CUSTOM HOMES

Custom Home Builder on the East End of Long Island

Mark Lumley Builder constructs custom homes in the Hamptons and across the East End — working alongside architects and owners from the earliest stages to ensure that what gets built is exactly what was meant.

Start the conversationStart the conversation

There is nothing standard about a custom home

At this level, every decision matters — and most of the decisions that determine a home’s long-term performance are made before a nail is driven.

Custom isn’t a finish package. It’s a process of continuous, deliberate choices: which materials hold up in a coastal climate, where structure needs to go to support the design, what allowances will actually hold when selections are made. Getting those answers right requires a builder who is engaged from the beginning — not handed a set of plans and told to build.

Why pre-construction is the most important phase

Most challenges on a custom home build don’t start on the job site. They start in the planning phase — in decisions made before the full team was at the table. We change that.

A budget that holds
Pre-construction is where realistic numbers get set and expensive surprises get caught before they’re structural. Not after.

Design to how you live
A builder brought in early works alongside the architect to translate design intent into lived reality — raising the questions that only come from direct experience with materials, methods, and the site. Those details are the difference between a home that fits and one that almost does.

Alignment before ground breaks
When builder, architect, and owner are in the same conversation from the start, decisions move faster, conflicts resolve before they impact the project, and the work stays on track.

“

A custom home begins with pre-construction. Not with the architect, not with the permit — with a builder who’s willing to sit down and do the hard work before anything gets built.”

— Mark Lumley

Your Content Goes Here

The builder, the architect, the owner

The homes we build are the result of a three-way collaboration. Each brings something the others don’t have.

We have worked alongside some of the most respected architecture practices on the East End. We know how to operate within a creative vision without compromising it — and when to push back, clearly and early, when something on paper won’t perform in practice.

Start the conversationStart the conversation

How a custom home in the Hamptons comes together

STEP 1

Introduction

A conversation first. We get to know the project, the client, the architect, and the site — evaluating fit as much as scope.

STEP 2

Pre-construction

Budget pressure-tested. Materials specified. Schedule set realistically. Nothing is rushed to reach a start date.

STEP 3

Design Development

We stay involved as drawings progress. Details that affect buildability or cost are flagged early — when they’re still straightforward to resolve.

STEP 4

construction

Consistent communication. Documented decisions. If something changes — and in a custom home, something always does — the client hears it directly, with a clear explanation and a path forward.