear kitchen extension in Hornchurch and made the whole process really straightforward. Everything was explained clearly, the drawings were spot on, and it all ran smoothly from planning through to build. They also helped with the party wall side of things and put us in touch with their structural engineer and builder, which made life a lot easier.

Rifat Sikder
3 months ago
Google Review

Nathan and Steve at NSP Architectural consistently provide an exceptional service to both myself and my clients. Their high-end architectural and structural engineering drawings across Essex are delivered to an outstanding standard. Turnaround times are excellent, with drawings often completed in as little as one week and planning approvals achieved within approximately eight weeks.

TCL Construction Ltd
5 months ago
Google Review

Nathan was fantastic to work with. He completed a site visit for our project and produced drawings that were accurate, clear, and exactly what we needed. Everything was delivered in a timely manner, and the whole process was smooth and professional. Highly recommend.

Myles Kumar
6 months ago
Google Review

We recently instructed Nathan from NSP Architectural to carry out an architectural survey and couldn't be more impressed with the service provided. Communication was excellent from start to finish, timelines were met exactly as promised, and the level of detail gave us real confidence in the advice provided. A genuinely excellent service.

Colleen Harris
6 months ago

Start your project

Same house, reimagined.

Tell us about your home and what you're hoping to gain. We'll come back with honest first thoughts, usually within one working day.

Use the cost calculator Takes about a minute, no obligation.

Ready to talk through your project?

Chat on WhatsApp