New-build family home
Northiam Road
Woodside Park, North Finchley N12
Design & build · North London · Est. 2010
Homes designed, built and finished by one North London team.
Extensions, loft and basement conversions, whole-house renovations and new-build houses across Barnet, Harrow and Hertfordshire — under one contract, with a director on site.
Est. 2010
Family-run, father and son directors
Design + build
Feasibility, planning, Building Regulations and construction by one team
Hendon, NW4
Working across North London and south Hertfordshire
Director-led
Stoyan Milkov manages every site personally
Recent work
Three houses, three kinds of project
A new-build house from a bare plot, a 1930s semi extended out and up, and a whole-house refurbishment in Totteridge. All designed and built by us; all photographed as finished.
What we do
Whatever the house needs, from the first sketch to the last coat of paint
Each service page explains what the work involves, what the planning rules allow, what it costs in North London this year and how long it takes.
Why Milkov & Son
Small enough that the director runs the site. Organised enough to run it properly.
Milkov and Son Construction was founded in Hendon in 2010 by Borislav Milkov; his son Stoyan, who studied construction project management at Loughborough, has been a director since 2012 and manages every project. The company has grown by doing the same things well for the same kind of client: North London families making a serious investment in a house they intend to stay in.
About the company- 01
Design and construction, one contract
Our design team draws it, our site team builds it, and one contract covers both. Nobody argues about whose drawing was wrong.
- 02
Priced at feasibility, not at tender
Before planning drawings are commissioned you know what each option is likely to cost, so nothing is designed that cannot be afforded.
- 03
A director on site
Stoyan Milkov trained in construction project management and runs every Milkov & Son site personally. You will know who is turning up on Monday.
- 04
North London, since 2010
Barnet, Harrow, Haringey and Hertsmere planning; 1930s semis, Edwardian villas, Victorian terraces; clay, trees and party walls. We know the ground.
Featured transformation
Arlington Road: out, up and into the garden
- Before
- A 1930s semi with a small kitchen at the back, a separate dining room, a loft full of tanks and a garden that dropped away from the house.
- The challenge
- One big kitchen-dining-living room on the garden, a bedroom and bathroom in the roof, and a house that felt finished — without it looking like a box had been bolted on.
- What we did
- A full-width rear extension wrapped around the retained bay, a rear dormer, a kitchen under a large rooflight, a rendered rear elevation, a raised terrace and steps, and a refurbishment of every room.
- The result
- From the garden the house reads as one composed elevation; inside, kitchen, dining and terrace work as a single room in summer.
How it works
A building project should feel controlled, from the first call to the last snag
Ten stages, each with a defined output. Here are the ones that matter most; the process page has all of them.
- 01
Initial conversation
A call or email about the property, what you want to achieve and roughly what you want to spend.
- 03
Feasibility and budget
Options on paper with indicative costs, so decisions are made before drawings are commissioned.
- 04
Design
Concept and developed design by our design team, working to your budget.
- 05
Planning and approvals
Permitted development checks, planning or prior-approval applications, and lawful development certificates.
- 06
Technical design and pre-construction
Building Regulations drawings, structural calculations, party wall matters and a fixed scope.
- 07
Construction
One site team, one project manager, a weekly update, and no surprises about who is turning up.
- 09
Completion and handover
Snagging, cleaning, a walk-through and the paperwork.
- 10
Aftercare
We come back.
Client feedback
What clients say
“I would like to thank Stoyan and his team at Milkov & Son for the recent work they undertook on our loft conversion. With Milkov and Son there is no messing around on price. The quoted is what we paid, which is often not the case with many builders. Even better, there was no up front deposit to pay. We paid instalments as the work was being completed. What you get is complete transparency.”
Vijay Daswani · Loft conversion
“I would like to take this opportunity to thank you and your team for the recent building work you completed for me. Your work has transformed our home and made our kitchen into a fantastic living space. Your attention to detail was key and the work was kept to the budget that was agreed at the outset.”
Alan Wilkinson · Kitchen extension
Where we work
Based in Hendon, we work across North London and the Hertfordshire border. Each area page explains the local housing, the planning context and the projects we do there.
All areasPlanning a project?
Get a rough idea of what it could cost before you talk to anyone.
Answer a few questions about the project, the property and the finish you want. The calculator applies current North London construction costs and gives you an indicative range — a guide, not a quotation.
Estimate your project
Takes about two minutes. Extensions, lofts, basements, renovations and new builds.
Insights
Read before you build
Costs, planning rules, timelines and the decisions that go wrong most often — written from experience on North London sites.
Extensions
How Much Does a House Extension Cost in London in 2026?
A single-storey extension in London costs £2,800–£4,500 per m² in 2026, so a 25 m² rear extension is typically £70,000–£130,000 before VAT, fees and the kitchen. What moves the number, and what to budget.
3 September 2026 · 8 min read
Extensions
Planning Permission for House Extensions in North London: Permitted Development Explained
Most single-storey extensions on houses in England are permitted development: 3 m or 4 m deep, up to 6 m/8 m with prior approval. What the limits are, when you need an application, and how Barnet, Harrow, Haringey and Hertsmere apply them.
3 September 2026 · 9 min read
Renovations
Full House Renovation Costs in London: A 2026 Guide
A full house renovation in London costs £1,200–£1,800 per m² for mid-range work and £1,800–£2,500+ for high specification in 2026, so a 110 m² three-bed is £130,000–£200,000 plus VAT and fees. What is included, what moves it, and how to budget.
3 September 2026 · 8 min read
Before you enquire
The four questions everyone asks first
More in the full FAQ, or call 07883 074670.
How much does a house extension cost in North London?
As a 2026 market guide, single-storey extensions in North London typically fall between £2,800 and £4,500 per square metre for the shell and basic finish, so a 25 m² rear extension is commonly £75,000 to £115,000 plus VAT, kitchen and professional fees. Site conditions, glazing, structure and specification move the figure considerably; we give a proper estimate after a site visit.
How long does an extension or renovation take?
Design and approvals usually take three to five months before work starts (planning applications alone take eight weeks once validated). On site, a single-storey extension takes around 10 to 16 weeks, a loft conversion 8 to 12 weeks, a whole-house refurbishment three to six months, and a new house nine to fourteen months. We agree a programme before starting.
What size of project do you take on?
Most of our work is in the £50,000 to £500,000 range: single-storey and double-storey extensions, loft and basement conversions, whole-house refurbishments and new-build houses. We do not take on small repair jobs, single-room decorating or kitchen-only replacements unless they are part of a larger project.
What happens after I send an enquiry?
Stoyan reads it and replies within one working day. We then have a short call about the property, brief and budget, and if it is a good fit we arrange a site visit, usually within a week, followed by a written proposal. There is no charge and no obligation for any of this.
Discuss your project
Tell us about your project
Send a few details about the property, what you want to achieve and your approximate budget. Stoyan reads every enquiry and replies within one working day.
What happens next: a short call, a site visit if it is a good fit, then a written proposal. No charge, no obligation.