Extension builders based in Upper Hutt
Upper Hutt sections are often large enough to extend outwards, which is usually the simpler and more affordable option.
Compared with Wellington city, Upper Hutt has generous sections, which is good news if you need more room. A single storey extension across the back of the house is the most common job we build: a bigger living area, a master bedroom with an ensuite, or a family room that opens onto a deck. Where the section is tight or the views are upstairs, a second storey addition makes sense instead.
West Beach Construction is based at Timberlea and run by director Ethan Mansell. We manage the extension from design input through consent, foundations, framing, roofing, cladding and fit-out, so the new part of the house matches the old part and you deal with one team. For the wider region see home extensions in Wellington.
Call Ethan on 022 621 5980
Types of extension we build
Upper Hutt sections are often large enough to extend outwards, which is usually the simpler and more affordable option.
Single storey extensions
Extending out at ground level for a new living area, bedroom or kitchen. The most cost-effective option where the section allows.
Second storey additions
Building up when you cannot build out, or to capture the sun and views. Requires structural engineering, which we coordinate.
Sunrooms and conservatories
A smaller, sun-facing addition that changes how the whole house feels in winter.
Garage and sleepout conversions
Turning existing space into a habitable room, including the insulation, lining and consent that makes it legal to live in.
Where we build extensions
Across Upper Hutt: Timberlea, Totara Park, Maoribank, Brown Owl, Te Marua, Clouston Park, Ebdentown, Elderslea, Wallaceville, Trentham, Heretaunga, Silverstream, Pinehaven and Riverstone Terraces, as well as Lower Hutt and Wellington city.
Consent and planning for an extension
Every extension needs a building consent from Upper Hutt City Council, and the district plan sets rules on site coverage, height and boundary setbacks that decide what can go where. You will need drawings; we can introduce you to a designer we work with or work from your architect's plans. Engineering is needed for beams, second storeys and some foundations. We prepare the builder side of the application, book the inspections and close out the code compliance certificate at the end.
Matching the new to the old
An extension should not look bolted on. We match cladding profiles, roof pitch, window styles and floor levels so the join disappears, and we plan where the new room connects to the existing house so the flow works. On older weatherboard homes that often means sourcing matching profiles and treating the existing wall before we tie into it.
What affects the cost of an extension
Size is the obvious one, but foundations, the amount of structural work at the junction with the existing house, roof complexity, the number of windows and doors, and the level of interior finish all move the number. Second storeys cost more per square metre than ground floor because of the engineering and the work to the existing roof. Our quote breaks these out so you can see the trade-offs.
How an extension runs with West Beach Construction
Site visit and a conversation about what the new space needs to do. Design and consent, which typically takes a couple of months. Then the build: foundations, framing, roof, cladding, joinery, services, linings and finishing, with the house kept weathertight and usable throughout. A walk-through and the consent paperwork at the end. Call Ethan on 022 621 5980 or use the contact form.
"Ethan and the team did an awesome job replacing a rotten bottom plate, and replacing a rotten floor in the basement of my rental property. The quote was very detailed and he solved problems I did not realise I had without asking, like swapping the door opening direction so it does not strike the new floor. Will definitely use West Beach for the next few building jobs."
Homeowner, Hataitai, Wellington - verified Builderscrack review, January 2026
FAQS
Frequently Asked Questions
Design and consent usually take two to three months. The build itself is typically three to five months for a single storey extension and longer for a second storey.
Yes. Adding floor area to a house is never exempt work. We manage the builder side of the consent with Upper Hutt City Council.
Almost always for a single storey extension. For a second storey addition it depends on how much of the existing roof comes off; we plan for that with you.
We work with a designer for the drawings and provide the builder input early so the design is buildable and priced realistically. You can also bring your own architect.
That is the goal. We match cladding, roof, joinery and floor levels so it reads as one house.
Yes. We are based at Timberlea and build extensions across the city.
Ready to talk about your project? West Beach Construction is here to help.
See what our clients say about our service
Planning an extension in Upper Hutt?
Get a local builder involved before the drawings are finished. We will visit, talk through the options and give you a realistic idea of scope and cost.